linux-kernel - Re: [PATCH v2 1/6] audit: Enable arm64 support

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Message-ID: <20140129223652.GA13702@madcap2.tricolour.ca>
Date:	Wed, 29 Jan 2014 17:36:52 -0500
From:	Richard Guy Briggs <rgb@...hat.com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	Will.Deacon@....com, arndb@...db.de, linux-kernel@...r.kernel.org,
	linux-audit@...hat.com, viro@...iv.linux.org.uk,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/6] audit: Enable arm64 support

On 14/01/29, Richard Guy Briggs wrote:
> On 14/01/27, AKASHI Takahiro wrote:
> > [To audit maintainers]
> > 
> > On 01/23/2014 11:18 PM, Catalin Marinas wrote:
> > >On Fri, Jan 17, 2014 at 08:13:14AM +0000, AKASHI Takahiro wrote:
> > >>--- a/include/uapi/linux/audit.h
> > >>+++ b/include/uapi/linux/audit.h
> > >>@@ -327,6 +327,8 @@ enum {
> > >>  /* distinguish syscall tables */
> > >>  #define __AUDIT_ARCH_64BIT 0x80000000
> > >>  #define __AUDIT_ARCH_LE	   0x40000000
> > >>+#define AUDIT_ARCH_AARCH64	(EM_AARCH64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
> > >>+#define AUDIT_ARCH_AARCH64EB	(EM_AARCH64|__AUDIT_ARCH_64BIT)
> > >>  #define AUDIT_ARCH_ALPHA	(EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
> > >>  #define AUDIT_ARCH_ARM		(EM_ARM|__AUDIT_ARCH_LE)
> > >>  #define AUDIT_ARCH_ARMEB	(EM_ARM)
> > >>diff --git a/init/Kconfig b/init/Kconfig
> > >>index 79383d3..3aae602 100644
> > >>--- a/init/Kconfig
> > >>+++ b/init/Kconfig
> > >>@@ -284,7 +284,7 @@ config AUDIT
> > >>
> > >>  config AUDITSYSCALL
> > >>  	bool "Enable system-call auditing support"
> > >>-	depends on AUDIT && (X86 || PARISC || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || (ARM && AEABI && !OABI_COMPAT))
> > >>+	depends on AUDIT && (X86 || PARISC || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || (ARM && AEABI && !OABI_COMPAT) || ARM64)
> > >
> > >The usual comment for such changes: could you please clean this up and
> > >just use something like "depends on HAVE_ARCH_AUDITSYSCALL"?
> > 
> > Do you agree to this change?
> > 
> > If so, I can create a patch, but have some concerns:
> > 1) I can't verify it on other architectures than (arm &) arm64.
> > 2) Some architectures (microblaze, mips, openrisc) are not listed here, but
> >    their ptrace.c have a call to audit_syscall_entry/exit().
> >    (audit_syscall_entry/exit are null if !AUDITSYSCALL, though)
> 
> I can try: ppc s390 x86_64 ppc64 i686 s390x

These arches above all pass compile and basic tests with the following patches applied:

	audit: correct a type mismatch in audit_syscall_exit() pending (already upstream)

	audit: Modify a set of system calls in audit class definitions (already upstream)

	[PATCH v3] audit: Add generic compat syscall support

	[PATCH v2] audit: Enable arm64 support
	[PATCH v2] arm64: Add regs_return_value() in syscall.h
	[PATCH v2] arm64: Add audit support
	[PATCH v2] arm64: audit: Add 32-bit (compat) syscall support
	[PATCH v2] arm64: audit: Add makefile rule to create unistd_32.h for compat syscalls
	[PATCH v2] arm64: audit: Add audit hook in ptrace/syscall_trace

> > So I'm afraid that the change might break someone's assumption.
> > 
> > Thanks,
> > -Takahiro AKASHI
> 
> - RGB

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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