Messages in this thread Patch in this message | | | From | Alexander Kuleshov <> | Subject | [PATCH] x86/KASLR: move aligning of minimal address to choose_random_location() | Date | Thu, 4 Jan 2018 15:54:21 +0600 |
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we align minimal possible address during randomization to CONFIG_PHYSICAL_ALIGN two times: during getting of random physical address and virtual address (only for x86_64).
Let's move this to choose_random_location() to not duplicate code in find_random_virt_addr() and find_random_phys_addr().
Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com> --- arch/x86/boot/compressed/kaslr.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c index 8199a6187251..8c93e399fdfd 100644 --- a/arch/x86/boot/compressed/kaslr.c +++ b/arch/x86/boot/compressed/kaslr.c @@ -673,9 +673,6 @@ static unsigned long find_random_phys_addr(unsigned long minimum, return 0; } - /* Make sure minimum is aligned. */ - minimum = ALIGN(minimum, CONFIG_PHYSICAL_ALIGN); - if (process_efi_entries(minimum, image_size)) return slots_fetch_random(); @@ -688,8 +685,6 @@ static unsigned long find_random_virt_addr(unsigned long minimum, { unsigned long slots, random_addr; - /* Make sure minimum is aligned. */ - minimum = ALIGN(minimum, CONFIG_PHYSICAL_ALIGN); /* Align image_size for easy slot calculations. */ image_size = ALIGN(image_size, CONFIG_PHYSICAL_ALIGN); @@ -738,6 +733,9 @@ void choose_random_location(unsigned long input, */ min_addr = min(*output, 512UL << 20); + /* Make sure minimum is aligned. */ + min_addr = ALIGN(min_addr, CONFIG_PHYSICAL_ALIGN); + /* Walk available memory entries to find a random address. */ random_addr = find_random_phys_addr(min_addr, output_size); if (!random_addr) { -- 2.14.3
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