Mark Rutland 800cb2e553 arm64: kasan: avoid pfn_to_nid() before page array is initialized ... In arm64's kasan_init(), we use pfn_to_nid() to find the NUMA node a span of memory is in, hoping to allocate shadow from the same NUMA node. However, at this point, the page array has not been initialized, and thus this is bogus. Since commit: f165b378bb ("mm: uninitialized struct page poisoning sanity") ... accessing fields of the page array results in a boot time Oops(), highlighting this problem: [ 0.000000] Unable to handle kernel paging request at virtual address dfff200000000000 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000004 [ 0.000000] Exception class = DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000004 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] [dfff200000000000] address between user and kernel address ranges [ 0.000000] Internal error: Oops: 96000004 [#1] PREEMPT SMP [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.16.0-07317-gf165b378bbdf #42 [ 0.000000] Hardware name: ARM Juno development board (r1) (DT) [ 0.000000] pstate: 80000085 (Nzcv daIf -PAN -UAO) [ 0.000000] pc : __asan_load8+0x8c/0xa8 [ 0.000000] lr : __dump_page+0x3c/0x3b8 [ 0.000000] sp : ffff2000099b7ca0 [ 0.000000] x29: ffff2000099b7ca0 x28: ffff20000a1762c0 [ 0.000000] x27: ffff7e0000000000 x26: ffff2000099dd000 [ 0.000000] x25: ffff200009a3f960 x24: ffff200008f9c38c [ 0.000000] x23: ffff20000a9d3000 x22: ffff200009735430 [ 0.000000] x21: fffffffffffffffe x20: ffff7e0001e50420 [ 0.000000] x19: ffff7e0001e50400 x18: 0000000000001840 [ 0.000000] x17: ffffffffffff8270 x16: 0000000000001840 [ 0.000000] x15: 0000000000001920 x14: 0000000000000004 [ 0.000000] x13: 0000000000000000 x12: 0000000000000800 [ 0.000000] x11: 1ffff0012d0f89ff x10: ffff10012d0f89ff [ 0.000000] x9 : 0000000000000000 x8 : ffff8009687c5000 [ 0.000000] x7 : 0000000000000000 x6 : ffff10000f282000 [ 0.000000] x5 : 0000000000000040 x4 : fffffffffffffffe [ 0.000000] x3 : 0000000000000000 x2 : dfff200000000000 [ 0.000000] x1 : 0000000000000005 x0 : 0000000000000000 [ 0.000000] Process swapper (pid: 0, stack limit = 0x (ptrval)) [ 0.000000] Call trace: [ 0.000000] __asan_load8+0x8c/0xa8 [ 0.000000] __dump_page+0x3c/0x3b8 [ 0.000000] dump_page+0xc/0x18 [ 0.000000] kasan_init+0x2e8/0x5a8 [ 0.000000] setup_arch+0x294/0x71c [ 0.000000] start_kernel+0xdc/0x500 [ 0.000000] Code: aa0403e0 9400063c 17ffffee d343fc00 (38e26800) [ 0.000000] ---[ end trace 67064f0e9c0cc338 ]--- [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- Let's fix this by using early_pfn_to_nid(), as other architectures do in their kasan init code. Note that early_pfn_to_nid acquires the nid from the memblock array, which we iterate over in kasan_init(), so this should be fine. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Fixes: 39d114ddc6 ("arm64: add KASAN support") Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2018-04-17 16:16:59 +01:00
..
boot	ARM: SoC device tree updates for 4.17	2018-04-05 21:18:09 -07:00
configs	arm64: defconfig: add CONFIG_UNIPHIER_THERMAL and CONFIG_SNI_AVE	2018-03-27 15:31:19 +02:00
crypto	kbuild: mark $(targets) as .SECONDARY and remove .PRECIOUS markers	2018-04-07 19:04:02 +09:00
include	Additional arm64 updates for 4.17	2018-04-13 11:24:18 -07:00
kernel	arm64: assembler: add macros to conditionally yield the NEON under PREEMPT	2018-04-11 18:50:34 +01:00
kvm	arm64: Move the content of bpi.S to hyp-entry.S	2018-04-11 18:49:30 +01:00
lib	DeviceTree updates for 4.17:	2018-04-05 21:03:42 -07:00
mm	arm64: kasan: avoid pfn_to_nid() before page array is initialized	2018-04-17 16:16:59 +01:00
net	bpf, arm64: fix out of bounds access in tail call	2018-02-22 16:06:28 -08:00
xen	arm64: mm: Add additional parameter to uaccess_ttbr0_disable	2018-01-17 13:57:49 +01:00
Kconfig	ARM:	2018-04-09 11:42:31 -07:00
Kconfig.debug	arm64: relocation testing module	2017-04-04 17:03:32 +01:00
Kconfig.platforms	arm64: add Renesas R8A77965 support	2018-03-13 19:05:58 +01:00
Makefile	arm64/kernel: don't ban ADRP to work around Cortex-A53 erratum #843419	2018-03-09 13:21:53 +00:00