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| author | Jeff Layton <jlayton@redhat.com> | 2007-10-18 03:05:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-18 14:37:22 -0700 |
| commit | 8a0ce7d99a4d19788e017f3138bc59b9962057ae (patch) | |
| tree | 07b61f8760081e377274f055e0433dc1695b6549 /fs/nfsd | |
| parent | 1ac564ecabc777636cf4eb88840802d7dc57d286 (diff) | |
| download | linux-8a0ce7d99a4d19788e017f3138bc59b9962057ae.tar.gz linux-8a0ce7d99a4d19788e017f3138bc59b9962057ae.tar.bz2 linux-8a0ce7d99a4d19788e017f3138bc59b9962057ae.zip | |
knfsd: only set ATTR_KILL_S*ID if ATTR_MODE isn't being explicitly set
It's theoretically possible for a single SETATTR call to come in that sets the
mode and the uid/gid. In that case, don't set the ATTR_KILL_S*ID bits since
that would trip the BUG() in notify_change. Just fix up the mode to have the
same effect.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Cc: Neil Brown <neilb@suse.de>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/vfs.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 819545d21670..46934c97f8f7 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -364,14 +364,23 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, if (iap->ia_valid & ATTR_MODE) { iap->ia_mode &= S_IALLUGO; imode = iap->ia_mode |= (imode & ~S_IALLUGO); + /* if changing uid/gid revoke setuid/setgid in mode */ + if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) { + iap->ia_valid |= ATTR_KILL_PRIV; + iap->ia_mode &= ~S_ISUID; + } + if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) + iap->ia_mode &= ~S_ISGID; + } else { + /* + * Revoke setuid/setgid bit on chown/chgrp + */ + if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) + iap->ia_valid |= ATTR_KILL_SUID | ATTR_KILL_PRIV; + if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) + iap->ia_valid |= ATTR_KILL_SGID; } - /* Revoke setuid/setgid bit on chown/chgrp */ - if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) - iap->ia_valid |= ATTR_KILL_SUID | ATTR_KILL_PRIV; - if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) - iap->ia_valid |= ATTR_KILL_SGID; - /* Change the attributes. */ iap->ia_valid |= ATTR_CTIME; |