From: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Prevent that modules get loaded at addresses below 4GB to prevent exchanging system call table entries. Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> --- include/asm-s390/pgtable.h | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) Index: quilt-2.6/include/asm-s390/pgtable.h =================================================================== --- quilt-2.6.orig/include/asm-s390/pgtable.h +++ quilt-2.6/include/asm-s390/pgtable.h @@ -107,11 +107,18 @@ extern char empty_zero_page[PAGE_SIZE]; * any out-of-bounds memory accesses will hopefully be caught. * The vmalloc() routines leaves a hole of 4kB between each vmalloced * area for the same reason. ;) + * vmalloc area starts at 4GB to prevent syscall table entry exchanging + * from modules. */ extern unsigned long vmalloc_end; -#define VMALLOC_OFFSET (8*1024*1024) -#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) \ - & ~(VMALLOC_OFFSET-1)) + +#ifdef CONFIG_64BIT +#define VMALLOC_ADDR (max(0x100000000UL, (unsigned long) high_memory)) +#else +#define VMALLOC_ADDR ((unsigned long) high_memory) +#endif +#define VMALLOC_OFFSET (8*1024*1024) +#define VMALLOC_START ((VMALLOC_ADDR + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) #define VMALLOC_END vmalloc_end /* -- blue skies, Martin. "Reality continues to ruin my life." - Calvin. - To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
