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Old 01-03-2012, 12:14 PM
Andy Whitcroft
 
Default fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message

From: Miklos Szeredi <mszeredi@suse.cz>

FUSE_NOTIFY_INVAL_ENTRY didn't check the length of the write so the
message processing could overrun and result in a "kernel BUG at
fs/fuse/dev.c:629!"

Reported-by: Han-Wen Nienhuys <hanwenn@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: stable@kernel.org

(cherry picked from commit c2183d1e9b3f313dd8ba2b1b0197c8d9fb86a7ae)
CVE-2011-3353
BugLink: http://bugs.launchpad.net/bugs/905058
Signed-off-by: Andy Whitcroft <apw@canonical.com>
---
fs/fuse/dev.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index e5cdabf..517430a 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1208,6 +1208,10 @@ static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size,
if (outarg.namelen > FUSE_NAME_MAX)
goto err;

+ err = -EINVAL;
+ if (size != sizeof(outarg) + outarg.namelen + 1)
+ goto err;
+
name.name = buf;
name.len = outarg.namelen;
err = fuse_copy_one(cs, buf, outarg.namelen + 1);
--
1.7.5.4


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