s390/mm: limit STACK_RND_MASK for compat tasks

For compat tasks the mmap randomization does not use the maximum randomization value from mmap_rnd_mask but the fixed value of 0x7ff. This needs to be respected in the definition of STACK_RND_MASK as well. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
mariux64 · Mar 13, 2015 · e143fa9 · e143fa9
1 parent 20e76ee
commit e143fa9
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/arch/s390/include/asm/elf.h b/arch/s390/include/asm/elf.h
@@ -211,7 +211,7 @@ do {								\
 
 extern unsigned long mmap_rnd_mask;
 
-#define STACK_RND_MASK	(mmap_rnd_mask)
+#define STACK_RND_MASK	(test_thread_flag(TIF_31BIT) ? 0x7ff : mmap_rnd_mask)
 
 #define ARCH_DLINFO							    \
 do {									    \