Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs

From	Arnd Bergmann <arnd@arndb.de>
Newsgroups	linux.kernel
Subject	Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs
Date	2015-12-03 22:20 +0100
Message-ID	<qBJsf-1YU-31@gated-at.bofh.it> (permalink)
References	<qylFL-9v-1@gated-at.bofh.it> <qBC7n-5Es-5@gated-at.bofh.it> <qBFRE-879-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thursday 03 December 2015 17:28:30 Lee Jones wrote:
> > 
> > Ah, interesting. I haven't tried myself, and just tried to read the
> > code. Maybe glibc already catches zero-length writes before it gets
> > into the kernel, or I just missed the part of the syscall that checks
> > for this.
> 
> Glibc is responsible indeed:
>   
>   http://osxr.org/glibc/source/io/write.c

Ok, so an attacker can force the stack overflow by calling
syscall(__NR_write, fd, p, 0) if that has any potential value,
but normal users won't hit this case.

	Arnd
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Thread

Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote  processor using debugfs Lee Jones <lee.jones@linaro.org> - 2015-12-03 13:30 +0100
  Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs Arnd Bergmann <arnd@arndb.de> - 2015-12-03 13:50 +0100
    Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote  processor using debugfs Lee Jones <lee.jones@linaro.org> - 2015-12-03 14:10 +0100
      Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs Arnd Bergmann <arnd@arndb.de> - 2015-12-03 14:30 +0100
        Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote  processor using debugfs Lee Jones <lee.jones@linaro.org> - 2015-12-03 18:30 +0100
          Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs Arnd Bergmann <arnd@arndb.de> - 2015-12-03 22:20 +0100
            Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote  processor using debugfs Bjorn Andersson <bjorn@kryo.se> - 2015-12-03 22:30 +0100
            Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote  processor using debugfs Lee Jones <lee.jones@linaro.org> - 2015-12-04 09:30 +0100

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