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tls: fix lockless read of strp->msg_ready in ->poll 

JIRA: https://issues.redhat.com/browse/RHEL-29306

commit 0844370f8945086eb9335739d10205dcea8d707b
Author: Sabrina Dubroca <sd@queasysnail.net>
Date:   Wed Apr 24 12:25:47 2024 +0200

    tls: fix lockless read of strp->msg_ready in ->poll

    tls_sk_poll is called without locking the socket, and needs to read
    strp->msg_ready (via tls_strp_msg_ready). Convert msg_ready to a bool
    and use READ_ONCE/WRITE_ONCE where needed. The remaining reads are
    only performed when the socket is locked.

    Fixes: 121dca784fc0 ("tls: suppress wakeups unless we have a full record")
    Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
    Link: https://lore.kernel.org/r/0b7ee062319037cf86af6b317b3d72f7bfcd2e97.1713797701.git.sd@queasysnail.net
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Sabrina Dubroca <sdubroca@redhat.com>
This commit is contained in:
Sabrina Dubroca 2024-05-01 17:48:15 +02:00
parent 87a07894fe
commit ad53885663
3 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/tls.h
View File

@ -113,7 +113,8 @@ struct tls_strparser {
u32 stopped : 1;
u32 copy_mode : 1;
u32 mixed_decrypted : 1;
u32 msg_ready : 1;
bool msg_ready;
struct strp_msg stm;

2
net/tls/tls.h
View File

@ -217,7 +217,7 @@ static inline struct sk_buff *tls_strp_msg(struct tls_sw_context_rx *ctx)
static inline bool tls_strp_msg_ready(struct tls_sw_context_rx *ctx)
{
return ctx->strp.msg_ready;
return READ_ONCE(ctx->strp.msg_ready);
}
static inline bool tls_strp_msg_mixed_decrypted(struct tls_sw_context_rx *ctx)

6
net/tls/tls_strp.c
View File

@ -360,7 +360,7 @@ static int tls_strp_copyin(read_descriptor_t *desc, struct sk_buff *in_skb,
if (strp->stm.full_len && strp->stm.full_len == skb->len) {
desc->count = 0;
strp->msg_ready = 1;
WRITE_ONCE(strp->msg_ready, 1);
tls_rx_msg_ready(strp);
}
@ -528,7 +528,7 @@ static int tls_strp_read_sock(struct tls_strparser *strp)
if (!tls_strp_check_queue_ok(strp))
return tls_strp_read_copy(strp, false);
strp->msg_ready = 1;
WRITE_ONCE(strp->msg_ready, 1);
tls_rx_msg_ready(strp);
return 0;
@ -580,7 +580,7 @@ void tls_strp_msg_done(struct tls_strparser *strp)
else
tls_strp_flush_anchor_copy(strp);
strp->msg_ready = 0;
WRITE_ONCE(strp->msg_ready, 0);
memset(&strp->stm, 0, sizeof(strp->stm));
tls_strp_check_rcv(strp);