On Wed, Mar 7, 2018 at 4:39 PM, Andrey Ryabinin <aryabi...@virtuozzo.com> wrote: > On 03/06/2018 08:58 PM, Will Deacon wrote: >> Hi all, >> >> As part of some recent work to harden the Kernel Address Space Layout >> Randomisation (KASLR) implementation in arm64 Linux, I've proposed a >> patch for the kernel which omits the ESR context from the signal frame >> if the faulting virtual address is outside the range of addresses which >> can be mapped by userspace. >> >> http://lists.infradead.org/pipermail/linux-arm-kernel/2018-March/563837.html >> >> Looking around, it seems that AddressSanitizer is using this information >> in compiler-rt in order to distinguish the faulting access type between >> READ, WRITE or UNKNOWN. With this change, all attempted accesses to kernel >> memory from userspace will be reported as UNKNOWN. >> >> Is this likely to cause a problem? > > I guess this shouldn't be a bid deal. > AFAICS compiler-rt uses this information only in diagnostic message.
+address-sanitizer mailing list Hi, These diagnostic messages are then parsed and analyzed, and access type is used at least during automatic security pre-assessment. Being capable to read arbitrary memory is different from being able to write arbitrary memory. Though, I don't know how we treat UNKNOWN. If it's the same as WRITE, then it's probably fine. -- You received this message because you are subscribed to the Google Groups "address-sanitizer" group. To unsubscribe from this group and stop receiving emails from it, send an email to address-sanitizer+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
