On Mon, Apr 01, 2019 at 12:30:14PM +0100, Vincenzo Frascino wrote:
Currently, compat tasks running on arm64 can allocate memory up to TASK_SIZE_32 (UL(0x100000000)).
This means that mmap() allocations, if we treat them as returning an array, are not compliant with the sections 6.5.8 of the C standard (C99) which states that: "If the expression P points to an element of an array object and the expression Q points to the last element of the same array object, the pointer expression Q+1 compares greater than P".
Redefine TASK_SIZE_32 to address the issue.
Cc: Catalin Marinas catalin.marinas@arm.com Cc: Will Deacon will.deacon@arm.com Cc: Jann Horn jannh@google.com Cc: stable@vger.kernel.org Reported-by: Jann Horn jannh@google.com Signed-off-by: Vincenzo Frascino vincenzo.frascino@arm.com
I'll queue this patch for -rc4.