linux-kernel - [PATCH v5 1/5] x86,x32,audit: Fix x32's AUDIT

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Message-Id: <a0138ed8c709882aec06e4acc30bfa9b623b8717.1409954077.git.luto@amacapital.net>
Date:	Fri,  5 Sep 2014 15:13:52 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
	Will Drewry <wad@...omium.org>, Oleg Nesterov <oleg@...hat.com>
Cc:	x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mips@...ux-mips.org, linux-arch@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Alexei Starovoitov <ast@...mgrid.com>, hpa@...or.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andy Lutomirski <luto@...capital.net>
Subject: [PATCH v5 1/5] x86,x32,audit: Fix x32's AUDIT_ARCH wrt audit

is_compat_task() is the wrong check for audit arch; the check should
be is_ia32_task(): x32 syscalls should be AUDIT_ARCH_X86_64, not
AUDIT_ARCH_I386.

CONFIG_AUDITSYSCALL is currently incompatible with x32, so this has
no visible effect.

Signed-off-by: Andy Lutomirski <luto@...capital.net>
---
 arch/x86/kernel/ptrace.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 93c182a00506..39296d25708c 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -1441,15 +1441,6 @@ void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
 	force_sig_info(SIGTRAP, &info, tsk);
 }
 
-
-#ifdef CONFIG_X86_32
-# define IS_IA32	1
-#elif defined CONFIG_IA32_EMULATION
-# define IS_IA32	is_compat_task()
-#else
-# define IS_IA32	0
-#endif
-
 /*
  * We must return the syscall number to actually look up in the table.
  * This can be -1L to skip running any syscall at all.
@@ -1487,7 +1478,7 @@ long syscall_trace_enter(struct pt_regs *regs)
 	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 		trace_sys_enter(regs, regs->orig_ax);
 
-	if (IS_IA32)
+	if (is_ia32_task())
 		audit_syscall_entry(AUDIT_ARCH_I386,
 				    regs->orig_ax,
 				    regs->bx, regs->cx,
-- 
1.9.3

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