This is a note to let you know that I've just added the patch titled
RISC-V: Align the shadow stack
to the 6.1-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:
risc-v-align-the-shadow-stack.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7b3019b70ca80a48c4e1aaff58f70ab286cce4ea
Author: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Date: Tue Nov 29 18:35:14 2022 -0800
RISC-V: Align the shadow stack
[ Upstream commit b003b3b77d65133a0011ae3b7b255347438c12f6 ]
The standard RISC-V ABIs all require 16-byte stack alignment. We're
only calling that one function on the shadow stack so I doubt it'd
result in a real issue, but might as well keep this lined up.
Fixes: 31da94c25aea ("riscv: add VMAP_STACK overflow detection")
Reviewed-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221130023515.20217-1-palmer@xxxxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 7abd8e4c4df6..f77cb8e42bd2 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -214,7 +214,7 @@ static DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)],
* shadow stack, handled_ kernel_ stack_ overflow(in kernel/entry.S) is used
* to get per-cpu overflow stack(get_overflow_stack).
*/
-long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)];
+long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)] __aligned(16);
asmlinkage unsigned long get_overflow_stack(void)
{
return (unsigned long)this_cpu_ptr(overflow_stack) +
