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| author | Eric Sandeen <sandeen@redhat.com> | 2018-10-17 15:23:59 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-18 11:32:21 +0200 |
| commit | fa520c47eaa15b9baa8ad66ac18da4a31679693b (patch) | |
| tree | b5e4f0f10a806b70c69de4938466cb9cd78b6b16 | |
| parent | 1ff22883b0b2f7a73eb2609ffe879c9fd96f6328 (diff) | |
| download | linux-fa520c47eaa15b9baa8ad66ac18da4a31679693b.tar.bz2 | |
fscache: Fix out of bound read in long cookie keys
fscache_set_key() can incur an out-of-bounds read, reported by KASAN:
BUG: KASAN: slab-out-of-bounds in fscache_alloc_cookie+0x5b3/0x680 [fscache]
Read of size 4 at addr ffff88084ff056d4 by task mount.nfs/32615
and also reported by syzbot at https://lkml.org/lkml/2018/7/8/236
BUG: KASAN: slab-out-of-bounds in fscache_set_key fs/fscache/cookie.c:120 [inline]
BUG: KASAN: slab-out-of-bounds in fscache_alloc_cookie+0x7a9/0x880 fs/fscache/cookie.c:171
Read of size 4 at addr ffff8801d3cc8bb4 by task syz-executor907/4466
This happens for any index_key_len which is not divisible by 4 and is
larger than the size of the inline key, because the code allocates exactly
index_key_len for the key buffer, but the hashing loop is stepping through
it 4 bytes (u32) at a time in the buf[] array.
Fix this by calculating how many u32 buffers we'll need by using
DIV_ROUND_UP, and then using kcalloc() to allocate a precleared allocation
buffer to hold the index_key, then using that same count as the hashing
index limit.
Fixes: ec0328e46d6e ("fscache: Maintain a catalogue of allocated cookies")
Reported-by: syzbot+a95b989b2dde8e806af8@syzkaller.appspotmail.com
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/fscache/cookie.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c index b52f1dcd5dea..c550512ce335 100644 --- a/fs/fscache/cookie.c +++ b/fs/fscache/cookie.c @@ -70,7 +70,7 @@ void fscache_free_cookie(struct fscache_cookie *cookie) } /* - * Set the index key in a cookie. The cookie struct has space for a 12-byte + * Set the index key in a cookie. The cookie struct has space for a 16-byte * key plus length and hash, but if that's not big enough, it's instead a * pointer to a buffer containing 3 bytes of hash, 1 byte of length and then * the key data. @@ -80,10 +80,13 @@ static int fscache_set_key(struct fscache_cookie *cookie, { unsigned long long h; u32 *buf; + int bufs; int i; + bufs = DIV_ROUND_UP(index_key_len, sizeof(*buf)); + if (index_key_len > sizeof(cookie->inline_key)) { - buf = kzalloc(index_key_len, GFP_KERNEL); + buf = kcalloc(bufs, sizeof(*buf), GFP_KERNEL); if (!buf) return -ENOMEM; cookie->key = buf; @@ -98,7 +101,8 @@ static int fscache_set_key(struct fscache_cookie *cookie, */ h = (unsigned long)cookie->parent; h += index_key_len + cookie->type; - for (i = 0; i < (index_key_len + sizeof(u32) - 1) / sizeof(u32); i++) + + for (i = 0; i < bufs; i++) h += buf[i]; cookie->key_hash = h ^ (h >> 32); |