[PATCH 8/9] Unionfs: fix unionfs_setattr to handle ATTR_KILL_S*ID

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Jeff Layton <[email protected]>

Don't allow unionfs_setattr to trip the BUG() in notify_change. Clear
ATTR_MODE if the either ATTR_KILL_S*ID is set. This also allows the
lower filesystem to interpret these bits in its own way.

Signed-off-by: Jeff Layton <[email protected]>
Cc: Josef 'Jeff' Sipek <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Erez Zadok <[email protected]>
---
 fs/unionfs/inode.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index 4e59ace..6ca52f4 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -1048,6 +1048,13 @@ static int unionfs_setattr(struct dentry *dentry, struct iattr *ia)
 	bend = dbend(dentry);
 	inode = dentry->d_inode;
 
+	/*
+	 * mode change is for clearing setuid/setgid. Allow lower filesystem
+	 * to reinterpret it in its own way.
+	 */
+	if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
+		ia->ia_valid &= ~ATTR_MODE;
+
 	for (bindex = bstart; (bindex <= bend) || (bindex == bstart);
 	     bindex++) {
 		lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
-- 
1.5.2.2

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux