This is a note to let you know that I've just added the patch titled
arm64/ptrace: Flush FP state when setting ZT0
to the 6.4-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-ptrace-flush-fp-state-when-setting-zt0.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 89a65c3f170e5c3b05a626046c68354e2afd7912 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@xxxxxxxxxx>
Date: Thu, 3 Aug 2023 01:19:06 +0100
Subject: arm64/ptrace: Flush FP state when setting ZT0
From: Mark Brown <broonie@xxxxxxxxxx>
commit 89a65c3f170e5c3b05a626046c68354e2afd7912 upstream.
When setting ZT0 via ptrace we do not currently force a reload of the
floating point register state from memory, do that to ensure that the newly
set value gets loaded into the registers on next task execution.
The function was templated off the function for FPSIMD which due to our
providing the option of embedding a FPSIMD regset within the SVE regset
does not directly include the flush.
Fixes: f90b529bcbe5 ("arm64/sme: Implement ZT0 ptrace support")
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230803-arm64-fix-ptrace-zt0-flush-v1-1-72e854eaf96e@xxxxxxxxxx
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/ptrace.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index d7f4f0d1ae12..740e81e9db04 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -1180,6 +1180,8 @@ static int zt_set(struct task_struct *target,
if (ret == 0)
target->thread.svcr |= SVCR_ZA_MASK;
+ fpsimd_flush_task_state(target);
+
return ret;
}
--
2.41.0
Patches currently in stable-queue which might be from broonie@xxxxxxxxxx are
queue-6.4/net-netsec-ignore-phy-mode-on-synquacer-in-dt-mode.patch
queue-6.4/arm64-ptrace-flush-fp-state-when-setting-zt0.patch
queue-6.4/arm64-fpsimd-sync-fpsimd-state-with-sve-for-sme-only-systems.patch
queue-6.4/arm64-fpsimd-clear-sme-state-in-the-target-task-when-setting-the-vl.patch
queue-6.4/arm64-ptrace-don-t-enable-sve-when-setting-streaming-sve.patch
queue-6.4/arm64-fpsimd-sync-and-zero-pad-fpsimd-state-for-streaming-sve.patch
