Commit 761cdf6a authored by Heiko Carstens's avatar Heiko Carstens
Browse files

[S390] initrd vs bss section clearing.



In case the initrd is located within the bss section it will be
overwritten when the section is cleared. To prevent this just move
the initrd right behind the bss section if it starts within the
section.
The current code already moves the initrd if the bootmem allocator
bitmap would overwrite it. With this patch we should be safe against
initrd corruptions.

Cc: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 63506c41
...@@ -380,6 +380,23 @@ static __init void detect_machine_facilities(void) ...@@ -380,6 +380,23 @@ static __init void detect_machine_facilities(void)
#endif #endif
} }
static __init void rescue_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
/*
* Move the initrd right behind the bss section in case it starts
* within the bss section. So we don't overwrite it when the bss
* section gets cleared.
*/
if (!INITRD_START || !INITRD_SIZE)
return;
if (INITRD_START >= (unsigned long) __bss_stop)
return;
memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
INITRD_START = (unsigned long) __bss_stop;
#endif
}
/* /*
* Save ipl parameters, clear bss memory, initialize storage keys * Save ipl parameters, clear bss memory, initialize storage keys
* and create a kernel NSS at startup if the SAVESYS= parm is defined * and create a kernel NSS at startup if the SAVESYS= parm is defined
...@@ -389,6 +406,7 @@ void __init startup_init(void) ...@@ -389,6 +406,7 @@ void __init startup_init(void)
unsigned long long memsize; unsigned long long memsize;
ipl_save_parameters(); ipl_save_parameters();
rescue_initrd();
clear_bss_section(); clear_bss_section();
init_kernel_storage_key(); init_kernel_storage_key();
lockdep_init(); lockdep_init();
......
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