stuartl/linux-mainline
1
0
Fork 0
mirror of https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux synced 2025-11-04 16:52:06 +10:00
Code Issues Releases Wiki Activity

RAMFS NOMMU: missed POSIX UID/GID inode attribute checking

Browse Source 
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>
This commit is contained in:
Bryan Wu 2007-06-05 11:02:01 +08:00 committed by Linus Torvalds
parent c8d8170feb
commit 85f6038f21
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
fs/ramfs/file-nommu.c
View File

@ -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))