diff options
Diffstat (limited to 'security')
30 files changed, 702 insertions, 192 deletions
diff --git a/security/apparmor/crypto.c b/security/apparmor/crypto.c index de8dc78b61442..136f2a0478367 100644 --- a/security/apparmor/crypto.c +++ b/security/apparmor/crypto.c @@ -31,10 +31,7 @@ unsigned int aa_hash_size(void) char *aa_calc_hash(void *data, size_t len) { - struct { - struct shash_desc shash; - char ctx[crypto_shash_descsize(apparmor_tfm)]; - } desc; + SHASH_DESC_ON_STACK(desc, apparmor_tfm); char *hash = NULL; int error = -ENOMEM; @@ -45,16 +42,16 @@ char *aa_calc_hash(void *data, size_t len) if (!hash) goto fail; - desc.shash.tfm = apparmor_tfm; - desc.shash.flags = 0; + desc->tfm = apparmor_tfm; + desc->flags = 0; - error = crypto_shash_init(&desc.shash); + error = crypto_shash_init(desc); if (error) goto fail; - error = crypto_shash_update(&desc.shash, (u8 *) data, len); + error = crypto_shash_update(desc, (u8 *) data, len); if (error) goto fail; - error = crypto_shash_final(&desc.shash, hash); + error = crypto_shash_final(desc, hash); if (error) goto fail; @@ -69,10 +66,7 @@ fail: int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start, size_t len) { - struct { - struct shash_desc shash; - char ctx[crypto_shash_descsize(apparmor_tfm)]; - } desc; + SHASH_DESC_ON_STACK(desc, apparmor_tfm); int error = -ENOMEM; __le32 le32_version = cpu_to_le32(version); @@ -86,19 +80,19 @@ int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start, if (!profile->hash) goto fail; - desc.shash.tfm = apparmor_tfm; - desc.shash.flags = 0; + desc->tfm = apparmor_tfm; + desc->flags = 0; - error = crypto_shash_init(&desc.shash); + error = crypto_shash_init(desc); if (error) goto fail; - error = crypto_shash_update(&desc.shash, (u8 *) &le32_version, 4); + error = crypto_shash_update(desc, (u8 *) &le32_version, 4); if (error) goto fail; - error = crypto_shash_update(&desc.shash, (u8 *) start, len); + error = crypto_shash_update(desc, (u8 *) start, len); if (error) goto fail; - error = crypto_shash_final(&desc.shash, profile->hash); + error = crypto_shash_final(desc, profile->hash); if (error) goto fail; diff --git a/security/apparmor/include/lib.h b/security/apparmor/include/lib.h index 65ff492a98079..0291ff3902f90 100644 --- a/security/apparmor/include/lib.h +++ b/security/apparmor/include/lib.h @@ -57,7 +57,7 @@ pr_err_ratelimited("AppArmor: " fmt, ##args) /* Flag indicating whether initialization completed */ -extern int apparmor_initialized __initdata; +extern int apparmor_initialized; /* fn's in lib */ char *aa_split_fqname(char *args, char **ns_name); diff --git a/security/apparmor/lib.c b/security/apparmor/lib.c index 66475bda6f722..32cafc12593ef 100644 --- a/security/apparmor/lib.c +++ b/security/apparmor/lib.c @@ -180,13 +180,13 @@ bool aa_policy_init(struct aa_policy *policy, const char *prefix, } else policy->hname = kstrdup(name, gfp); if (!policy->hname) - return 0; + return false; /* base.name is a substring of fqname */ policy->name = basename(policy->hname); INIT_LIST_HEAD(&policy->list); INIT_LIST_HEAD(&policy->profiles); - return 1; + return true; } /** diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index e287b691a30e4..8f3c0f7aca5a2 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -39,7 +39,7 @@ #include "include/procattr.h" /* Flag indicating whether initialization completed */ -int apparmor_initialized __initdata; +int apparmor_initialized; DEFINE_PER_CPU(struct aa_buffers, aa_buffers); @@ -681,7 +681,7 @@ module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); #endif /* Debug mode */ -bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_DEBUG_MESSAGES); +bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); /* Audit mode */ @@ -710,7 +710,7 @@ module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); /* Maximum pathname length before accesses will start getting rejected */ unsigned int aa_g_path_max = 2 * PATH_MAX; -module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR); +module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); /* Determines how paranoid loading of policy is and how much verification * on the loaded policy is done. @@ -738,78 +738,77 @@ __setup("apparmor=", apparmor_enabled_setup); /* set global flag turning off the ability to load policy */ static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) { - if (!policy_admin_capable(NULL)) + if (!apparmor_enabled) + return -EINVAL; + if (apparmor_initialized && !policy_admin_capable(NULL)) return -EPERM; return param_set_bool(val, kp); } static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) { - if (!policy_view_capable(NULL)) - return -EPERM; if (!apparmor_enabled) return -EINVAL; + if (apparmor_initialized && !policy_view_capable(NULL)) + return -EPERM; return param_get_bool(buffer, kp); } static int param_set_aabool(const char *val, const struct kernel_param *kp) { - if (!policy_admin_capable(NULL)) - return -EPERM; if (!apparmor_enabled) return -EINVAL; + if (apparmor_initialized && !policy_admin_capable(NULL)) + return -EPERM; return param_set_bool(val, kp); } static int param_get_aabool(char *buffer, const struct kernel_param *kp) { - if (!policy_view_capable(NULL)) - return -EPERM; if (!apparmor_enabled) return -EINVAL; + if (apparmor_initialized && !policy_view_capable(NULL)) + return -EPERM; return param_get_bool(buffer, kp); } static int param_set_aauint(const char *val, const struct kernel_param *kp) { - if (!policy_admin_capable(NULL)) - return -EPERM; if (!apparmor_enabled) return -EINVAL; + if (apparmor_initialized && !policy_admin_capable(NULL)) + return -EPERM; return param_set_uint(val, kp); } static int param_get_aauint(char *buffer, const struct kernel_param *kp) { - if (!policy_view_capable(NULL)) - return -EPERM; if (!apparmor_enabled) return -EINVAL; + if (apparmor_initialized && !policy_view_capable(NULL)) + return -EPERM; return param_get_uint(buffer, kp); } static int param_get_audit(char *buffer, struct kernel_param *kp) { - if (!policy_view_capable(NULL)) - return -EPERM; - if (!apparmor_enabled) return -EINVAL; - + if (apparmor_initialized && !policy_view_capable(NULL)) + return -EPERM; return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); } static int param_set_audit(const char *val, struct kernel_param *kp) { int i; - if (!policy_admin_capable(NULL)) - return -EPERM; if (!apparmor_enabled) return -EINVAL; - if (!val) return -EINVAL; + if (apparmor_initialized && !policy_admin_capable(NULL)) + return -EPERM; for (i = 0; i < AUDIT_MAX_INDEX; i++) { if (strcmp(val, audit_mode_names[i]) == 0) { @@ -823,11 +822,10 @@ static int param_set_audit(const char *val, struct kernel_param *kp) static int param_get_mode(char *buffer, struct kernel_param *kp) { - if (!policy_view_capable(NULL)) - return -EPERM; - if (!apparmor_enabled) return -EINVAL; + if (apparmor_initialized && !policy_view_capable(NULL)) + return -EPERM; return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); } @@ -835,14 +833,13 @@ static int param_get_mode(char *buffer, struct kernel_param *kp) static int param_set_mode(const char *val, struct kernel_param *kp) { int i; - if (!policy_admin_capable(NULL)) - return -EPERM; if (!apparmor_enabled) return -EINVAL; - if (!val) return -EINVAL; + if (apparmor_initialized && !policy_admin_capable(NULL)) + return -EPERM; for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { if (strcmp(val, aa_profile_mode_names[i]) == 0) { diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c index def1fbd6bdfd8..cf9d670dca945 100644 --- a/security/apparmor/policy.c +++ b/security/apparmor/policy.c @@ -876,9 +876,11 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile, if (ns_name) { ns = aa_prepare_ns(view, ns_name); if (IS_ERR(ns)) { + op = OP_PROF_LOAD; info = "failed to prepare namespace"; error = PTR_ERR(ns); ns = NULL; + ent = NULL; goto fail; } } else @@ -1013,7 +1015,7 @@ fail_lock: /* audit cause of failure */ op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; fail: - audit_policy(profile, op, ns_name, ent->new->base.hname, + audit_policy(profile, op, ns_name, ent ? ent->new->base.hname : NULL, info, error); /* audit status that rest of profiles in the atomic set failed too */ info = "valid profile in failed atomic policy load"; @@ -1023,7 +1025,7 @@ fail: /* skip entry that caused failure */ continue; } - op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; + op = (!tmp->old) ? OP_PROF_LOAD : OP_PROF_REPL; audit_policy(profile, op, ns_name, tmp->new->base.hname, info, error); } diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index 106e855e2d9d1..06554c448dce8 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -81,18 +81,25 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, int __init integrity_init_keyring(const unsigned int id) { const struct cred *cred = current_cred(); + struct key_restriction *restriction; int err = 0; if (!init_keyring) return 0; + restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); + if (!restriction) + return -ENOMEM; + + restriction->check = restrict_link_to_ima; + keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0), KGIDT_INIT(0), cred, ((KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_WRITE | KEY_USR_SEARCH), KEY_ALLOC_NOT_IN_QUOTA, - restrict_link_to_ima, NULL); + restriction, NULL); if (IS_ERR(keyring[id])) { err = PTR_ERR(keyring[id]); pr_info("Can't allocate %s keyring (%d)\n", diff --git a/security/integrity/ima/ima_mok.c b/security/integrity/ima/ima_mok.c index 74a2799574642..073ddc9bce5ba 100644 --- a/security/integrity/ima/ima_mok.c +++ b/security/integrity/ima/ima_mok.c @@ -17,6 +17,7 @@ #include <linux/cred.h> #include <linux/err.h> #include <linux/init.h> +#include <linux/slab.h> #include <keys/system_keyring.h> @@ -27,15 +28,23 @@ struct key *ima_blacklist_keyring; */ __init int ima_mok_init(void) { + struct key_restriction *restriction; + pr_notice("Allocating IMA blacklist keyring.\n"); + restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); + if (!restriction) + panic("Can't allocate IMA blacklist restriction."); + + restriction->check = restrict_link_by_builtin_trusted; + ima_blacklist_keyring = keyring_alloc(".ima_blacklist", KUIDT_INIT(0), KGIDT_INIT(0), current_cred(), (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_WRITE | KEY_USR_SEARCH, KEY_ALLOC_NOT_IN_QUOTA, - restrict_link_by_builtin_trusted, NULL); + restriction, NULL); if (IS_ERR(ima_blacklist_keyring)) panic("Can't allocate IMA blacklist keyring."); diff --git a/security/keys/Kconfig b/security/keys/Kconfig index d942c7c2bc0aa..6fd95f76bfaea 100644 --- a/security/keys/Kconfig +++ b/security/keys/Kconfig @@ -90,6 +90,8 @@ config KEY_DH_OPERATIONS bool "Diffie-Hellman operations on retained keys" depends on KEYS select MPILIB + select CRYPTO + select CRYPTO_HASH help This option provides support for calculating Diffie-Hellman public keys and shared secrets using values stored as keys diff --git a/security/keys/Makefile b/security/keys/Makefile index 1fd4a16e6dafb..57dff0c158090 100644 --- a/security/keys/Makefile +++ b/security/keys/Makefile @@ -15,7 +15,8 @@ obj-y := \ request_key.o \ request_key_auth.o \ user_defined.o -obj-$(CONFIG_KEYS_COMPAT) += compat.o +compat-obj-$(CONFIG_KEY_DH_OPERATIONS) += compat_dh.o +obj-$(CONFIG_KEYS_COMPAT) += compat.o $(compat-obj-y) obj-$(CONFIG_PROC_FS) += proc.o obj-$(CONFIG_SYSCTL) += sysctl.o obj-$(CONFIG_PERSISTENT_KEYRINGS) += persistent.o diff --git a/security/keys/compat.c b/security/keys/compat.c index 36c80bf5b89c6..e87c89c0177c1 100644 --- a/security/keys/compat.c +++ b/security/keys/compat.c @@ -133,8 +133,13 @@ COMPAT_SYSCALL_DEFINE5(keyctl, u32, option, return keyctl_get_persistent(arg2, arg3); case KEYCTL_DH_COMPUTE: - return keyctl_dh_compute(compat_ptr(arg2), compat_ptr(arg3), - arg4, compat_ptr(arg5)); + return compat_keyctl_dh_compute(compat_ptr(arg2), + compat_ptr(arg3), + arg4, compat_ptr(arg5)); + + case KEYCTL_RESTRICT_KEYRING: + return keyctl_restrict_keyring(arg2, compat_ptr(arg3), + compat_ptr(arg4)); default: return -EOPNOTSUPP; diff --git a/security/keys/compat_dh.c b/security/keys/compat_dh.c new file mode 100644 index 0000000000000..a6a659b6bcb6d --- /dev/null +++ b/security/keys/compat_dh.c @@ -0,0 +1,38 @@ +/* 32-bit compatibility syscall for 64-bit systems for DH operations + * + * Copyright (C) 2016 Stephan Mueller <smueller@chronox.de> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/uaccess.h> + +#include "internal.h" + +/* + * Perform the DH computation or DH based key derivation. + * + * If successful, 0 will be returned. + */ +long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params, + char __user *buffer, size_t buflen, + struct compat_keyctl_kdf_params __user *kdf) +{ + struct keyctl_kdf_params kdfcopy; + struct compat_keyctl_kdf_params compat_kdfcopy; + + if (!kdf) + return __keyctl_dh_compute(params, buffer, buflen, NULL); + + if (copy_from_user(&compat_kdfcopy, kdf, sizeof(compat_kdfcopy)) != 0) + return -EFAULT; + + kdfcopy.hashname = compat_ptr(compat_kdfcopy.hashname); + kdfcopy.otherinfo = compat_ptr(compat_kdfcopy.otherinfo); + kdfcopy.otherinfolen = compat_kdfcopy.otherinfolen; + + return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy); +} diff --git a/security/keys/dh.c b/security/keys/dh.c index 893af4c450382..e603bd912e4c2 100644 --- a/security/keys/dh.c +++ b/security/keys/dh.c @@ -11,6 +11,8 @@ #include <linux/mpi.h> #include <linux/slab.h> #include <linux/uaccess.h> +#include <linux/crypto.h> +#include <crypto/hash.h> #include <keys/user-type.h> #include "internal.h" @@ -77,9 +79,146 @@ error: return ret; } -long keyctl_dh_compute(struct keyctl_dh_params __user *params, - char __user *buffer, size_t buflen, - void __user *reserved) +struct kdf_sdesc { + struct shash_desc shash; + char ctx[]; +}; + +static int kdf_alloc(struct kdf_sdesc **sdesc_ret, char *hashname) +{ + struct crypto_shash *tfm; + struct kdf_sdesc *sdesc; + int size; + + /* allocate synchronous hash */ + tfm = crypto_alloc_shash(hashname, 0, 0); + if (IS_ERR(tfm)) { + pr_info("could not allocate digest TFM handle %s\n", hashname); + return PTR_ERR(tfm); + } + + size = sizeof(struct shash_desc) + crypto_shash_descsize(tfm); + sdesc = kmalloc(size, GFP_KERNEL); + if (!sdesc) + return -ENOMEM; + sdesc->shash.tfm = tfm; + sdesc->shash.flags = 0x0; + + *sdesc_ret = sdesc; + + return 0; +} + +static void kdf_dealloc(struct kdf_sdesc *sdesc) +{ + if (!sdesc) + return; + + if (sdesc->shash.tfm) + crypto_free_shash(sdesc->shash.tfm); + + kzfree(sdesc); +} + +/* convert 32 bit integer into its string representation */ +static inline void crypto_kw_cpu_to_be32(u32 val, u8 *buf) +{ + __be32 *a = (__be32 *)buf; + + *a = cpu_to_be32(val); +} + +/* + * Implementation of the KDF in counter mode according to SP800-108 section 5.1 + * as well as SP800-56A section 5.8.1 (Single-step KDF). + * + * SP800-56A: + * The src pointer is defined as Z || other info where Z is the shared secret + * from DH and other info is an arbitrary string (see SP800-56A section + * 5.8.1.2). + */ +static int kdf_ctr(struct kdf_sdesc *sdesc, const u8 *src, unsigned int slen, + u8 *dst, unsigned int dlen) +{ + struct shash_desc *desc = &sdesc->shash; + unsigned int h = crypto_shash_digestsize(desc->tfm); + int err = 0; + u8 *dst_orig = dst; + u32 i = 1; + u8 iteration[sizeof(u32)]; + + while (dlen) { + err = crypto_shash_init(desc); + if (err) + goto err; + + crypto_kw_cpu_to_be32(i, iteration); + err = crypto_shash_update(desc, iteration, sizeof(u32)); + if (err) + goto err; + + if (src && slen) { + err = crypto_shash_update(desc, src, slen); + if (err) + goto err; + } + + if (dlen < h) { + u8 tmpbuffer[h]; + + err = crypto_shash_final(desc, tmpbuffer); + if (err) + goto err; + memcpy(dst, tmpbuffer, dlen); + memzero_explicit(tmpbuffer, h); + return 0; + } else { + err = crypto_shash_final(desc, dst); + if (err) + goto err; + + dlen -= h; + dst += h; + i++; + } + } + + return 0; + +err: + memzero_explicit(dst_orig, dlen); + return err; +} + +static int keyctl_dh_compute_kdf(struct kdf_sdesc *sdesc, + char __user *buffer, size_t buflen, + uint8_t *kbuf, size_t kbuflen) +{ + uint8_t *outbuf = NULL; + int ret; + + outbuf = kmalloc(buflen, GFP_KERNEL); + if (!outbuf) { + ret = -ENOMEM; + goto err; + } + + ret = kdf_ctr(sdesc, kbuf, kbuflen, outbuf, buflen); + if (ret) + goto err; + + ret = buflen; + if (copy_to_user(buffer, outbuf, buflen) != 0) + ret = -EFAULT; + +err: + kzfree(outbuf); + return ret; +} + +long __keyctl_dh_compute(struct keyctl_dh_params __user *params, + char __user *buffer, size_t buflen, + struct keyctl_kdf_params *kdfcopy) { long ret; MPI base, private, prime, result; @@ -88,6 +227,7 @@ long keyctl_dh_compute(struct keyctl_dh_params __user *params, uint8_t *kbuf; ssize_t keylen; size_t resultlen; + struct kdf_sdesc *sdesc = NULL; if (!params || (!buffer && buflen)) { ret = -EINVAL; @@ -98,12 +238,34 @@ long keyctl_dh_compute(struct keyctl_dh_params __user *params, goto out; } - if (reserved) { - ret = -EINVAL; - goto out; + if (kdfcopy) { + char *hashname; + + if (buflen > KEYCTL_KDF_MAX_OUTPUT_LEN || + kdfcopy->otherinfolen > KEYCTL_KDF_MAX_OI_LEN) { + ret = -EMSGSIZE; + goto out; + } + + /* get KDF name string */ + hashname = strndup_user(kdfcopy->hashname, CRYPTO_MAX_ALG_NAME); + if (IS_ERR(hashname)) { + ret = PTR_ERR(hashname); + goto out; + } + + /* allocate KDF from the kernel crypto API */ + ret = kdf_alloc(&sdesc, hashname); + kfree(hashname); + if (ret) + goto out; } - keylen = mpi_from_key(pcopy.prime, buflen, &prime); + /* + * If the caller requests postprocessing with a KDF, allow an + * arbitrary output buffer size since the KDF ensures proper truncation. + */ + keylen = mpi_from_key(pcopy.prime, kdfcopy ? SIZE_MAX : buflen, &prime); if (keylen < 0 || !prime) { /* buflen == 0 may be used to query the required buffer size, * which is the prime key length. @@ -133,12 +295,25 @@ long keyctl_dh_compute(struct keyctl_dh_params __user *params, goto error3; } - kbuf = kmalloc(resultlen, GFP_KERNEL); + /* allocate space for DH shared secret and SP800-56A otherinfo */ + kbuf = kmalloc(kdfcopy ? (resultlen + kdfcopy->otherinfolen) : resultlen, + GFP_KERNEL); if (!kbuf) { ret = -ENOMEM; goto error4; } + /* + * Concatenate SP800-56A otherinfo past DH shared secret -- the + * input to the KDF is (DH shared secret || otherinfo) + */ + if (kdfcopy && kdfcopy->otherinfo && + copy_from_user(kbuf + resultlen, kdfcopy->otherinfo, + kdfcopy->otherinfolen) != 0) { + ret = -EFAULT; + goto error5; + } + ret = do_dh(result, base, private, prime); if (ret) goto error5; @@ -147,12 +322,17 @@ long keyctl_dh_compute(struct keyctl_dh_params __user *params, if (ret != 0) goto error5; - ret = nbytes; - if (copy_to_user(buffer, kbuf, nbytes) != 0) - ret = -EFAULT; + if (kdfcopy) { + ret = keyctl_dh_compute_kdf(sdesc, buffer, buflen, kbuf, + resultlen + kdfcopy->otherinfolen); + } else { + ret = nbytes; + if (copy_to_user(buffer, kbuf, nbytes) != 0) + ret = -EFAULT; + } error5: - kfree(kbuf); + kzfree(kbuf); error4: mpi_free(result); error3: @@ -162,5 +342,21 @@ error2: error1: mpi_free(prime); out: + kdf_dealloc(sdesc); return ret; } + +long keyctl_dh_compute(struct keyctl_dh_params __user *params, + char __user *buffer, size_t buflen, + struct keyctl_kdf_params __user *kdf) +{ + struct keyctl_kdf_params kdfcopy; + + if (!kdf) + return __keyctl_dh_compute(params, buffer, buflen, NULL); + + if (copy_from_user(&kdfcopy, kdf, sizeof(kdfcopy)) != 0) + return -EFAULT; + + return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy); +} diff --git a/security/keys/gc.c b/security/keys/gc.c index addf060399e09..15b9ddf510e4e 100644 --- a/security/keys/gc.c +++ b/security/keys/gc.c @@ -220,7 +220,7 @@ continue_scanning: key = rb_entry(cursor, struct key, serial_node); cursor = rb_next(cursor); - if (atomic_read(&key->usage) == 0) + if (refcount_read(&key->usage) == 0) goto found_unreferenced_key; if (unlikely(gc_state & KEY_GC_REAPING_DEAD_1)) { @@ -229,6 +229,9 @@ continue_scanning: set_bit(KEY_FLAG_DEAD, &key->flags); key->perm = 0; goto skip_dead_key; + } else if (key->type == &key_type_keyring && + key->restrict_link) { + goto found_restricted_keyring; } } @@ -334,6 +337,14 @@ found_unreferenced_key: gc_state |= KEY_GC_REAP_AGAIN; goto maybe_resched; + /* We found a restricted keyring and need to update the restriction if + * it is associated with the dead key type. + */ +found_restricted_keyring: + spin_unlock(&key_serial_lock); + keyring_restriction_gc(key, key_gc_dead_keytype); + goto maybe_resched; + /* We found a keyring and we need to check the payload for links to * dead or expired keys. We don't flag another reap immediately as we * have to wait for the old payload to be destroyed by RCU before we diff --git a/security/keys/internal.h b/security/keys/internal.h index a2f4c0abb8d84..c0f8682eba69a 100644 --- a/security/keys/internal.h +++ b/security/keys/internal.h @@ -17,6 +17,8 @@ #include <linux/key-type.h> #include <linux/task_work.h> #include <linux/keyctl.h> +#include <linux/refcount.h> +#include <linux/compat.h> struct iovec; @@ -53,7 +55,7 @@ struct key_user { struct rb_node node; struct mutex cons_lock; /* construction initiation lock */ spinlock_t lock; - atomic_t usage; /* for accessing qnkeys & qnbytes */ + refcount_t usage; /* for accessing qnkeys & qnbytes */ atomic_t nkeys; /* number of keys */ atomic_t nikeys; /* number of instantiated keys */ kuid_t uid; @@ -167,6 +169,8 @@ extern void key_change_session_keyring(struct callback_head *twork); extern struct work_struct key_gc_work; extern unsigned key_gc_delay; extern void keyring_gc(struct key *keyring, time_t limit); +extern void keyring_restriction_gc(struct key *keyring, + struct key_type *dead_type); extern void key_schedule_gc(time_t gc_at); extern void key_schedule_gc_links(void); extern void key_gc_keytype(struct key_type *ktype); @@ -249,6 +253,9 @@ struct iov_iter; extern long keyctl_instantiate_key_common(key_serial_t, struct iov_iter *, key_serial_t); +extern long keyctl_restrict_keyring(key_serial_t id, + const char __user *_type, + const char __user *_restriction); #ifdef CONFIG_PERSISTENT_KEYRINGS extern long keyctl_get_persistent(uid_t, key_serial_t); extern unsigned persistent_keyring_expiry; @@ -261,15 +268,34 @@ static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring) #ifdef CONFIG_KEY_DH_OPERATIONS extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *, - size_t, void __user *); + size_t, struct keyctl_kdf_params __user *); +extern long __keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *, + size_t, struct keyctl_kdf_params *); +#ifdef CONFIG_KEYS_COMPAT +extern long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params, + char __user *buffer, size_t buflen, + struct compat_keyctl_kdf_params __user *kdf); +#endif +#define KEYCTL_KDF_MAX_OUTPUT_LEN 1024 /* max length of KDF output */ +#define KEYCTL_KDF_MAX_OI_LEN 64 /* max length of otherinfo */ #else static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params, char __user *buffer, size_t buflen, - void __user *reserved) + struct keyctl_kdf_params __user *kdf) +{ + return -EOPNOTSUPP; +} + +#ifdef CONFIG_KEYS_COMPAT +static inline long compat_keyctl_dh_compute( + struct keyctl_dh_params __user *params, + char __user *buffer, size_t buflen, + struct keyctl_kdf_params __user *kdf) { return -EOPNOTSUPP; } #endif +#endif /* * Debugging key validation diff --git a/security/keys/key.c b/security/keys/key.c index 346fbf201c22e..455c04d80bbbf 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -93,7 +93,7 @@ try_again: /* if we get here, then the user record still hadn't appeared on the * second pass - so we use the candidate record */ - atomic_set(&candidate->usage, 1); + refcount_set(&candidate->usage, 1); atomic_set(&candidate->nkeys, 0); atomic_set(&candidate->nikeys, 0); candidate->uid = uid; @@ -110,7 +110,7 @@ try_again: /* okay - we found a user record for this UID */ found: - atomic_inc(&user->usage); + refcount_inc(&user->usage); spin_unlock(&key_user_lock); kfree(candidate); out: @@ -122,7 +122,7 @@ out: */ void key_user_put(struct key_user *user) { - if (atomic_dec_and_lock(&user->usage, &key_user_lock)) { + if (refcount_dec_and_lock(&user->usage, &key_user_lock)) { rb_erase(&user->node, &key_user_tree); spin_unlock(&key_user_lock); @@ -201,12 +201,15 @@ serial_exists: * @cred: The credentials specifying UID namespace. * @perm: The permissions mask of the new key. * @flags: Flags specifying quota properties. - * @restrict_link: Optional link restriction method for new keyrings. + * @restrict_link: Optional link restriction for new keyrings. * * Allocate a key of the specified type with the attributes given. The key is * returned in an uninstantiated state and the caller needs to instantiate the * key before returning. * + * The restrict_link structure (if not NULL) will be freed when the + * keyring is destroyed, so it must be dynamically allocated. + * * The user's key count quota is updated to reflect the creation of the key and * the user's key data quota has the default for the key type reserved. The * instantiation function should amend this as necessary. If insufficient @@ -225,9 +228,7 @@ serial_exists: struct key *key_alloc(struct key_type *type, const char *desc, kuid_t uid, kgid_t gid, const struct cred *cred, key_perm_t perm, unsigned long flags, - int (*restrict_link)(struct key *, - const struct key_type *, - const union key_payload *)) + struct key_restriction *restrict_link) { struct key_user *user = NULL; struct key *key; @@ -285,7 +286,7 @@ struct key *key_alloc(struct key_type *type, const char *desc, if (!key->index_key.description) goto no_memory_3; - atomic_set(&key->usage, 1); + refcount_set(&key->usage, 1); init_rwsem(&key->sem); lockdep_set_class(&key->sem, &type->lock_class); key->index_key.type = type; @@ -499,19 +500,23 @@ int key_instantiate_and_link(struct key *key, } if (keyring) { - if (keyring->restrict_link) { - ret = keyring->restrict_link(keyring, key->type, - &prep.payload); - if (ret < 0) - goto error; - } ret = __key_link_begin(keyring, &key->index_key, &edit); if (ret < 0) goto error; + + if (keyring->restrict_link && keyring->restrict_link->check) { + struct key_restriction *keyres = keyring->restrict_link; + + ret = keyres->check(keyring, key->type, &prep.payload, + keyres->key); + if (ret < 0) + goto error_link_end; + } } ret = __key_instantiate_and_link(key, &prep, keyring, authkey, &edit); +error_link_end: if (keyring) __key_link_end(keyring, &key->index_key, edit); @@ -621,7 +626,7 @@ void key_put(struct key *key) if (key) { key_check(key); - if (atomic_dec_and_test(&key->usage)) + if (refcount_dec_and_test(&key->usage)) schedule_work(&key_gc_work); } } @@ -656,7 +661,7 @@ not_found: found: /* pretend it doesn't exist if it is awaiting deletion */ - if (atomic_read(&key->usage) == 0) + if (refcount_read(&key->usage) == 0) goto not_found; /* this races with key_put(), but that doesn't matter since key_put() @@ -806,9 +811,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref, struct key *keyring, *key = NULL; key_ref_t key_ref; int ret; - int (*restrict_link)(struct key *, - const struct key_type *, - const union key_payload *) = NULL; + struct key_restriction *restrict_link = NULL; /* look up the key type to see if it's one of the registered kernel * types */ @@ -854,20 +857,21 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref, } index_key.desc_len = strlen(index_key.description); - if (restrict_link) { - ret = restrict_link(keyring, index_key.type, &prep.payload); - if (ret < 0) { - key_ref = ERR_PTR(ret); - goto error_free_prep; - } - } - ret = __key_link_begin(keyring, &index_key, &edit); if (ret < 0) { key_ref = ERR_PTR(ret); goto error_free_prep; } + if (restrict_link && restrict_link->check) { + ret = restrict_link->check(keyring, index_key.type, + &prep.payload, restrict_link->key); + if (ret < 0) { + key_ref = ERR_PTR(ret); + goto error_link_end; + } + } + /* if we're going to allocate a new key, we're going to have * to modify the keyring */ ret = key_permission(keyring_ref, KEY_NEED_WRITE); diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index 52c34532c7856..10fcea154c0f6 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -1583,6 +1583,59 @@ error_keyring: } /* + * Apply a restriction to a given keyring. + * + * The caller must have Setattr permission to change keyring restrictions. + * + * The requested type name may be a NULL pointer to reject all attempts + * to link to the keyring. If _type is non-NULL, _restriction can be + * NULL or a pointer to a string describing the restriction. If _type is + * NULL, _restriction must also be NULL. + * + * Returns 0 if successful. + */ +long keyctl_restrict_keyring(key_serial_t id, const char __user *_type, + const char __user *_restriction) +{ + key_ref_t key_ref; + bool link_reject = !_type; + char type[32]; + char *restriction = NULL; + long ret; + + key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR); + if (IS_ERR(key_ref)) + return PTR_ERR(key_ref); + + if (_type) { + ret = key_get_type_from_user(type, _type, sizeof(type)); + if (ret < 0) + goto error; + } + + if (_restriction) { + if (!_type) { + ret = -EINVAL; + goto error; + } + + restriction = strndup_user(_restriction, PAGE_SIZE); + if (IS_ERR(restriction)) { + ret = PTR_ERR(restriction); + goto error; + } + } + + ret = keyring_restrict(key_ref, link_reject ? NULL : type, restriction); + kfree(restriction); + +error: + key_ref_put(key_ref); + + return ret; +} + +/* * The key control system call */ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, @@ -1691,7 +1744,12 @@ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, case KEYCTL_DH_COMPUTE: return keyctl_dh_compute((struct keyctl_dh_params __user *) arg2, (char __user *) arg3, (size_t) arg4, - (void __user *) arg5); + (struct keyctl_kdf_params __user *) arg5); + + case KEYCTL_RESTRICT_KEYRING: + return keyctl_restrict_keyring((key_serial_t) arg2, + (const char __user *) arg3, + (const char __user *) arg4); default: return -EOPNOTSUPP; diff --git a/security/keys/keyring.c b/security/keys/keyring.c index c91e4e0cea08b..4d1678e4586f6 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -394,6 +394,13 @@ static void keyring_destroy(struct key *keyring) write_unlock(&keyring_name_lock); } + if (keyring->restrict_link) { + struct key_restriction *keyres = keyring->restrict_link; + + key_put(keyres->key); + kfree(keyres); + } + assoc_array_destroy(&keyring->keys, &keyring_assoc_array_ops); } @@ -492,9 +499,7 @@ static long keyring_read(const struct key *keyring, struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid, const struct cred *cred, key_perm_t perm, unsigned long flags, - int (*restrict_link)(struct key *, - const struct key_type *, - const union key_payload *), + struct key_restriction *restrict_link, struct key *dest) { struct key *keyring; @@ -519,17 +524,19 @@ EXPORT_SYMBOL(keyring_alloc); * @keyring: The keyring being added to. * @type: The type of key being added. * @payload: The payload of the key intended to be added. + * @data: Additional data for evaluating restriction. * * Reject the addition of any links to a keyring. It can be overridden by * passing KEY_ALLOC_BYPASS_RESTRICTION to key_instantiate_and_link() when * adding a key to a keyring. * - * This is meant to be passed as the restrict_link parameter to - * keyring_alloc(). + * This is meant to be stored in a key_restriction structure which is passed + * in the restrict_link parameter to keyring_alloc(). */ int restrict_link_reject(struct key *keyring, const struct key_type *type, - const union key_payload *payload) + const union key_payload *payload, + struct key *restriction_key) { return -EPERM; } @@ -940,6 +947,111 @@ key_ref_t keyring_search(key_ref_t keyring, } EXPORT_SYMBOL(keyring_search); +static struct key_restriction *keyring_restriction_alloc( + key_restrict_link_func_t check) +{ + struct key_restriction *keyres = + kzalloc(sizeof(struct key_restriction), GFP_KERNEL); + + if (!keyres) + return ERR_PTR(-ENOMEM); + + keyres->check = check; + + return keyres; +} + +/* + * Semaphore to serialise restriction setup to prevent reference count + * cycles through restriction key pointers. + */ +static DECLARE_RWSEM(keyring_serialise_restrict_sem); + +/* + * Check for restriction cycles that would prevent keyring garbage collection. + * keyring_serialise_restrict_sem must be held. + */ +static bool keyring_detect_restriction_cycle(const struct key *dest_keyring, + struct key_restriction *keyres) +{ + while (keyres && keyres->key && + keyres->key->type == &key_type_keyring) { + if (keyres->key == dest_keyring) + return true; + + keyres = keyres->key->restrict_link; + } + + return false; +} + +/** + * keyring_restrict - Look up and apply a restriction to a keyring + * + * @keyring: The keyring to be restricted + * @restriction: The restriction options to apply to the keyring + */ +int keyring_restrict(key_ref_t keyring_ref, const char *type, + const char *restriction) +{ + struct key *keyring; + struct key_type *restrict_type = NULL; + struct key_restriction *restrict_link; + int ret = 0; + + keyring = key_ref_to_ptr(keyring_ref); + key_check(keyring); + + if (keyring->type != &key_type_keyring) + return -ENOTDIR; + + if (!type) { + restrict_link = keyring_restriction_alloc(restrict_link_reject); + } else { + restrict_type = key_type_lookup(type); + + if (IS_ERR(restrict_type)) + return PTR_ERR(restrict_type); + + if (!restrict_type->lookup_restriction) { + ret = -ENOENT; + goto error; + } + + restrict_link = restrict_type->lookup_restriction(restriction); + } + + if (IS_ERR(restrict_link)) { + ret = PTR_ERR(restrict_link); + goto error; + } + + down_write(&keyring->sem); + down_write(&keyring_serialise_restrict_sem); + + if (keyring->restrict_link) + ret = -EEXIST; + else if (keyring_detect_restriction_cycle(keyring, restrict_link)) + ret = -EDEADLK; + else + keyring->restrict_link = restrict_link; + + up_write(&keyring_serialise_restrict_sem); + up_write(&keyring->sem); + + if (ret < 0) { + key_put(restrict_link->key); + kfree(restrict_link); + } + +error: + if (restrict_type) + key_type_put(restrict_type); + + return ret; +} +EXPORT_SYMBOL(keyring_restrict); + /* * Search the given keyring for a key that might be updated. * @@ -1033,7 +1145,7 @@ struct key *find_keyring_by_name(const char *name, bool skip_perm_check) /* we've got a match but we might end up racing with * key_cleanup() if the keyring is currently 'dead' * (ie. it has a zero usage count) */ - if (!atomic_inc_not_zero(&keyring->usage)) + if (!refcount_inc_not_zero(&keyring->usage)) continue; keyring->last_used_at = current_kernel_time().tv_sec; goto out; @@ -1220,9 +1332,10 @@ void __key_link_end(struct key *keyring, */ static int __key_link_check_restriction(struct key *keyring, struct key *key) { - if (!keyring->restrict_link) + if (!keyring->restrict_link || !keyring->restrict_link->check) return 0; - return keyring->restrict_link(keyring, key->type, &key->payload); + return keyring->restrict_link->check(keyring, key->type, &key->payload, + keyring->restrict_link->key); } /** @@ -1250,14 +1363,14 @@ int key_link(struct key *keyring, struct key *key) struct assoc_array_edit *edit; int ret; - kenter("{%d,%d}", keyring->serial, atomic_read(&keyring->usage)); + kenter("{%d,%d}", keyring->serial, refcount_read(&keyring->usage)); key_check(keyring); key_check(key); ret = __key_link_begin(keyring, &key->index_key, &edit); if (ret == 0) { - kdebug("begun {%d,%d}", keyring->serial, atomic_read(&keyring->usage)); + kdebug("begun {%d,%d}", keyring->serial, refcount_read(&keyring->usage)); ret = __key_link_check_restriction(keyring, key); if (ret == 0) ret = __key_link_check_live_key(keyring, key); @@ -1266,7 +1379,7 @@ int key_link(struct key *keyring, struct key *key) __key_link_end(keyring, &key->index_key, edit); } - kleave(" = %d {%d,%d}", ret, keyring->serial, atomic_read(&keyring->usage)); + kleave(" = %d {%d,%d}", ret, keyring->serial, refcount_read(&keyring->usage)); return ret; } EXPORT_SYMBOL(key_link); @@ -1426,3 +1539,53 @@ do_gc: up_write(&keyring->sem); kleave(" [gc]"); } + +/* + * Garbage collect restriction pointers from a keyring. + * + * Keyring restrictions are associated with a key type, and must be cleaned + * up if the key type is unregistered. The restriction is altered to always + * reject additional keys so a keyring cannot be opened up by unregistering + * a key type. + * + * Not called with any keyring locks held. The keyring's key struct will not + * be deallocated under us as only our caller may deallocate it. + * + * The caller is required to hold key_types_sem and dead_type->sem. This is + * fulfilled by key_gc_keytype() holding the locks on behalf of + * key_garbage_collector(), which it invokes on a workqueue. + */ +void keyring_restriction_gc(struct key *keyring, struct key_type *dead_type) +{ + struct key_restriction *keyres; + + kenter("%x{%s}", keyring->serial, keyring->description ?: ""); + + /* + * keyring->restrict_link is only assigned at key allocation time + * or with the key type locked, so the only values that could be + * concurrently assigned to keyring->restrict_link are for key + * types other than dead_type. Given this, it's ok to check + * the key type before acquiring keyring->sem. + */ + if (!dead_type || !keyring->restrict_link || + keyring->restrict_link->keytype != dead_type) { + kleave(" [no restriction gc]"); + return; + } + + /* Lock the keyring to ensure that a link is not in progress */ + down_write(&keyring->sem); + + keyres = keyring->restrict_link; + + keyres->check = restrict_link_reject; + + key_put(keyres->key); + keyres->key = NULL; + keyres->keytype = NULL; + + up_write(&keyring->sem); + + kleave(" [restriction gc]"); +} diff --git a/security/keys/proc.c b/security/keys/proc.c index b9f531c9e4fa7..bf08d02b6646a 100644 --- a/security/keys/proc.c +++ b/security/keys/proc.c @@ -252,7 +252,7 @@ static int proc_keys_show(struct seq_file *m, void *v) showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT), showflag(key, 'N', KEY_FLAG_NEGATIVE), showflag(key, 'i', KEY_FLAG_INVALIDATED), - atomic_read(&key->usage), + refcount_read(&key->usage), xbuf, key->perm, from_kuid_munged(seq_user_ns(m), key->uid), @@ -340,7 +340,7 @@ static int proc_key_users_show(struct seq_file *m, void *v) seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n", from_kuid_munged(seq_user_ns(m), user->uid), - atomic_read(&user->usage), + refcount_read(&user->usage), atomic_read(&user->nkeys), atomic_read(&user->nikeys), user->qnkeys, diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c index b6fdd22205b16..44451af828c0d 100644 --- a/security/keys/process_keys.c +++ b/security/keys/process_keys.c @@ -30,7 +30,7 @@ static DEFINE_MUTEX(key_user_keyring_mutex); /* The root user's tracking struct */ struct key_user root_key_user = { - .usage = ATOMIC_INIT(3), + .usage = REFCOUNT_INIT(3), .cons_lock = __MUTEX_INITIALIZER(root_key_user.cons_lock), .lock = __SPIN_LOCK_UNLOCKED(root_key_user.lock), .nkeys = ATOMIC_INIT(2), diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c index 6bbe2f535f080..0f062156dfb24 100644 --- a/security/keys/request_key_auth.c +++ b/security/keys/request_key_auth.c @@ -213,7 +213,7 @@ struct key *request_key_auth_new(struct key *target, const void *callout_info, if (ret < 0) goto error_inst; - kleave(" = {%d,%d}", authkey->serial, atomic_read(&authkey->usage)); + kleave(" = {%d,%d}", authkey->serial, refcount_read(&authkey->usage)); return authkey; auth_key_revoked: diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index d37a72316e9d1..e67a526d1f301 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4367,10 +4367,18 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in u32 sid, node_perm; if (family == PF_INET) { + if (addrlen < sizeof(struct sockaddr_in)) { + err = -EINVAL; + goto out; + } addr4 = (struct sockaddr_in *)address; snum = ntohs(addr4->sin_port); addrp = (char *)&addr4->sin_addr.s_addr; } else { + if (addrlen < SIN6_LEN_RFC2133) { + err = -EINVAL; + goto out; + } addr6 = (struct sockaddr_in6 *)address; snum = ntohs(addr6->sin6_port); addrp = (char *)&addr6->sin6_addr.s6_addr; diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c index 2ca9cde939d44..57e2596bdd8a0 100644 --- a/security/selinux/nlmsgtab.c +++ b/security/selinux/nlmsgtab.c @@ -28,7 +28,7 @@ struct nlmsg_perm { u32 perm; }; -static struct nlmsg_perm nlmsg_route_perms[] = +static const struct nlmsg_perm nlmsg_route_perms[] = { { RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, { RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, @@ -80,7 +80,7 @@ static struct nlmsg_perm nlmsg_route_perms[] = { RTM_GETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ }, }; -static struct nlmsg_perm nlmsg_tcpdiag_perms[] = +static const struct nlmsg_perm nlmsg_tcpdiag_perms[] = { { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, @@ -88,7 +88,7 @@ static struct nlmsg_perm nlmsg_tcpdiag_perms[] = { SOCK_DESTROY, NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE }, }; -static struct nlmsg_perm nlmsg_xfrm_perms[] = +static const struct nlmsg_perm nlmsg_xfrm_perms[] = { { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, @@ -115,7 +115,7 @@ static struct nlmsg_perm nlmsg_xfrm_perms[] = { XFRM_MSG_MAPPING, NETLINK_XFRM_SOCKET__NLMSG_READ }, }; -static struct nlmsg_perm nlmsg_audit_perms[] = +static const struct nlmsg_perm nlmsg_audit_perms[] = { { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, @@ -136,7 +136,7 @@ static struct nlmsg_perm nlmsg_audit_perms[] = }; -static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize) +static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab, size_t tabsize) { int i, err = -EINVAL; diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index cb3fd98fb05ae..ce71718842231 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -1456,10 +1456,10 @@ static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) { struct avc_cache_stats *st = v; - if (v == SEQ_START_TOKEN) - seq_printf(seq, "lookups hits misses allocations reclaims " - "frees\n"); - else { + if (v == SEQ_START_TOKEN) { + seq_puts(seq, + "lookups hits misses allocations reclaims frees\n"); + } else { unsigned int lookups = st->lookups; unsigned int misses = st->misses; unsigned int hits = lookups - misses; diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c index 34afeadd9e73a..771c96afe1d53 100644 --- a/security/selinux/ss/conditional.c +++ b/security/selinux/ss/conditional.c @@ -176,8 +176,9 @@ void cond_policydb_destroy(struct policydb *p) int cond_init_bool_indexes(struct policydb *p) { kfree(p->bool_val_to_struct); - p->bool_val_to_struct = - kmalloc(p->p_bools.nprim * sizeof(struct cond_bool_datum *), GFP_KERNEL); + p->bool_val_to_struct = kmalloc_array(p->p_bools.nprim, + sizeof(*p->bool_val_to_struct), + GFP_KERNEL); if (!p->bool_val_to_struct) return -ENOMEM; return 0; @@ -226,7 +227,7 @@ int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp) u32 len; int rc; - booldatum = kzalloc(sizeof(struct cond_bool_datum), GFP_KERNEL); + booldatum = kzalloc(sizeof(*booldatum), GFP_KERNEL); if (!booldatum) return -ENOMEM; @@ -331,7 +332,7 @@ static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum goto err; } - list = kzalloc(sizeof(struct cond_av_list), GFP_KERNEL); + list = kzalloc(sizeof(*list), GFP_KERNEL); if (!list) { rc = -ENOMEM; goto err; @@ -420,7 +421,7 @@ static int cond_read_node(struct policydb *p, struct cond_node *node, void *fp) goto err; rc = -ENOMEM; - expr = kzalloc(sizeof(struct cond_expr), GFP_KERNEL); + expr = kzalloc(sizeof(*expr), GFP_KERNEL); if (!expr) goto err; @@ -471,7 +472,7 @@ int cond_read_list(struct policydb *p, void *fp) for (i = 0; i < len; i++) { rc = -ENOMEM; - node = kzalloc(sizeof(struct cond_node), GFP_KERNEL); + node = kzalloc(sizeof(*node), GFP_KERNEL); if (!node) goto err; @@ -663,5 +664,4 @@ void cond_compute_av(struct avtab *ctab, struct avtab_key *key, (node->key.specified & AVTAB_XPERMS)) services_compute_xperms_drivers(xperms, node); } - return; } diff --git a/security/selinux/ss/hashtab.c b/security/selinux/ss/hashtab.c index 2cc4961498428..3858706a29fbb 100644 --- a/security/selinux/ss/hashtab.c +++ b/security/selinux/ss/hashtab.c @@ -17,15 +17,15 @@ struct hashtab *hashtab_create(u32 (*hash_value)(struct hashtab *h, const void * u32 i; p = kzalloc(sizeof(*p), GFP_KERNEL); - if (p == NULL) + if (!p) return p; p->size = size; p->nel = 0; p->hash_value = hash_value; p->keycmp = keycmp; - p->htable = kmalloc(sizeof(*(p->htable)) * size, GFP_KERNEL); - if (p->htable == NULL) { + p->htable = kmalloc_array(size, sizeof(*p->htable), GFP_KERNEL); + if (!p->htable) { kfree(p); return NULL; } @@ -58,7 +58,7 @@ int hashtab_insert(struct hashtab *h, void *key, void *datum) return -EEXIST; newnode = kzalloc(sizeof(*newnode), GFP_KERNEL); - if (newnode == NULL) + if (!newnode) return -ENOMEM; newnode->key = key; newnode->datum = datum; @@ -87,7 +87,7 @@ void *hashtab_search(struct hashtab *h, const void *key) while (cur && h->keycmp(h, key, cur->key) > 0) cur = cur->next; - if (cur == NULL || (h->keycmp(h, key, cur->key) != 0)) + if (!cur || (h->keycmp(h, key, cur->key) != 0)) return NULL; return cur->datum; diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index 9c92f29a38ea4..0080122760ad4 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -178,10 +178,9 @@ static int roles_init(struct policydb *p) int rc; struct role_datum *role; - rc = -ENOMEM; role = kzalloc(sizeof(*role), GFP_KERNEL); if (!role) - goto out; + return -ENOMEM; rc = -EINVAL; role->value = ++p->p_roles.nprim; @@ -540,23 +539,23 @@ static int policydb_index(struct policydb *p) #endif rc = -ENOMEM; - p->class_val_to_struct = - kzalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), - GFP_KERNEL); + p->class_val_to_struct = kcalloc(p->p_classes.nprim, + sizeof(*p->class_val_to_struct), + GFP_KERNEL); if (!p->class_val_to_struct) goto out; rc = -ENOMEM; - p->role_val_to_struct = - kzalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)), - GFP_KERNEL); + p->role_val_to_struct = kcalloc(p->p_roles.nprim, + sizeof(*p->role_val_to_struct), + GFP_KERNEL); if (!p->role_val_to_struct) goto out; rc = -ENOMEM; - p->user_val_to_struct = - kzalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)), - GFP_KERNEL); + p->user_val_to_struct = kcalloc(p->p_users.nprim, + sizeof(*p->user_val_to_struct), + GFP_KERNEL); if (!p->user_val_to_struct) goto out; @@ -880,8 +879,6 @@ void policydb_destroy(struct policydb *p) ebitmap_destroy(&p->filename_trans_ttypes); ebitmap_destroy(&p->policycaps); ebitmap_destroy(&p->permissive_map); - - return; } /* @@ -1120,10 +1117,9 @@ static int perm_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[2]; u32 len; - rc = -ENOMEM; perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL); if (!perdatum) - goto bad; + return -ENOMEM; rc = next_entry(buf, fp, sizeof buf); if (rc) @@ -1154,10 +1150,9 @@ static int common_read(struct policydb *p, struct hashtab *h, void *fp) u32 len, nel; int i, rc; - rc = -ENOMEM; comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL); if (!comdatum) - goto bad; + return -ENOMEM; rc = next_entry(buf, fp, sizeof buf); if (rc) @@ -1320,10 +1315,9 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp) u32 len, len2, ncons, nel; int i, rc; - rc = -ENOMEM; cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL); if (!cladatum) - goto bad; + return -ENOMEM; rc = next_entry(buf, fp, sizeof(u32)*6); if (rc) @@ -1414,10 +1408,9 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[3]; u32 len; - rc = -ENOMEM; role = kzalloc(sizeof(*role), GFP_KERNEL); if (!role) - goto bad; + return -ENOMEM; if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) to_read = 3; @@ -1471,10 +1464,9 @@ static int type_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[4]; u32 len; - rc = -ENOMEM; typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL); if (!typdatum) - goto bad; + return -ENOMEM; if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) to_read = 4; @@ -1546,10 +1538,9 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[3]; u32 len; - rc = -ENOMEM; usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL); if (!usrdatum) - goto bad; + return -ENOMEM; if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) to_read = 3; @@ -1597,10 +1588,9 @@ static int sens_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[2]; u32 len; - rc = -ENOMEM; levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC); if (!levdatum) - goto bad; + return -ENOMEM; rc = next_entry(buf, fp, sizeof buf); if (rc) @@ -1614,7 +1604,7 @@ static int sens_read(struct policydb *p, struct hashtab *h, void *fp) goto bad; rc = -ENOMEM; - levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC); + levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC); if (!levdatum->level) goto bad; @@ -1639,10 +1629,9 @@ static int cat_read(struct policydb *p, struct hashtab *h, void *fp) __le32 buf[3]; u32 len; - rc = -ENOMEM; catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC); if (!catdatum) - goto bad; + return -ENOMEM; rc = next_entry(buf, fp, sizeof buf); if (rc) @@ -1854,7 +1843,7 @@ static int range_read(struct policydb *p, void *fp) rc = next_entry(buf, fp, sizeof(u32)); if (rc) - goto out; + return rc; nel = le32_to_cpu(buf[0]); for (i = 0; i < nel; i++) { @@ -1931,7 +1920,6 @@ static int filename_trans_read(struct policydb *p, void *fp) nel = le32_to_cpu(buf[0]); for (i = 0; i < nel; i++) { - ft = NULL; otype = NULL; name = NULL; @@ -2008,7 +1996,7 @@ static int genfs_read(struct policydb *p, void *fp) rc = next_entry(buf, fp, sizeof(u32)); if (rc) - goto out; + return rc; nel = le32_to_cpu(buf[0]); for (i = 0; i < nel; i++) { @@ -2100,9 +2088,10 @@ static int genfs_read(struct policydb *p, void *fp) } rc = 0; out: - if (newgenfs) + if (newgenfs) { kfree(newgenfs->fstype); - kfree(newgenfs); + kfree(newgenfs); + } ocontext_destroy(newc, OCON_FSUSE); return rc; diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index b4aa491a0a23d..60d9b02523215 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -157,7 +157,7 @@ static int selinux_set_mapping(struct policydb *pol, } k = 0; - while (p_in->perms && p_in->perms[k]) { + while (p_in->perms[k]) { /* An empty permission string skips ahead */ if (!*p_in->perms[k]) { k++; diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c index 5840a35155fc3..f6915f257486a 100644 --- a/security/selinux/ss/sidtab.c +++ b/security/selinux/ss/sidtab.c @@ -18,7 +18,7 @@ int sidtab_init(struct sidtab *s) { int i; - s->htable = kmalloc(sizeof(*(s->htable)) * SIDTAB_SIZE, GFP_ATOMIC); + s->htable = kmalloc_array(SIDTAB_SIZE, sizeof(*s->htable), GFP_ATOMIC); if (!s->htable) return -ENOMEM; for (i = 0; i < SIDTAB_SIZE; i++) @@ -54,7 +54,7 @@ int sidtab_insert(struct sidtab *s, u32 sid, struct context *context) } newnode = kmalloc(sizeof(*newnode), GFP_ATOMIC); - if (newnode == NULL) { + if (!newnode) { rc = -ENOMEM; goto out; } @@ -98,7 +98,7 @@ static struct context *sidtab_search_core(struct sidtab *s, u32 sid, int force) if (force && cur && sid == cur->sid && cur->context.len) return &cur->context; - if (cur == NULL || sid != cur->sid || cur->context.len) { + if (!cur || sid != cur->sid || cur->context.len) { /* Remap invalid SIDs to the unlabeled SID. */ sid = SECINITSID_UNLABELED; hvalue = SIDTAB_HASH(sid); diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c index 7041a580019ec..223f21ffa632e 100644 --- a/security/tomoyo/file.c +++ b/security/tomoyo/file.c @@ -692,7 +692,7 @@ int tomoyo_path_number_perm(const u8 type, const struct path *path, { struct tomoyo_request_info r; struct tomoyo_obj_info obj = { - .path1 = *path, + .path1 = { .mnt = path->mnt, .dentry = path->dentry }, }; int error = -ENOMEM; struct tomoyo_path_info buf; @@ -740,7 +740,7 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, struct tomoyo_path_info buf; struct tomoyo_request_info r; struct tomoyo_obj_info obj = { - .path1 = *path, + .path1 = { .mnt = path->mnt, .dentry = path->dentry }, }; int idx; @@ -786,7 +786,7 @@ int tomoyo_path_perm(const u8 operation, const struct path *path, const char *ta { struct tomoyo_request_info r; struct tomoyo_obj_info obj = { - .path1 = *path, + .path1 = { .mnt = path->mnt, .dentry = path->dentry }, }; int error; struct tomoyo_path_info buf; @@ -843,7 +843,7 @@ int tomoyo_mkdev_perm(const u8 operation, const struct path *path, { struct tomoyo_request_info r; struct tomoyo_obj_info obj = { - .path1 = *path, + .path1 = { .mnt = path->mnt, .dentry = path->dentry }, }; int error = -ENOMEM; struct tomoyo_path_info buf; @@ -890,8 +890,8 @@ int tomoyo_path2_perm(const u8 operation, const struct path *path1, struct tomoyo_path_info buf2; struct tomoyo_request_info r; struct tomoyo_obj_info obj = { - .path1 = *path1, - .path2 = *path2, + .path1 = { .mnt = path1->mnt, .dentry = path1->dentry }, + .path2 = { .mnt = path2->mnt, .dentry = path2->dentry } }; int idx; diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c index b5fb930349a99..130b4fa4f65fd 100644 --- a/security/tomoyo/tomoyo.c +++ b/security/tomoyo/tomoyo.c @@ -165,7 +165,7 @@ static int tomoyo_path_truncate(const struct path *path) */ static int tomoyo_path_unlink(const struct path *parent, struct dentry *dentry) { - struct path path = { parent->mnt, dentry }; + struct path path = { .mnt = parent->mnt, .dentry = dentry }; return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL); } @@ -181,7 +181,7 @@ static int tomoyo_path_unlink(const struct path *parent, struct dentry *dentry) static int tomoyo_path_mkdir(const struct path *parent, struct dentry *dentry, umode_t mode) { - struct path path = { parent->mnt, dentry }; + struct path path = { .mnt = parent->mnt, .dentry = dentry }; return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path, mode & S_IALLUGO); } @@ -196,7 +196,7 @@ static int tomoyo_path_mkdir(const struct path *parent, struct dentry *dentry, */ static int tomoyo_path_rmdir(const struct path *parent, struct dentry *dentry) { - struct path path = { parent->mnt, dentry }; + struct path path = { .mnt = parent->mnt, .dentry = dentry }; return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL); } @@ -212,7 +212,7 @@ static int tomoyo_path_rmdir(const struct path *parent, struct dentry *dentry) static int tomoyo_path_symlink(const struct path *parent, struct dentry *dentry, const char *old_name) { - struct path path = { parent->mnt, dentry }; + struct path path = { .mnt = parent->mnt, .dentry = dentry }; return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name); } @@ -229,7 +229,7 @@ static int tomoyo_path_symlink(const struct path *parent, struct dentry *dentry, static int tomoyo_path_mknod(const struct path *parent, struct dentry *dentry, umode_t mode, unsigned int dev) { - struct path path = { parent->mnt, dentry }; + struct path path = { .mnt = parent->mnt, .dentry = dentry }; int type = TOMOYO_TYPE_CREATE; const unsigned int perm = mode & S_IALLUGO; @@ -268,8 +268,8 @@ static int tomoyo_path_mknod(const struct path *parent, struct dentry *dentry, static int tomoyo_path_link(struct dentry *old_dentry, const struct path *new_dir, struct dentry *new_dentry) { - struct path path1 = { new_dir->mnt, old_dentry }; - struct path path2 = { new_dir->mnt, new_dentry }; + struct path path1 = { .mnt = new_dir->mnt, .dentry = old_dentry }; + struct path path2 = { .mnt = new_dir->mnt, .dentry = new_dentry }; return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2); } @@ -288,8 +288,8 @@ static int tomoyo_path_rename(const struct path *old_parent, const struct path *new_parent, struct dentry *new_dentry) { - struct path path1 = { old_parent->mnt, old_dentry }; - struct path path2 = { new_parent->mnt, new_dentry }; + struct path path1 = { .mnt = old_parent->mnt, .dentry = old_dentry }; + struct path path2 = { .mnt = new_parent->mnt, .dentry = new_dentry }; return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2); } @@ -417,7 +417,7 @@ static int tomoyo_sb_mount(const char *dev_name, const struct path *path, */ static int tomoyo_sb_umount(struct vfsmount *mnt, int flags) { - struct path path = { mnt, mnt->mnt_root }; + struct path path = { .mnt = mnt, .dentry = mnt->mnt_root }; return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL); } |