xfrm_user: fix info leak in build_mapping()

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[ Upstream commit 1beb76b205 ]

struct xfrm_usersa_id has a one-byte padding hole after the proto
field, which ends up never getting set to zero before copying out to
userspace.  Fix that up by zeroing out the whole structure before
setting individual variables.

Fixes: 3a2dfbe8ac ("xfrm: Notify changes in UDP encapsulation via netlink")
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Simon Horman <horms@kernel.org>
Assisted-by: gregkh_clanker_t1000
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Greg Kroah-Hartman 2026-04-06 17:33:03 +02:00

parent 1a6051cd7e

commit c2779ae9a3

1 changed files with 1 additions and 0 deletions

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net/xfrm/xfrm_user.c

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