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| author | Marc Dionne <marc.dionne@auristor.com> | 2017-03-16 16:27:44 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2017-03-16 16:27:44 +0000 |
| commit | 627f46943ff90bcc32ddeb675d881c043c6fa2ae (patch) | |
| tree | 7c6b03378fd22a35becb173475bcc8d80061c855 /fs | |
| parent | 6186f0788b31f44affceeedc7b48eb10faea120d (diff) | |
| download | linux-0-day-627f46943ff90bcc32ddeb675d881c043c6fa2ae.tar.gz linux-0-day-627f46943ff90bcc32ddeb675d881c043c6fa2ae.tar.xz | |
afs: Adjust mode bits processing
Mode bits for an afs file should not be enforced in the usual
way.
For files, the absence of user bits can restrict file access
with respect to what is granted by the server.
These bits apply regardless of the owner or the current uid; the
rest of the mode bits (group, other) are ignored.
Signed-off-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/afs/security.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/afs/security.c b/fs/afs/security.c index 8d010422dc896..bfa9d34283835 100644 --- a/fs/afs/security.c +++ b/fs/afs/security.c @@ -340,17 +340,22 @@ int afs_permission(struct inode *inode, int mask) } else { if (!(access & AFS_ACE_LOOKUP)) goto permission_denied; + if ((mask & MAY_EXEC) && !(inode->i_mode & S_IXUSR)) + goto permission_denied; if (mask & (MAY_EXEC | MAY_READ)) { if (!(access & AFS_ACE_READ)) goto permission_denied; + if (!(inode->i_mode & S_IRUSR)) + goto permission_denied; } else if (mask & MAY_WRITE) { if (!(access & AFS_ACE_WRITE)) goto permission_denied; + if (!(inode->i_mode & S_IWUSR)) + goto permission_denied; } } key_put(key); - ret = generic_permission(inode, mask); _leave(" = %d", ret); return ret; |