arm64: compat: Reduce address limit

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 <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: <[email protected]>
Reported-by: Jann Horn <[email protected]>
Signed-off-by: Vincenzo Frascino <[email protected]>
[will: fixed typo in comment]
Signed-off-by: Will Deacon <[email protected]>

0 files changed, 0 insertions, 0 deletions