Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 028d9b3c authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

[S390] Poison init section before freeing it. 



The data patterns should allow us to easily tell if somebody accesses
initdata/code after it was freed. Same code as on various other
architectures.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 39b742f9

arch/s390/mm/init.c

+2 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/pagemap.h>

#include <linux/bootmem.h>

#include <linux/pfn.h>

#include <linux/poison.h>



#include <asm/processor.h>

#include <asm/system.h>
@@ -187,6 +188,7 @@ void free_initmem(void) 
        for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {

		ClearPageReserved(virt_to_page(addr));

		init_page_count(virt_to_page(addr));

		memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);

		free_page(addr);

		totalram_pages++;

        }