[PATCH 8/8] initramfs: poison freed initrd memory
From: Christoph Hellwig <hch@lst.de>
Date: 2019-02-13 17:47:05
Also in:
linux-arch, linux-mm, lkml
Subsystem:
filesystems (vfs and infrastructure), mips, s390 architecture, sparc + ultrasparc (sparc/sparc64), the rest · Maintainers:
Alexander Viro, Christian Brauner, Thomas Bogendoerfer, Heiko Carstens, Vasily Gorbik, Alexander Gordeev, "David S. Miller", Andreas Larsson, Linus Torvalds
Various architectures including x86 poison the freed initrd memory. Do the same in the generic free_initrd_mem implementation and switch a few more architectures that are identical to the generic code over to it now. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/mips/mm/init.c | 8 -------- arch/s390/mm/init.c | 8 -------- arch/sparc/mm/init_32.c | 8 -------- arch/sparc/mm/init_64.c | 8 -------- init/initramfs.c | 3 ++- 5 files changed, 2 insertions(+), 33 deletions(-)
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index b521d8e2d359..a9a977d75838 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c@@ -492,14 +492,6 @@ void free_init_pages(const char *what, unsigned long begin, unsigned long end) printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); } -#ifdef CONFIG_BLK_DEV_INITRD -void free_initrd_mem(unsigned long start, unsigned long end) -{ - free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, - "initrd"); -} -#endif - void (*free_init_pages_eva)(void *begin, void *end) = NULL; void __ref free_initmem(void)
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 3e82f66d5c61..25e3113091ea 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c@@ -154,14 +154,6 @@ void free_initmem(void) free_initmem_default(POISON_FREE_INITMEM); } -#ifdef CONFIG_BLK_DEV_INITRD -void __init free_initrd_mem(unsigned long start, unsigned long end) -{ - free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, - "initrd"); -} -#endif - unsigned long memory_block_size_bytes(void) { /*
diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
index d900952bfc5f..f0dbc0bde70f 100644
--- a/arch/sparc/mm/init_32.c
+++ b/arch/sparc/mm/init_32.c@@ -299,14 +299,6 @@ void free_initmem (void) free_initmem_default(POISON_FREE_INITMEM); } -#ifdef CONFIG_BLK_DEV_INITRD -void free_initrd_mem(unsigned long start, unsigned long end) -{ - free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, - "initrd"); -} -#endif - void sparc_flush_page_to_ram(struct page *page) { unsigned long vaddr = (unsigned long)page_address(page);
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index b4221d3727d0..4179f0e11fd5 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c@@ -2602,14 +2602,6 @@ void free_initmem(void) } } -#ifdef CONFIG_BLK_DEV_INITRD -void free_initrd_mem(unsigned long start, unsigned long end) -{ - free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, - "initrd"); -} -#endif - pgprot_t PAGE_KERNEL __read_mostly; EXPORT_SYMBOL(PAGE_KERNEL);
diff --git a/init/initramfs.c b/init/initramfs.c
index f3aaa58ac63d..4a42ff3a2bd1 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c@@ -529,7 +529,8 @@ extern unsigned long __initramfs_size; void __weak free_initrd_mem(unsigned long start, unsigned long end) { - free_reserved_area((void *)start, (void *)end, -1, "initrd"); + free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, + "initrd"); } #ifdef CONFIG_KEXEC_CORE
--
2.20.1
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