From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>,
"linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>,
Kees Cook <keescook@chromium.org>,
Catalin Marinas <Catalin.Marinas@arm.com>,
"arndb@arndb.de" <arndb@arndb.de>,
LKML <linux-kernel@vger.kernel.org>,
Deepak Saxena <dsaxena@linaro.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v6 2/6] arm64: ptrace: allow tracer to skip a system call
Date: Mon, 1 Sep 2014 12:47:51 +0100 [thread overview]
Message-ID: <20140901114751.GG30401@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <53FD72E2.4020103@linaro.org>
On Wed, Aug 27, 2014 at 02:55:46PM +0900, AKASHI Takahiro wrote:
> 1)
> setting x0 to -ENOSYS is necessary because, otherwise, user-issued syscall(-1) will
> return a bogus value when audit tracing is on.
>
> Please note that, on arm,
> not traced traced
> ------ ------
> syscall(-1) aborted OOPs(BUG_ON)
> syscall(-3000) aborted aborted
> syscall(1000) ENOSYS ENOSYS
Two points here:
1. You've found a case which causes a BUG_ON(). Where is the bug report
for this, so the problem can be investigated and resolved?
2. What do you mean by "aborted" ?
Please, if you find a problem with 32-bit ARM, report it. Don't hide it,
because hiding it can be a security issue or in the case of BUG_ON(), it
could be a denial of service issue.
As you're part of Linaro, I would have thought you'd be more responsible
in this regard - after all, Linaro is supposed to be about improving the
ARM kernel... Maybe I got that wrong, and Linaro is actually about
ensuring that the ARM kernel is stuffed full of broken features?
--
FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
according to speedtest.net.
WARNING: multiple messages have this Message-ID (diff)
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v6 2/6] arm64: ptrace: allow tracer to skip a system call
Date: Mon, 1 Sep 2014 12:47:51 +0100 [thread overview]
Message-ID: <20140901114751.GG30401@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <53FD72E2.4020103@linaro.org>
On Wed, Aug 27, 2014 at 02:55:46PM +0900, AKASHI Takahiro wrote:
> 1)
> setting x0 to -ENOSYS is necessary because, otherwise, user-issued syscall(-1) will
> return a bogus value when audit tracing is on.
>
> Please note that, on arm,
> not traced traced
> ------ ------
> syscall(-1) aborted OOPs(BUG_ON)
> syscall(-3000) aborted aborted
> syscall(1000) ENOSYS ENOSYS
Two points here:
1. You've found a case which causes a BUG_ON(). Where is the bug report
for this, so the problem can be investigated and resolved?
2. What do you mean by "aborted" ?
Please, if you find a problem with 32-bit ARM, report it. Don't hide it,
because hiding it can be a security issue or in the case of BUG_ON(), it
could be a denial of service issue.
As you're part of Linaro, I would have thought you'd be more responsible
in this regard - after all, Linaro is supposed to be about improving the
ARM kernel... Maybe I got that wrong, and Linaro is actually about
ensuring that the ARM kernel is stuffed full of broken features?
--
FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2014-09-01 11:48 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-21 8:56 [PATCH v6 0/6] arm64: add seccomp support AKASHI Takahiro
2014-08-21 8:56 ` AKASHI Takahiro
2014-08-21 8:56 ` [PATCH v6 1/6] arm64: ptrace: add PTRACE_SET_SYSCALL AKASHI Takahiro
2014-08-21 8:56 ` AKASHI Takahiro
2014-08-21 16:47 ` Kees Cook
2014-08-21 16:47 ` Kees Cook
2014-08-22 0:19 ` AKASHI Takahiro
2014-08-22 0:19 ` AKASHI Takahiro
2014-08-26 17:46 ` Will Deacon
2014-08-26 17:46 ` Will Deacon
2014-08-27 5:32 ` AKASHI Takahiro
2014-08-27 5:32 ` AKASHI Takahiro
2014-09-03 18:34 ` Kees Cook
2014-09-03 18:34 ` Kees Cook
2014-08-21 8:56 ` [PATCH v6 2/6] arm64: ptrace: allow tracer to skip a system call AKASHI Takahiro
2014-08-21 8:56 ` AKASHI Takahiro
2014-08-21 17:08 ` Kees Cook
2014-08-21 17:08 ` Kees Cook
2014-08-22 0:35 ` AKASHI Takahiro
2014-08-22 0:35 ` AKASHI Takahiro
2014-08-26 17:51 ` Will Deacon
2014-08-26 17:51 ` Will Deacon
2014-08-27 5:55 ` AKASHI Takahiro
2014-08-27 5:55 ` AKASHI Takahiro
2014-09-01 11:37 ` Will Deacon
2014-09-01 11:37 ` Will Deacon
2014-09-02 7:58 ` AKASHI Takahiro
2014-09-02 7:58 ` AKASHI Takahiro
2014-09-01 11:47 ` Russell King - ARM Linux [this message]
2014-09-01 11:47 ` Russell King - ARM Linux
2014-09-02 8:47 ` AKASHI Takahiro
2014-09-02 8:47 ` AKASHI Takahiro
2014-09-02 9:16 ` Russell King - ARM Linux
2014-09-02 9:16 ` Russell King - ARM Linux
2014-09-02 9:31 ` Russell King - ARM Linux
2014-09-02 9:31 ` Russell King - ARM Linux
2014-09-05 10:08 ` AKASHI Takahiro
2014-09-05 10:08 ` AKASHI Takahiro
2014-10-01 11:08 ` AKASHI Takahiro
2014-10-01 11:08 ` AKASHI Takahiro
2014-10-03 15:23 ` Will Deacon
2014-10-03 15:23 ` Will Deacon
2014-10-06 8:04 ` AKASHI Takahiro
2014-10-06 8:04 ` AKASHI Takahiro
2014-08-21 8:56 ` [PATCH v6 3/6] asm-generic: add generic seccomp.h for secure computing mode 1 AKASHI Takahiro
2014-08-21 8:56 ` AKASHI Takahiro
2014-08-21 17:51 ` Kees Cook
2014-08-21 17:51 ` Kees Cook
2014-08-22 0:38 ` AKASHI Takahiro
2014-08-22 0:38 ` AKASHI Takahiro
2014-08-21 8:56 ` [PATCH v6 4/6] arm64: add seccomp syscall for compat task AKASHI Takahiro
2014-08-21 8:56 ` AKASHI Takahiro
2014-08-21 17:52 ` Kees Cook
2014-08-21 17:52 ` Kees Cook
2014-08-22 0:39 ` AKASHI Takahiro
2014-08-22 0:39 ` AKASHI Takahiro
2014-08-26 17:53 ` Will Deacon
2014-08-26 17:53 ` Will Deacon
2014-08-27 5:57 ` AKASHI Takahiro
2014-08-27 5:57 ` AKASHI Takahiro
2014-08-21 8:56 ` [PATCH v6 5/6] arm64: add SIGSYS siginfo " AKASHI Takahiro
2014-08-21 8:56 ` AKASHI Takahiro
2014-08-21 17:54 ` Kees Cook
2014-08-21 17:54 ` Kees Cook
2014-08-22 0:44 ` AKASHI Takahiro
2014-08-22 0:44 ` AKASHI Takahiro
2014-08-26 17:55 ` Will Deacon
2014-08-26 17:55 ` Will Deacon
2014-08-27 5:58 ` AKASHI Takahiro
2014-08-27 5:58 ` AKASHI Takahiro
2014-08-21 8:56 ` [PATCH v6 6/6] arm64: add seccomp support AKASHI Takahiro
2014-08-21 8:56 ` AKASHI Takahiro
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