xfrm: Zero padding when dumping algos and encap

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[ Upstream commit 8222d5910d ]

When copying data to user-space we should ensure that only valid
data is copied over.  Padding in structures may be filled with
random (possibly sensitve) data and should never be given directly
to user-space.

This patch fixes the copying of xfrm algorithms and the encap
template in xfrm_user so that padding is zeroed.

Reported-by: syzbot+fa5414772d5c445dac3c@syzkaller.appspotmail.com
Reported-by: Hyunwoo Kim <v4bel@theori.io>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Herbert Xu 2023-02-09 09:09:52 +08:00 • committed by Greg Kroah-Hartman

parent 0369968654

commit 1a351e26cc

1 changed files with 41 additions and 4 deletions

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net/xfrm/xfrm_user.c

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