[PATCH AUTOSEL 6.10 35/70] riscv: avoid Imbalance in RAS
Sasha Levin
sashal at kernel.org
Fri Oct 4 11:20:33 PDT 2024
From: Jisheng Zhang <jszhang at kernel.org>
[ Upstream commit 8f1534e7440382d118c3d655d3a6014128b2086d ]
Inspired by[1], modify the code to remove the code of modifying ra to
avoid imbalance RAS (return address stack) which may lead to incorret
predictions on return.
Link: https://lore.kernel.org/linux-riscv/20240607061335.2197383-1-cyrilbur@tenstorrent.com/ [1]
Signed-off-by: Jisheng Zhang <jszhang at kernel.org>
Reviewed-by: Cyril Bur <cyrilbur at tenstorrent.com>
Link: https://lore.kernel.org/r/20240720170659.1522-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer at rivosinc.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
arch/riscv/kernel/entry.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index 68a24cf9481af..d143dde853b51 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -232,8 +232,8 @@ SYM_CODE_START(ret_from_fork)
jalr s0
1:
move a0, sp /* pt_regs */
- la ra, ret_from_exception
- tail syscall_exit_to_user_mode
+ call syscall_exit_to_user_mode
+ j ret_from_exception
SYM_CODE_END(ret_from_fork)
#ifdef CONFIG_IRQ_STACKS
--
2.43.0
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