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net: sock_diag: Fix spectre v1 gadget in __sock_diag_cmd()

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req->sdiag_family is a user-controlled value that's used as an array
index. Sanitize it after the bounds check to avoid speculative
out-of-bounds array access.

This also protects the sock_is_registered() call, so this removes the
sanitize call there.

Fixes: e978de7a6d ("net: socket: Fix potential spectre v1 gadget in sock_is_registered")
Cc: Josh Poimboeuf <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Jeremy Cline <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Jeremy Cline 2018-08-13 22:23:13 +00:00 • committed by David S. Miller
commit 66b51b0a03
2 changed files with 3 additions and 2 deletions
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3
net/socket.c
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@ -2697,8 +2697,7 @@ EXPORT_SYMBOL(sock_unregister);
bool sock_is_registered(int family)
{
return family < NPROTO &&
rcu_access_pointer(net_families[array_index_nospec(family, NPROTO)]);
return family < NPROTO && rcu_access_pointer(net_families[family]);
}
static int __init sock_init(void)