tree 64bb811449dd09f596b2a2b6c5050a72087fe2ec
parent c5595fa2f1ce3c1a74dbd2ddc949257e80d81dc0
author Jan Harkes <jaharkes@cs.cmu.edu> 1441838281 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1441916941 -0700

fs/coda: fix readlink buffer overflow

Dan Carpenter discovered a buffer overflow in the Coda file system
readlink code.  A userspace file system daemon can return a 4096 byte
result which then triggers a one byte write past the allocated readlink
result buffer.

This does not trigger with an unmodified Coda implementation because Coda
has a 1024 byte limit for symbolic links, however other userspace file
systems using the Coda kernel module could be affected.

Although this is an obvious overflow, I don't think this has to be handled
as too sensitive from a security perspective because the overflow is on
the Coda userspace daemon side which already needs root to open Coda's
kernel device and to mount the file system before we get to the point that
links can be read.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>