From: He Zhe <zhe.he@windriver.com>
To: oleg@redhat.com, catalin.marinas@arm.com, will@kernel.org,
linux-arm-kernel@lists.infradead.org, paul@paul-moore.com,
eparis@redhat.com, linux-audit@redhat.com,
linux-kernel@vger.kernel.org, zhe.he@windriver.com
Subject: [PATCH 2/3] arm64: syscall.h: Add sign extension handling in syscall_get_return_value for compat
Date: Fri, 16 Apr 2021 15:55:32 +0800 [thread overview]
Message-ID: <20210416075533.7720-2-zhe.he@windriver.com> (raw)
In-Reply-To: <20210416075533.7720-1-zhe.he@windriver.com>
Add sign extension handling in syscall_get_return_value so that it can
handle 32-bit compatible case and can be used by for example audit, just
like what syscall_get_error does.
Signed-off-by: He Zhe <zhe.he@windriver.com>
---
arch/arm64/include/asm/syscall.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
index cfc0672013f6..cd7a22787aeb 100644
--- a/arch/arm64/include/asm/syscall.h
+++ b/arch/arm64/include/asm/syscall.h
@@ -44,7 +44,12 @@ static inline long syscall_get_error(struct task_struct *task,
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
- return regs->regs[0];
+ long val = regs->regs[0];
+
+ if (is_compat_thread(task_thread_info(task)))
+ val = sign_extend64(val, 31);
+
+ return val;
}
static inline void syscall_set_return_value(struct task_struct *task,
--
2.17.1
--
Linux-audit mailing list
Linux-audit@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-audit
next prev parent reply other threads:[~2021-04-16 12:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-16 7:55 [PATCH 1/3] arm64: ptrace: Add is_syscall_success to handle compat He Zhe
2021-04-16 7:55 ` He Zhe [this message]
2021-04-16 9:43 ` [PATCH 2/3] arm64: syscall.h: Add sign extension handling in syscall_get_return_value for compat Oleg Nesterov
2021-04-20 8:38 ` He Zhe
2021-04-21 17:41 ` Mark Rutland
2021-04-22 16:55 ` Mark Rutland
2021-04-16 7:55 ` [PATCH 3/3] audit: Use syscall_get_return_value to get syscall return code in audit_syscall_exit He Zhe
2021-04-16 12:33 ` [PATCH 1/3] arm64: ptrace: Add is_syscall_success to handle compat Catalin Marinas
2021-04-16 13:34 ` Mark Rutland
2021-04-17 13:19 ` David Laight
2021-04-19 12:19 ` Will Deacon
2021-04-20 8:54 ` He Zhe
2021-04-21 17:10 ` Mark Rutland
2021-04-22 16:07 ` Will Deacon
2021-04-22 16:42 ` Mark Rutland
2021-04-22 18:57 ` Dmitry V. Levin
2021-04-20 8:42 ` He Zhe
2021-04-21 17:17 ` Mark Rutland
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