From: Pi-Hsun Shih <pihsun@chromium.org>
To: unlisted-recipients:; (no To-header on input)
Cc: Pi-Hsun Shih <pihsun@chromium.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Dominik Brodowski <linux@dominikbrodowski.net>,
Dave Martin <dave.martin@arm.com>,
linux-arm-kernel@lists.infradead.org (moderated list:ARM64 PORT
(AARCH64 ARCHITECTURE)), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] arm64: Mirror arm for small unimplemented compat syscalls
Date: Thu, 3 Jan 2019 15:45:47 +0800 [thread overview]
Message-ID: <20190103074550.217421-1-pihsun@chromium.org> (raw)
For syscall number smaller than 0xf0000, arm calls sys_ni_syscall
instead of arm_syscall in arch/arm/kernel/entry-common.S, which returns
-ENOSYS instead of raising SIGILL. Mirror this behavior for compat
syscalls in arm64.
Fixes: 532826f3712b607 ("arm64: Mirror arm for unimplemented compat
syscalls")
Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
---
arch/arm64/kernel/syscall.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c
index 8f3371415642ad..95fd8c7ec8a171 100644
--- a/arch/arm64/kernel/syscall.c
+++ b/arch/arm64/kernel/syscall.c
@@ -21,7 +21,7 @@ asmlinkage long do_ni_syscall(struct pt_regs *regs)
{
#ifdef CONFIG_COMPAT
long ret;
- if (is_compat_task()) {
+ if (is_compat_task() && regs->regs[7] >= __ARM_NR_COMPAT_BASE) {
ret = compat_arm_syscall(regs);
if (ret != -ENOSYS)
return ret;
--
2.20.1.415.g653613c723-goog
next reply other threads:[~2019-01-03 7:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-03 7:45 Pi-Hsun Shih [this message]
2019-01-03 11:50 ` Dave Martin
2019-01-03 16:51 ` Will Deacon
2019-01-03 17:52 ` Will Deacon
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