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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-02-17 13:13:57 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-02-17 13:13:59 +0100 |
| commit | a8c8d7c683419d059e302373afc6998244f5f60f (patch) | |
| tree | 6c194395808bd1021a6f2ff3808e054e0c3f6b7f | |
| parent | 03e3b5a0f18c53560de1984fbbfca146d31da2a5 (diff) | |
| download | linux-a8c8d7c683419d059e302373afc6998244f5f60f.tar.gz linux-a8c8d7c683419d059e302373afc6998244f5f60f.tar.bz2 linux-a8c8d7c683419d059e302373afc6998244f5f60f.zip | |
[S390] correct ipl parameter block safe guard
The 'output' variable is passed from decompress_kernel to
check_ipl_parmblock before it is initialized. That disables the
safe guard against the overwrite of the ipl parameter block.
Fix this by passing the correct value to check_ipl_parmblock.
Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | arch/s390/boot/compressed/misc.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/s390/boot/compressed/misc.c b/arch/s390/boot/compressed/misc.c index 0851eb1e919e..2751b3a8a66f 100644 --- a/arch/s390/boot/compressed/misc.c +++ b/arch/s390/boot/compressed/misc.c @@ -133,11 +133,12 @@ unsigned long decompress_kernel(void) unsigned long output_addr; unsigned char *output; - check_ipl_parmblock((void *) 0, (unsigned long) output + SZ__bss_start); + output_addr = ((unsigned long) &_end + HEAP_SIZE + 4095UL) & -4096UL; + check_ipl_parmblock((void *) 0, output_addr + SZ__bss_start); memset(&_bss, 0, &_ebss - &_bss); free_mem_ptr = (unsigned long)&_end; free_mem_end_ptr = free_mem_ptr + HEAP_SIZE; - output = (unsigned char *) ((free_mem_end_ptr + 4095UL) & -4096UL); + output = (unsigned char *) output_addr; #ifdef CONFIG_BLK_DEV_INITRD /* |