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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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2007-10-12 16:11:45 +02:00 committed by Martin Schwidefsky
parent 53a0868cb4
commit e39394b841
1 changed files with 10 additions and 3 deletions
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13
include/asm-s390/pgtable.h
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@ -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
/*