Catalin Marinas 2776e0e8ef arm64: kasan: Fix zero shadow mapping overriding kernel image shadow ... With the 16KB and 64KB page size configurations, SWAPPER_BLOCK_SIZE is PAGE_SIZE and ARM64_SWAPPER_USES_SECTION_MAPS is 0. Since kimg_shadow_end is not page aligned (_end shifted by KASAN_SHADOW_SCALE_SHIFT), the edges of previously mapped kernel image shadow via vmemmap_populate() may be overridden by subsequent calls to kasan_populate_zero_shadow(), leading to kernel panics like below: ------------------------------------------------------------------------------ Unable to handle kernel paging request at virtual address fffffc100135068c pgd = fffffc8009ac0000 [fffffc100135068c] *pgd=00000009ffee0003, *pud=00000009ffee0003, *pmd=00000009ffee0003, *pte=00e0000081a00793 Internal error: Oops: 9600004f [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.5.0-rc4+ #1984 Hardware name: Juno (DT) task: fffffe09001a0000 ti: fffffe0900200000 task.ti: fffffe0900200000 PC is at __memset+0x4c/0x200 LR is at kasan_unpoison_shadow+0x34/0x50 pc : [<fffffc800846f1cc>] lr : [<fffffc800821ff54>] pstate: 00000245 sp : fffffe0900203db0 x29: fffffe0900203db0 x28: 0000000000000000 x27: 0000000000000000 x26: 0000000000000000 x25: fffffc80099b69d0 x24: 0000000000000001 x23: 0000000000000000 x22: 0000000000002000 x21: dffffc8000000000 x20: 1fffff9001350a8c x19: 0000000000002000 x18: 0000000000000008 x17: 0000000000000147 x16: ffffffffffffffff x15: 79746972100e041d x14: ffffff0000000000 x13: ffff000000000000 x12: 0000000000000000 x11: 0101010101010101 x10: 1fffffc11c000000 x9 : 0000000000000000 x8 : fffffc100135068c x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : 0000000000000004 x3 : fffffc100134f651 x2 : 0000000000000400 x1 : 0000000000000000 x0 : fffffc100135068c Process swapper/0 (pid: 1, stack limit = 0xfffffe0900200020) Call trace: [<fffffc800846f1cc>] __memset+0x4c/0x200 [<fffffc8008220044>] __asan_register_globals+0x5c/0xb0 [<fffffc8008a09d34>] _GLOBAL__sub_I_65535_1_sunrpc_cache_lookup+0x1c/0x28 [<fffffc8008f20d28>] kernel_init_freeable+0x104/0x274 [<fffffc80089e1948>] kernel_init+0x10/0xf8 [<fffffc8008093a00>] ret_from_fork+0x10/0x50 ------------------------------------------------------------------------------ This patch aligns kimg_shadow_start and kimg_shadow_end to SWAPPER_BLOCK_SIZE in all configurations. Fixes: f9040773b7 ("arm64: move kernel image to base of vmalloc area") Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>		2016-03-11 11:03:35 +00:00
..
cache.S	arm64: Use PoU cache instr for I/D coherency	2015-12-17 11:07:13 +00:00
context.c	arm64: make mrs_s prefixing implicit in read_cpuid	2016-03-04 14:12:46 +00:00
copypage.c	arm64: Defer dcache flush in __cpu_copy_user_page	2015-12-17 11:07:13 +00:00
dma-mapping.c	arm64: add __init/__initdata section marker to some functions/variables	2015-12-02 12:17:11 +00:00
dump.c	arm64: mm: dump: Use VA_START directly instead of private LOWEST_ADDR	2016-02-26 18:31:41 +00:00
extable.c	arm64: switch to relative exception tables	2016-02-24 14:57:26 +00:00
fault.c	arm64: User die() instead of panic() in do_page_fault()	2016-02-19 14:28:58 +00:00
flush.c	arm64, thp: remove infrastructure for handling splitting PMDs	2016-01-15 17:56:32 -08:00
hugetlbpage.c	arm64: hugetlb: add support for PTE contiguous bit	2015-12-21 17:26:00 +00:00
init.c	arm64: mm: check at build time that PAGE_OFFSET divides the VA space evenly	2016-03-02 09:45:52 +00:00
ioremap.c	arm64: add ioremap physical address information	2015-01-23 15:29:06 +00:00
kasan_init.c	arm64: kasan: Fix zero shadow mapping overriding kernel image shadow	2016-03-11 11:03:35 +00:00
Makefile	arm64: add KASAN support	2015-10-12 17:46:36 +01:00
mm.h	arm64: add better page protections to arm64	2015-01-22 14:54:29 +00:00
mmap.c	arm64: mm: support ARCH_MMAP_RND_BITS	2016-01-14 16:00:49 -08:00
mmu.c	arm64: mm: Mark .rodata as RO	2016-02-26 15:08:04 +00:00
pageattr.c	arm64: Add support for ARCH_SUPPORTS_DEBUG_PAGEALLOC	2016-02-16 15:40:30 +00:00
pgd.c	arm64: mm: move pgd_cache initialisation to pgtable_cache_init	2016-01-05 15:43:10 +00:00
proc-macros.S	arm64: kernel: fix architected PMU registers unconditional access	2016-01-25 11:09:06 +00:00
proc.S	arm64: Add workaround for Cavium erratum 27456	2016-02-26 15:14:27 +00:00