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| author | Vasily Averin <vvs@virtuozzo.com> | 2015-06-25 15:01:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-25 17:00:39 -0700 |
| commit | 3ea4331c60be3eee4c97e5ddabad95399f879b76 (patch) | |
| tree | 6977f3c7a8a72003f3b324de5ce4bb490274ff53 /kernel/printk | |
| parent | d194e5d666225b04c7754471df0948f645b6ab3a (diff) | |
| download | linux-0-day-3ea4331c60be3eee4c97e5ddabad95399f879b76.tar.gz linux-0-day-3ea4331c60be3eee4c97e5ddabad95399f879b76.tar.xz | |
check_syslog_permissions() cleanup
Patch fixes drawbacks in heck_syslog_permissions() noticed by AKPM:
"from_file handling makes me cry.
That's not a boolean - it's an enumerated value with two values
currently defined.
But the code in check_syslog_permissions() treats it as a boolean and
also hardwires the knowledge that SYSLOG_FROM_PROC == 1 (or == `true`).
And the name is wrong: it should be called from_proc to match
SYSLOG_FROM_PROC."
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Josh Boyer <jwboyer@redhat.com>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/printk')
| -rw-r--r-- | kernel/printk/printk.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 45fa8c88ac472..de553849f3ac9 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -489,13 +489,13 @@ static int syslog_action_restricted(int type) type != SYSLOG_ACTION_SIZE_BUFFER; } -int check_syslog_permissions(int type, bool from_file) +int check_syslog_permissions(int type, int source) { /* * If this is from /proc/kmsg and we've already opened it, then we've * already done the capabilities checks at open time. */ - if (from_file && type != SYSLOG_ACTION_OPEN) + if (source == SYSLOG_FROM_PROC && type != SYSLOG_ACTION_OPEN) goto ok; if (syslog_action_restricted(type)) { @@ -1290,13 +1290,13 @@ static int syslog_print_all(char __user *buf, int size, bool clear) return len; } -int do_syslog(int type, char __user *buf, int len, bool from_file) +int do_syslog(int type, char __user *buf, int len, int source) { bool clear = false; static int saved_console_loglevel = LOGLEVEL_DEFAULT; int error; - error = check_syslog_permissions(type, from_file); + error = check_syslog_permissions(type, source); if (error) goto out; @@ -1379,7 +1379,7 @@ int do_syslog(int type, char __user *buf, int len, bool from_file) syslog_prev = 0; syslog_partial = 0; } - if (from_file) { + if (source == SYSLOG_FROM_PROC) { /* * Short-cut for poll(/"proc/kmsg") which simply checks * for pending data, not the size; return the count of |