[PATCH 3.14 31/66] arm64: implement TASK_SIZE_OF

From: Greg Kroah-Hartman
Date: Tue Jul 15 2014 - 20:00:59 EST

3.14-stable review patch. If anyone has any objections, please let me know.


From: Colin Cross <ccross@xxxxxxxxxxx>

commit fa2ec3ea10bd377f9d55772b1dab65178425a1a2 upstream.

include/linux/sched.h implements TASK_SIZE_OF as TASK_SIZE if it
is not set by the architecture headers. TASK_SIZE uses the
current task to determine the size of the virtual address space.
On a 64-bit kernel this will cause reading /proc/pid/pagemap of a
64-bit process from a 32-bit process to return EOF when it reads
past 0xffffffff.

Implement TASK_SIZE_OF exactly the same as TASK_SIZE with
test_tsk_thread_flag instead of test_thread_flag.

Signed-off-by: Colin Cross <ccross@xxxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

arch/arm64/include/asm/memory.h | 2 ++
1 file changed, 2 insertions(+)

--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -56,6 +56,8 @@
#define TASK_SIZE_32 UL(0x100000000)
#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
+#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
#endif /* CONFIG_COMPAT */

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