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| author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-12 14:06:34 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-12 14:47:58 -0800 |
| commit | 974a9f0b47da74e28f68b9c8645c3786aa5ace1a (patch) | |
| tree | 79f1aaba6998830be0d11bf7a2258529584b35c3 /fs/namei.c | |
| parent | d0c4c9d4a2e46f052178806c4004d52cd3ae040f (diff) | |
| download | lwn-974a9f0b47da74e28f68b9c8645c3786aa5ace1a.tar.gz lwn-974a9f0b47da74e28f68b9c8645c3786aa5ace1a.zip | |
Use access mode instead of open flags to determine needed permissions
Way back when (in commit 834f2a4a1554dc5b2598038b3fe8703defcbe467, aka
"VFS: Allow the filesystem to return a full file pointer on open intent"
to be exact), Trond changed the open logic to keep track of the original
flags to a file open, in order to pass down the the intent of a dentry
lookup to the low-level filesystem.
However, when doing that reorganization, it changed the meaning of
namei_flags, and thus inadvertently changed the test of access mode for
directories (and RO filesystem) to use the wrong flag. So fix those
test back to use access mode ("acc_mode") rather than the open flag
("flag").
Issue noticed by Bill Roman at Datalight.
Reported-and-tested-by: Bill Roman <bill.roman@datalight.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/namei.c b/fs/namei.c index 3b993db26cee..73e2e665817a 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1605,7 +1605,7 @@ int may_open(struct nameidata *nd, int acc_mode, int flag) if (S_ISLNK(inode->i_mode)) return -ELOOP; - if (S_ISDIR(inode->i_mode) && (flag & FMODE_WRITE)) + if (S_ISDIR(inode->i_mode) && (acc_mode & MAY_WRITE)) return -EISDIR; /* @@ -1620,7 +1620,7 @@ int may_open(struct nameidata *nd, int acc_mode, int flag) return -EACCES; flag &= ~O_TRUNC; - } else if (IS_RDONLY(inode) && (flag & FMODE_WRITE)) + } else if (IS_RDONLY(inode) && (acc_mode & MAY_WRITE)) return -EROFS; error = vfs_permission(nd, acc_mode); |