| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 003/121] af_key: Fix slab-out-of-bounds in pfkey_compile_policy. | Date | Wed, 11 Apr 2018 20:35:06 +0200 |
| |
3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Steffen Klassert <steffen.klassert@secunet.com>
[ Upstream commit d90c902449a7561f1b1d58ba5a0d11728ce8b0b2 ]
The sadb_x_sec_len is stored in the unit 'byte divided by eight'. So we have to multiply this value by eight before we can do size checks. Otherwise we may get a slab-out-of-bounds when we memcpy the user sec_ctx.
Fixes: df71837d502 ("[LSM-IPSec]: Security association restriction.") Reported-by: Andrey Konovalov <andreyknvl@google.com> Tested-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/key/af_key.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -3301,7 +3301,7 @@ static struct xfrm_policy *pfkey_compile p += pol->sadb_x_policy_len*8; sec_ctx = (struct sadb_x_sec_ctx *)p; if (len < pol->sadb_x_policy_len*8 + - sec_ctx->sadb_x_sec_len) { + sec_ctx->sadb_x_sec_len*8) { *dir = -EINVAL; goto out; }
|