On Thu, Dec 3, 2015 at 1:12 PM, Arnd Bergmann <a...@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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
