This is a note to let you know that I've just added the patch titled
arm64/sme: Always exit sme_alloc() early with existing storage
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:
arm64-sme-always-exit-sme_alloc-early-with-existing-storage.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.
>From dc7eb8755797ed41a0d1b5c0c39df3c8f401b3d9 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@xxxxxxxxxx>
Date: Mon, 15 Jan 2024 20:15:46 +0000
Subject: arm64/sme: Always exit sme_alloc() early with existing storage
From: Mark Brown <broonie@xxxxxxxxxx>
commit dc7eb8755797ed41a0d1b5c0c39df3c8f401b3d9 upstream.
When sme_alloc() is called with existing storage and we are not flushing we
will always allocate new storage, both leaking the existing storage and
corrupting the state. Fix this by separating the checks for flushing and
for existing storage as we do for SVE.
Callers that reallocate (eg, due to changing the vector length) should
call sme_free() themselves.
Fixes: 5d0a8d2fba50 ("arm64/ptrace: Ensure that SME is set up for target when writing SSVE state")
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240115-arm64-sme-flush-v1-1-7472bd3459b7@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/fpsimd.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -1280,8 +1280,10 @@ void fpsimd_release_task(struct task_str
*/
void sme_alloc(struct task_struct *task, bool flush)
{
- if (task->thread.sme_state && flush) {
- memset(task->thread.sme_state, 0, sme_state_size(task));
+ if (task->thread.sme_state) {
+ if (flush)
+ memset(task->thread.sme_state, 0,
+ sme_state_size(task));
return;
}
Patches currently in stable-queue which might be from broonie@xxxxxxxxxx are
queue-6.6/soundwire-fix-initializing-sysfs-for-same-devices-on.patch
queue-6.6/arm64-sme-always-exit-sme_alloc-early-with-existing-storage.patch
