From: He Zhe <zhe.he@windriver.com>
To: Kees Cook <keescook@chromium.org>
Cc: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com,
tglx@linutronix.de, bp@alien8.de, dave.hansen@linux.intel.com,
alexander.shishkin@linux.intel.com, jolsa@kernel.org,
namhyung@kernel.org, benh@kernel.crashing.org, paulus@samba.org,
borntraeger@linux.ibm.com, svens@linux.ibm.com, hpa@zytor.com,
x86@kernel.org, linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
linux-s390@vger.kernel.org, linux-perf-users@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC 2/8] arm64: stacktrace: Add arch_within_stack_frames
Date: Tue, 19 Apr 2022 22:01:11 +0800 [thread overview]
Message-ID: <b328bed3-ebb9-6fba-9585-79946262c40f@windriver.com> (raw)
In-Reply-To: <202204181457.9DE190CE@keescook>
On 4/19/22 05:59, Kees Cook wrote:
> On Mon, Apr 18, 2022 at 09:22:11PM +0800, He Zhe wrote:
>> This function checks if the given address range crosses frame boundary.
>> It is based on the existing x86 algorithm, but implemented via stacktrace.
>> This can be tested by USERCOPY_STACK_FRAME_FROM and
>> USERCOPY_STACK_FRAME_TO in lkdtm.
> Hi,
>
> Thanks for doing this implementation! One reason usercopy hardening
> didn't persue doing a "full" stacktrace was because it seemed relatively
> expensive. Did you do any usercopy-heavily workload testing to see if
> there was a noticeable performance impact?
>
> It would be nice to block the exposure of canaries and PAC bits, though,
> so I'm not opposed, but I'd like to get a better sense of how "heavy"
> this might be.
I just did some rough tests:
hackbench -s 512 -l 200 -g 15 -f 25 -P
Such line would hit arch_within_stack_frames at least 5000 times in my environment.
With hardened_usercopy=on, the execution time would be around 2.121 seconds(average for 30 times)
With hardened_usercopy=off, the execution time would be around 2.011 seconds(average for 30 times)
I'll test the original x86 way for arm64 tomorrow.
Any other workload needed to be run?
Thanks,
Zhe
>
> Thanks!
>
> -Kees
>
next prev parent reply other threads:[~2022-04-19 14:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-18 13:22 [PATCH RFC 0/8] hardened usercopy and stacktrace improvement He Zhe
2022-04-18 13:22 ` [PATCH RFC 1/8] stacktrace: Change callback prototype to pass more information He Zhe
2022-04-19 13:09 ` Mark Rutland
2022-04-19 14:13 ` He Zhe
2022-04-18 13:22 ` [PATCH RFC 2/8] arm64: stacktrace: Add arch_within_stack_frames He Zhe
2022-04-18 21:59 ` Kees Cook
2022-04-19 14:01 ` He Zhe [this message]
2022-04-20 7:32 ` David Laight
2022-04-19 14:40 ` Mark Rutland
2022-04-21 9:20 ` He Zhe
2022-04-18 13:22 ` [PATCH RFC 3/8] arm64: stacktrace: Make callbacks use new prototype with frame info He Zhe
2022-04-18 13:22 ` [PATCH RFC 4/8] powerpc: " He Zhe
2022-04-18 13:22 ` [PATCH RFC 5/8] riscv: " He Zhe
2022-04-18 13:22 ` [PATCH RFC 6/8] s390: " He Zhe
2022-04-18 13:22 ` [PATCH RFC 7/8] x86: " He Zhe
2022-04-18 13:22 ` [PATCH RFC 8/8] lkdtm: usercopy: Make USERCOPY_STACK_FRAME_x able to work for all archs He Zhe
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