linux-kernel - [PATCH 1/4] sh: Fix validation of system call number

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Message-Id: <20200722231322.419642-1-kernel@mkarcher.dialup.fu-berlin.de>
Date:   Thu, 23 Jul 2020 01:13:19 +0200
From:   Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
To:     linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
Subject: [PATCH 1/4] sh: Fix validation of system call number

The slow path for traced system call entries accessed a wrong memory
location to get the number of the maximum allowed system call number.
Renumber the numbered "local" label for the correct location to avoid
collisions with actual local labels.

Signed-off-by: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
---
 arch/sh/kernel/entry-common.S | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S
index 956a7a03b0c8..9bac5bbb67f3 100644
--- a/arch/sh/kernel/entry-common.S
+++ b/arch/sh/kernel/entry-common.S
@@ -199,7 +199,7 @@ syscall_trace_entry:
 	mov.l	@(OFF_R7,r15), r7   ! arg3
 	mov.l	@(OFF_R3,r15), r3   ! syscall_nr
 	!
-	mov.l	2f, r10			! Number of syscalls
+	mov.l	6f, r10			! Number of syscalls
 	cmp/hs	r10, r3
 	bf	syscall_call
 	mov	#-ENOSYS, r0
@@ -353,7 +353,7 @@ ENTRY(system_call)
 	tst	r9, r8
 	bf	syscall_trace_entry
 	!
-	mov.l	2f, r8			! Number of syscalls
+	mov.l	6f, r8			! Number of syscalls
 	cmp/hs	r8, r3
 	bt	syscall_badsys
 	!
@@ -392,7 +392,7 @@ syscall_exit:
 #if !defined(CONFIG_CPU_SH2)
 1:	.long	TRA
 #endif
-2:	.long	NR_syscalls
+6:	.long	NR_syscalls
 3:	.long	sys_call_table
 7:	.long	do_syscall_trace_enter
 8:	.long	do_syscall_trace_leave
-- 
2.28.0.rc1