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authorBjorn Andersson <bjorn.andersson@linaro.org>2019-04-17 21:29:29 -0700
committerCatalin Marinas <catalin.marinas@arm.com>2019-04-23 10:56:24 +0100
commitd4d18e3ec6091843f607e8929a56723e28f393a6 (patch)
treeebe9dab3dcc03344ca8f47f3b00e6c37242bde02 /arch
parent085b7755808aa11f78ab9377257e1dad2e6fa4bb (diff)
downloadlinux-d4d18e3ec6091843f607e8929a56723e28f393a6.tar.bz2
arm64: mm: Ensure tail of unaligned initrd is reserved
In the event that the start address of the initrd is not aligned, but has an aligned size, the base + size will not cover the entire initrd image and there is a chance that the kernel will corrupt the tail of the image. By aligning the end of the initrd to a page boundary and then subtracting the adjusted start address the memblock reservation will cover all pages that contains the initrd. Fixes: c756c592e442 ("arm64: Utilize phys_initrd_start/phys_initrd_size") Cc: stable@vger.kernel.org Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/mm/init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 6bc135042f5e..7cae155e81a5 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -363,7 +363,7 @@ void __init arm64_memblock_init(void)
* Otherwise, this is a no-op
*/
u64 base = phys_initrd_start & PAGE_MASK;
- u64 size = PAGE_ALIGN(phys_initrd_size);
+ u64 size = PAGE_ALIGN(phys_initrd_start + phys_initrd_size) - base;
/*
* We can only add back the initrd memory if we don't end up