Commit f4039999 authored May 13, 2019 by Mike Rapoport Committed by Linus Torvalds May 14, 2019

init: free_initmem: poison freed init memory

Various architectures including x86 poison the freed init memory.  Do the
same in the generic free_initmem implementation and switch sparc32
architecture that is identical to the generic code over to it now.

Link: http://lkml.kernel.org/r/1550515285-17446-4-git-send-email-rppt@linux.ibm.com


Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 522c9919

arch/sparc/mm/init_32.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -294,11 +294,6 @@ void __init mem_init(void)
		mem_init_print_info(NULL);
		}

		void free_initmem (void)
		{
		free_initmem_default(POISON_FREE_INITMEM);
		}

		void sparc_flush_page_to_ram(struct page *page)
		{
		unsigned long vaddr = (unsigned long)page_address(page);

init/main.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1076,7 +1076,7 @@ static inline void mark_readonly(void)

		void __weak free_initmem(void)
		{
		free_initmem_default(-1);
		free_initmem_default(POISON_FREE_INITMEM);
		}

		static int __ref kernel_init(void *unused)