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Date: Thu, 3 Dec 2015 13:22:50 -0800 From: Bjorn Andersson <bjorn@...o.se> To: Arnd Bergmann <arnd@...db.de> Cc: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, Lee Jones <lee.jones@...aro.org>, Ohad Ben-Cohen <ohad@...ery.com>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, Florian Fainelli <f.fainelli@...il.com>, kernel@...inux.com, Nathan Lynch <Nathan_Lynch@...tor.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, ludovic.barre@...com, Maxime Coquelin <maxime.coquelin@...com> Subject: Re: [RESEND v4 2/6] remoteproc: debugfs: Add ability to boot remote processor using debugfs On Thu, Dec 3, 2015 at 1:12 PM, Arnd Bergmann <arnd@...db.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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