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tls: separate no-async decryption request handling from async

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commit 41532b785e upstream.

If we're not doing async, the handling is much simpler. There's no
reference counting, we just need to wait for the completion to wake us
up and return its result.

We should preferably also use a separate crypto_wait. I'm not seeing a
UAF as I did in the past, I think aec7961916 ("tls: fix race between
async notify and socket close") took care of it.

This will make the next fix easier.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/r/47bde5f649707610eaef9f0d679519966fc31061.1709132643.git.sd@queasysnail.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
[ William: The original patch did not apply cleanly due to deletions of
  non-existent lines in 6.1.y. The UAF the author stopped seeing can still
  be reproduced on systems without AVX in conjunction with cryptd.
  Also removed an extraneous statement after a return statement that is
  adjacent to diff. ]
Link: https://lore.kernel.org/netdev/he2K1yz_u7bZ-CnYcTSQ4OxuLuHZXN6xZRgp6_ICSWnq8J5FpI_uD1i_1lTSf7WMrYb5ThiX1OR2GTOB2IltgT49Koy7Hhutr4du4KtLvyk=@willsroot.io/
Signed-off-by: William Liu <will@willsroot.io>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sabrina Dubroca 2024-02-28 23:43:59 +01:00 committed by Greg Kroah-Hartman
parent 74c68b295b
commit 48905146d1
1 changed files with 7 additions and 2 deletions
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9
net/tls/tls_sw.c
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@ -274,9 +274,15 @@ static int tls_do_decryption(struct sock *sk,
DEBUG_NET_WARN_ON_ONCE(atomic_read(&ctx->decrypt_pending) < 1);
atomic_inc(&ctx->decrypt_pending);
} else {
DECLARE_CRYPTO_WAIT(wait);
aead_request_set_callback(aead_req,
CRYPTO_TFM_REQ_MAY_BACKLOG,
crypto_req_done, &ctx->async_wait);
crypto_req_done, &wait);
ret = crypto_aead_decrypt(aead_req);
if (ret == -EINPROGRESS || ret == -EBUSY)
ret = crypto_wait_req(ret, &wait);
return ret;
}
ret = crypto_aead_decrypt(aead_req);
@ -289,7 +295,6 @@ static int tls_do_decryption(struct sock *sk,
/* all completions have run, we're not doing async anymore */
darg->async = false;
return ret;
ret = ret ?: -EINPROGRESS;
}
atomic_dec(&ctx->decrypt_pending);