Messages in this thread | | | Date | Thu, 3 Dec 2015 13:22:50 -0800 | Subject | Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs | From | Bjorn Andersson <> |
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On Thu, Dec 3, 2015 at 1:12 PM, Arnd Bergmann <arnd@arndb.de> wrote: > 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. >
It seems glibc might be the only libc implementation with this protection.
Regards, Bjorn
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