From e39394b84156bc0822785e379977fe75a5662aad Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Fri, 12 Oct 2007 16:11:45 +0200 Subject: [PATCH] [S390] Make vmalloc area start at address > 4GB. Prevent that modules get loaded at addresses below 4GB to prevent exchanging system call table entries. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- include/asm-s390/pgtable.h | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h index 3208dc6c412c..39bb5192dc31 100644 --- a/include/asm-s390/pgtable.h +++ b/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 /* -- 2.34.1