linux-kernel - [PATCH 0/2] ARM: set thread_info->syscall just before sys

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Date:	Sun, 11 Jan 2015 23:32:29 +0900
From:	Roman Pen <r.peniaev@...il.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Roman Pen <r.peniaev@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Sekhar Nori <nsekhar@...com>,
	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	Eric Paris <eparis@...hat.com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Marc Zyngier <marc.zyngier@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	stable@...r.kernel.org
Subject: [PATCH 0/2] ARM: set thread_info->syscall just before sys_* execution

Hello.

It turned out to be that on ARM 'syscall_get_nr' call and
corresponding userspace proc access '/proc/*/syscall' always
return 0 instead of correct syscall number:

 # cat /proc/*/syscall
 0 0xffffffff 0x0 0x0 0x0 0x0 0x0 0xbea33cc0 0xb6f32f2c
 0 0x5 0x16e99a8 0x0 0x0 0x0 0xbeec03b4 0xbeec02a0 0xb6cc85e0
 0 0x3 0xbeee5d44 0xbeee5d40 0xbeee5d40 0x0 0x0 0xbeee5d3c 0xb6ef40ac
 0 0xffffffff 0xbed757f8 0x2 0x0 0x2 0xbed757f8 0xbed757e0 0xb6e4af2c
 [snip]

Where first digit should be not 0, but correct syscall number.

The first patch fixes this and the second one does minor tweaks.

Roman Pen (2):
  ARM: entry-common: fix forgotten set of thread_info->syscall
  ARM: entry-common,ptrace: do not pass scno to syscall_trace_enter

 arch/arm/kernel/asm-offsets.c  | 1 +
 arch/arm/kernel/entry-common.S | 2 +-
 arch/arm/kernel/ptrace.c       | 6 ++++--
 3 files changed, 6 insertions(+), 3 deletions(-)

Signed-off-by: Roman Pen <r.peniaev@...il.com>
Cc: Russell King <linux@....linux.org.uk>
Cc: Christoffer Dall <christoffer.dall@...aro.org>
Cc: Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc: Sekhar Nori <nsekhar@...com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Eric Paris <eparis@...hat.com>
Cc: Will Deacon <will.deacon@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: stable@...r.kernel.org

-- 
2.1.3

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