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authorMiklos Szeredi <mszeredi@suse.cz>2012-08-15 13:01:24 +0200
committerMiklos Szeredi <mszeredi@suse.cz>2012-08-15 13:01:24 +0200
commite68726ff72cf7ba5e7d789857fcd9a75ca573f03 (patch)
tree7d5f3416543a750574955fdef5f12b3dd498de05 /fs
parentddf343f635fe4440cad528e12f96f28bd50aa099 (diff)
vfs: canonicalize create mode in build_open_flags()
Userspace can pass weird create mode in open(2) that we canonicalize to "(mode & S_IALLUGO) | S_IFREG" in vfs_create(). The problem is that we use the uncanonicalized mode before calling vfs_create() with unforseen consequences. So do the canonicalization early in build_open_flags(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Tested-by: Richard W.M. Jones <rjones@redhat.com> CC: stable@vger.kernel.org
Diffstat (limited to 'fs')
-rw-r--r--fs/open.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/open.c b/fs/open.c
index bc132e167d2d..e1f2cdb91a4d 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -852,9 +852,10 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
int lookup_flags = 0;
int acc_mode;
- if (!(flags & O_CREAT))
- mode = 0;
- op->mode = mode;
+ if (flags & O_CREAT)
+ op->mode = (mode & S_IALLUGO) | S_IFREG;
+ else
+ op->mode = 0;
/* Must never be set by userspace */
flags &= ~FMODE_NONOTIFY;