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xfrm: enforce validity of offload input flags

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commit 7c76ecd9c99b6e9a771d813ab1aa7fa428b3ade1 upstream.

struct xfrm_user_offload has flags variable that received user input,
but kernel didn't check if valid bits were provided. It caused a situation
where not sanitized input was forwarded directly to the drivers.

For example, XFRM_OFFLOAD_IPV6 define that was exposed, was used by
strongswan, but not implemented in the kernel at all.

As a solution, check and sanitize input flags to forward
XFRM_OFFLOAD_INBOUND to the drivers.

Fixes: d77e38e612 ("xfrm: Add an IPsec hardware offloading API")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Leon Romanovsky
2022-02-08 16:14:32 +02:00
committed by Greg Kroah-Hartman
parent 2f0e6d80e8
commit b53d4bfd1a
2 changed files with 11 additions and 1 deletions
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6
include/uapi/linux/xfrm.h
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@@ -506,6 +506,12 @@ struct xfrm_user_offload {
int ifindex;
__u8 flags;
};
/* This flag was exposed without any kernel code that supporting it.
* Unfortunately, strongswan has the code that uses sets this flag,
* which makes impossible to reuse this bit.
*
* So leave it here to make sure that it won't be reused by mistake.
*/
#define XFRM_OFFLOAD_IPV6 1
#define XFRM_OFFLOAD_INBOUND 2