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Commit e39394b8 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 53a0868c

include/asm-s390/pgtable.h

+10 −3
Original line number Diff line number Diff line
@@ -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;



#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   (((unsigned long) high_memory + VMALLOC_OFFSET) \

			 & ~(VMALLOC_OFFSET-1))

#define VMALLOC_START	((VMALLOC_ADDR + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))

#define VMALLOC_END	vmalloc_end



/*