FAILED: patch "[PATCH] io_uring: Fix io_cqring_wait() not restoring sigmask on" failed to apply to 6.1-stable tree

FAILED: patch "[PATCH] io_uring: Fix io_cqring_wait() not restoring sigmask on" failed to apply to 6.1-stable tree

[gregkh]

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 978e5c19dfefc271e5550efba92fcef0d3f62864
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024041502-handsaw-overpass-5b8a@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 978e5c19dfefc271e5550efba92fcef0d3f62864 Mon Sep 17 00:00:00 2001
From: Alexey Izbyshev <izbyshev@ispras.ru>
Date: Fri, 5 Apr 2024 15:55:51 +0300
Subject: [PATCH] io_uring: Fix io_cqring_wait() not restoring sigmask on
 get_timespec64() failure

This bug was introduced in commit 950e79dd7313 ("io_uring: minor
io_cqring_wait() optimization"), which was made in preparation for
adc8682ec690 ("io_uring: Add support for napi_busy_poll"). The latter
got reverted in cb3182167325 ("Revert "io_uring: Add support for
napi_busy_poll""), so simply undo the former as well.

Cc: stable@vger.kernel.org
Fixes: 950e79dd7313 ("io_uring: minor io_cqring_wait() optimization")
Signed-off-by: Alexey Izbyshev <izbyshev@ispras.ru>
Link: https://lore.kernel.org/r/20240405125551.237142-1-izbyshev@ispras.ru
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 4521c2b66b98..c170a2b8d2cf 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2602,19 +2602,6 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
 	if (__io_cqring_events_user(ctx) >= min_events)
 		return 0;
 
-	if (sig) {
-#ifdef CONFIG_COMPAT
-		if (in_compat_syscall())
-			ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig,
-						      sigsz);
-		else
-#endif
-			ret = set_user_sigmask(sig, sigsz);
-
-		if (ret)
-			return ret;
-	}
-
 	init_waitqueue_func_entry(&iowq.wq, io_wake_function);
 	iowq.wq.private = current;
 	INIT_LIST_HEAD(&iowq.wq.entry);
@@ -2633,6 +2620,19 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
 		io_napi_adjust_timeout(ctx, &iowq, &ts);
 	}
 
+	if (sig) {
+#ifdef CONFIG_COMPAT
+		if (in_compat_syscall())
+			ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig,
+						      sigsz);
+		else
+#endif
+			ret = set_user_sigmask(sig, sigsz);
+
+		if (ret)
+			return ret;
+	}
+
 	io_napi_busy_loop(ctx, &iowq);
 
 	trace_io_uring_cqring_wait(ctx, min_events);

Re: FAILED: patch "[PATCH] io_uring: Fix io_cqring_wait() not restoring sigmask on" failed to apply to 6.1-stable tree

[Jens Axboe]

[-- Attachment #1: Type: text/plain, Size: 820 bytes --]

On 4/15/24 6:36 AM, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 6.1-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
> 
> To reproduce the conflict and resubmit, you may use the following commands:
> 
> git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
> git checkout FETCH_HEAD
> git cherry-pick -x 978e5c19dfefc271e5550efba92fcef0d3f62864
> # <resolve conflicts, build, test, etc.>
> git commit -s
> git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024041502-handsaw-overpass-5b8a@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

And lastly, here's the 6.1-stable version.

-- 
Jens Axboe


[-- Attachment #2: 0001-io_uring-Fix-io_cqring_wait-not-restoring-sigmask-on.patch --]
[-- Type: text/x-patch, Size: 1912 bytes --]

From 69f86e86be3e44a2be3f79e0269fea50d4da3a93 Mon Sep 17 00:00:00 2001
From: Alexey Izbyshev <izbyshev@ispras.ru>
Date: Fri, 5 Apr 2024 15:55:51 +0300
Subject: [PATCH] io_uring: Fix io_cqring_wait() not restoring sigmask on
 get_timespec64() failure

Commit 978e5c19dfefc271e5550efba92fcef0d3f62864 upstream.

This bug was introduced in commit 950e79dd7313 ("io_uring: minor
io_cqring_wait() optimization"), which was made in preparation for
adc8682ec690 ("io_uring: Add support for napi_busy_poll"). The latter
got reverted in cb3182167325 ("Revert "io_uring: Add support for
napi_busy_poll""), so simply undo the former as well.

Cc: stable@vger.kernel.org
Fixes: 950e79dd7313 ("io_uring: minor io_cqring_wait() optimization")
Signed-off-by: Alexey Izbyshev <izbyshev@ispras.ru>
Link: https://lore.kernel.org/r/20240405125551.237142-1-izbyshev@ispras.ru
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/io_uring.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 68f1b6f8699a..958c3b619020 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2426,6 +2426,14 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
 			return 0;
 	} while (ret > 0);
 
+	if (uts) {
+		struct timespec64 ts;
+
+		if (get_timespec64(&ts, uts))
+			return -EFAULT;
+		timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
+	}
+
 	if (sig) {
 #ifdef CONFIG_COMPAT
 		if (in_compat_syscall())
@@ -2439,14 +2447,6 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
 			return ret;
 	}
 
-	if (uts) {
-		struct timespec64 ts;
-
-		if (get_timespec64(&ts, uts))
-			return -EFAULT;
-		timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
-	}
-
 	init_waitqueue_func_entry(&iowq.wq, io_wake_function);
 	iowq.wq.private = current;
 	INIT_LIST_HEAD(&iowq.wq.entry);
-- 
2.43.0

Re: FAILED: patch "[PATCH] io_uring: Fix io_cqring_wait() not restoring sigmask on" failed to apply to 6.1-stable tree

[Greg KH]

On Mon, Apr 15, 2024 at 10:17:10AM -0600, Jens Axboe wrote:
> On 4/15/24 6:36 AM, gregkh@linuxfoundation.org wrote:
> > 
> > The patch below does not apply to the 6.1-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@vger.kernel.org>.
> > 
> > To reproduce the conflict and resubmit, you may use the following commands:
> > 
> > git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
> > git checkout FETCH_HEAD
> > git cherry-pick -x 978e5c19dfefc271e5550efba92fcef0d3f62864
> > # <resolve conflicts, build, test, etc.>
> > git commit -s
> > git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024041502-handsaw-overpass-5b8a@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
> 
> And lastly, here's the 6.1-stable version.

All now queued up, thanks.

greg k-h