This is a note to let you know that I've just added the patch titled
net: tls: fix use-after-free with partial reads and async decrypt
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-tls-fix-use-after-free-with-partial-reads-and-as.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bb2489d2136b70298909a60a58603f6b7b6684fd
Author: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Date: Tue Feb 6 17:18:22 2024 -0800
net: tls: fix use-after-free with partial reads and async decrypt
[ Upstream commit 32b55c5ff9103b8508c1e04bfa5a08c64e7a925f ]
tls_decrypt_sg doesn't take a reference on the pages from clear_skb,
so the put_page() in tls_decrypt_done releases them, and we trigger
a use-after-free in process_rx_list when we try to read from the
partially-read skb.
Fixes: fd31f3996af2 ("tls: rx: decrypt into a fresh skb")
Signed-off-by: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index c32fce6f3563..2af8b0873da6 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -63,6 +63,7 @@ struct tls_decrypt_ctx {
u8 iv[MAX_IV_SIZE];
u8 aad[TLS_MAX_AAD_SIZE];
u8 tail;
+ bool free_sgout;
struct scatterlist sg[];
};
@@ -187,7 +188,6 @@ static void tls_decrypt_done(void *data, int err)
struct aead_request *aead_req = data;
struct crypto_aead *aead = crypto_aead_reqtfm(aead_req);
struct scatterlist *sgout = aead_req->dst;
- struct scatterlist *sgin = aead_req->src;
struct tls_sw_context_rx *ctx;
struct tls_decrypt_ctx *dctx;
struct tls_context *tls_ctx;
@@ -224,7 +224,7 @@ static void tls_decrypt_done(void *data, int err)
}
/* Free the destination pages if skb was not decrypted inplace */
- if (sgout != sgin) {
+ if (dctx->free_sgout) {
/* Skip the first S/G entry as it points to AAD */
for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) {
if (!sg)
@@ -1583,6 +1583,7 @@ static int tls_decrypt_sg(struct sock *sk, struct iov_iter *out_iov,
} else if (out_sg) {
memcpy(sgout, out_sg, n_sgout * sizeof(*sgout));
}
+ dctx->free_sgout = !!pages;
/* Prepare and submit AEAD request */
err = tls_do_decryption(sk, sgin, sgout, dctx->iv,
