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authorBryan Wu <bryan.wu@analog.com>2007-06-05 03:02:01 (GMT)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-08 00:11:13 (GMT)
commit85f6038f2170e3335dda09c3dfb0f83110e87019 (patch)
treeb756deeb0873f18ad8711db7dba948ca8d698d6f /fs
parentc8d8170feb824875baf68f8aaecb181a6500ce81 (diff)
RAMFS NOMMU: missed POSIX UID/GID inode attribute checking
This bug was caught by LTP testcase fchmod06 on Blackfin platform. In the manpage of fchmod, "EPERM: The effective UID does not match the owner of the file, and the process is not privileged (Linux: it does not have the CAP_FOWNER capability)." But the ramfs nommu code missed the inode_change_ok POSIX UID/GID verification. This patch fixed this. Signed-off-by: Bryan Wu <bryan.wu@analog.com> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/ramfs/file-nommu.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 9345a46..5d258c4 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -195,6 +195,11 @@ static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia)
unsigned int old_ia_valid = ia->ia_valid;
int ret = 0;
+ /* POSIX UID/GID verification for setting inode attributes */
+ ret = inode_change_ok(inode, ia);
+ if (ret)
+ return ret;
+
/* by providing our own setattr() method, we skip this quotaism */
if ((old_ia_valid & ATTR_UID && ia->ia_uid != inode->i_uid) ||
(old_ia_valid & ATTR_GID && ia->ia_gid != inode->i_gid))

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