On Thu, 03 Dec 2015, Arnd Bergmann 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. Right. I have fixed the issue (and another one I found) anyway, if only to rid the GCC warning. -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
