Message-ID: <535ED548.7000400@redhat.com>
Date:	Mon, 28 Apr 2014 18:25:12 -0400
From:	Don Dutile <ddutile@...hat.com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
CC:	viro@...iv.linux.org.uk, eparis@...hat.com, rgb@...hat.com,
	catalin.marinas@....com, will.deacon@....com,
	linaro-kernel@...ts.linaro.org, arndb@...db.de,
	linux-kernel@...r.kernel.org, dsaxena@...aro.org,
	linux-audit@...hat.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH_v8 0/2] arm64: Add audit support

On 04/28/2014 05:51 AM, AKASHI Takahiro wrote:
> Hi Don,
>
> Sorry for not responding to you soon:
>
been there, done that! .. no problem..

> On 04/12/2014 06:37 AM, Don Dutile wrote:
>> On 03/15/2014 01:49 AM, AKASHI Takahiro wrote:
>>> (Please apply this patch after my ftrace patch to resolve some conflict
>>> on arm64/kernel/ptrace.c, functionally it doesn't depend on ftrace though)
>>>
>>> This patchset adds system call audit support on arm64.
>>> Both 32-bit (AUDIT_ARCH_ARM) and 64-bit tasks (AUDIT_ARCH_AARCH64)
>>> are supported. Since arm64 has the exact same set of system calls
>>> on LE and BE, we don't care about endianness (or more specifically
>>> __AUDIT_ARCH_64BIT bit in AUDIT_ARCH_*).
>>>
>>> There are some prerequisites for this patch to work correctly:
>>> * "audit: Add CONFIG_HAVE_ARCH_AUDITSYSCALL" patch
>>> * "audit: generic compat system call audit support" patch
>>> * "arm64: __NR_* definitions for compat syscalls" patch from Catalin
>>> * "arm64: make a single hook to syscall_trace() for all syscall features" patch
>>> * "arm64: split syscall_trace() into separate functions for enter/exit" patch
>>> * "arm64: Add regs_return_value() in syscall.h" patch
>>> * "arm64: is_compat_task is defined both in asm/compat.h and
>>>     linux/compat.h" patch
>>> * userspace audit tool (v2.3.2 + my patch for arm64)
>>>
>> and the 2/2 patch won't apply to arch/arm64/kernel/ptrace.c
>> without the patch from  [PATCH v7 7/7] arm64: ftrace: Add system call tracepoint;
>> My question: do you need all 7 patches from arm64: Add ftrace support
>> as well for this audit patch to work, or just this 7/7 patch ?
>
> Functionally, my audit patch should work without ftrace patchset, but as described
> in ftrace's [0/7] and audit's [0/2], audit's [2/2] assumes that ftrace patchset, especially
> [7/7], has been applied in order to avoid any conflict when making changes on the same
> line of ptrace.c.
>
> Thanks,
> -Takahiro AKASHI
>
just a nit for others to see/know if they were having the same fun of
backporting these patches to work on an existing kernel w/o ftrace patch set.

>>
>>> Please review them as well for better understandings.
>>>
>>> This code was tested on both 32-bit and 64-bit LE userland
>>> in the following two ways:
>>> 1) basic operations with auditctl/autrace
>>>    # auditctl -a exit,always -S openat -F path=/etc/inittab
>>>    # auditctl -a exit,always -F dir=/tmp -F perm=rw
>>>    # auditctl -a task,always
>>>    # autrace /bin/ls
>>>      by comparing output from autrace with one from strace
>>>
>>> 2) audit-test-code (+ my workarounds for arm/arm64)
>>>    by running "audit-tool", "filter" and "syscalls" test categories.
>>>
>>> Changes v7 -> v8:
>>> * aligned with the change in "audit: generic compat system call audit
>>>    support" v5 [1/2]
>>> * aligned with the change in "arm64: split syscall_trace() into separate
>>>    functions for enter/exit" v5 [2/2]
>>>
>>> Changes v6 -> v7:
>>> * changed an include file in syscall.h from <linux/audit.h> to
>>>    <uapi/linux/audit.h> [1/2]
>>> * aligned with the patch, "arm64: split syscall_trace() into separate
>>>    functions for enter/exit" [2/2]
>>>
>>> Changes v5 -> v6:
>>> * removed and put "arm64: Add regs_return_value() in syscall.h" patch into
>>>    a separate set
>>> * aligned with the change in "arm64: make a single hook to syscall_trace()
>>>    for all syscall features" v3 [1/2]
>>>
>>> Changes v4 -> v5:
>>> * rebased to 3.14-rcX
>>> * added a guard against TIF_SYSCALL_AUDIT [3/3]
>>> * aligned with the change in "arm64: make a single hook to syscall_trace()
>>>    for all syscall features" v2 [3/3]
>>>
>>> Changes v3 -> v4:
>>> * Modified to sync with the patch, "make a single hook to syscall_trace()
>>>    for all syscall features"
>>> * aligned with "audit: Add CONFIG_HAVE_ARCH_AUDITSYSCALL" patch
>>>
>>> Changes v2 -> v3:
>>> * Remove asm/audit.h.
>>>    See "generic compat syscall audit support" patch v4
>>> * Remove endianness dependency, ie. AUDIT_ARCH_ARMEB/AARCH64EB.
>>> * Remove kernel/syscalls/Makefile which was used to create unistd32.h.
>>>    See Catalin's "Add __NR_* definitions for compat syscalls" patch
>>>
>>> Changes v1 -> v2:
>>> * Modified to utilize "generic compat system call audit" [3/6, 4/6, 5/6]
>>>    Please note that a required header, unistd_32.h, is automatically
>>>    generated from unistd32.h.
>>> * Refer to regs->orig_x0 instead of regs->x0 as the first argument of
>>>    system call in audit_syscall_entry() [6/6]
>>> * Include "Add regs_return_value() in syscall.h" patch [2/6],
>>>    which was not intentionally included in v1 because it could be added
>>>    by "kprobes support".
>>>
>>> AKASHI Takahiro (2):
>>>    arm64: Add audit support
>>>    arm64: audit: Add audit hook in syscall_trace_enter/exit()
>>>
>>>   arch/arm64/Kconfig               |  2 ++
>>>   arch/arm64/include/asm/syscall.h | 15 +++++++++++++++
>>>   arch/arm64/kernel/ptrace.c       |  7 +++++++
>>>   include/uapi/linux/audit.h       |  1 +
>>>   4 files changed, 25 insertions(+)
>>>
>>
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