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Boy.Wu ee0ce7573e ARM: 9381/1: kasan: clear stale stack poison [ Upstream commit `c4238686f9` ] We found below OOB crash: [ 33.452494] ================================================================== [ 33.453513] BUG: KASAN: stack-out-of-bounds in refresh_cpu_vm_stats.constprop.0+0xcc/0x2ec [ 33.454660] Write of size 164 at addr c1d03d30 by task swapper/0/0 [ 33.455515] [ 33.455767] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G O 6.1.25-mainline #1 [ 33.456880] Hardware name: Generic DT based system [ 33.457555] unwind_backtrace from show_stack+0x18/0x1c [ 33.458326] show_stack from dump_stack_lvl+0x40/0x4c [ 33.459072] dump_stack_lvl from print_report+0x158/0x4a4 [ 33.459863] print_report from kasan_report+0x9c/0x148 [ 33.460616] kasan_report from kasan_check_range+0x94/0x1a0 [ 33.461424] kasan_check_range from memset+0x20/0x3c [ 33.462157] memset from refresh_cpu_vm_stats.constprop.0+0xcc/0x2ec [ 33.463064] refresh_cpu_vm_stats.constprop.0 from tick_nohz_idle_stop_tick+0x180/0x53c [ 33.464181] tick_nohz_idle_stop_tick from do_idle+0x264/0x354 [ 33.465029] do_idle from cpu_startup_entry+0x20/0x24 [ 33.465769] cpu_startup_entry from rest_init+0xf0/0xf4 [ 33.466528] rest_init from arch_post_acpi_subsys_init+0x0/0x18 [ 33.467397] [ 33.467644] The buggy address belongs to stack of task swapper/0/0 [ 33.468493] and is located at offset 112 in frame: [ 33.469172] refresh_cpu_vm_stats.constprop.0+0x0/0x2ec [ 33.469917] [ 33.470165] This frame has 2 objects: [ 33.470696] [32, 76) 'global_zone_diff' [ 33.470729] [112, 276) 'global_node_diff' [ 33.471294] [ 33.472095] The buggy address belongs to the physical page: [ 33.472862] page:3cd72da8 refcount:1 mapcount:0 mapping:00000000 index:0x0 pfn:0x41d03 [ 33.473944] flags: 0x1000(reserved\|zone=0) [ 33.474565] raw: 00001000 ed741470 ed741470 00000000 00000000 00000000 ffffffff 00000001 [ 33.475656] raw: 00000000 [ 33.476050] page dumped because: kasan: bad access detected [ 33.476816] [ 33.477061] Memory state around the buggy address: [ 33.477732] c1d03c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 33.478630] c1d03c80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 [ 33.479526] >c1d03d00: 00 04 f2 f2 f2 f2 00 00 00 00 00 00 f1 f1 f1 f1 [ 33.480415] ^ [ 33.481195] c1d03d80: 00 00 00 00 00 00 00 00 00 00 04 f3 f3 f3 f3 f3 [ 33.482088] c1d03e00: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 [ 33.482978] ================================================================== We find the root cause of this OOB is that arm does not clear stale stack poison in the case of cpuidle. This patch refer to arch/arm64/kernel/sleep.S to resolve this issue. From cited commit [1] that explain the problem Functions which the compiler has instrumented for KASAN place poison on the stack shadow upon entry and remove this poison prior to returning. In the case of cpuidle, CPUs exit the kernel a number of levels deep in C code. Any instrumented functions on this critical path will leave portions of the stack shadow poisoned. If CPUs lose context and return to the kernel via a cold path, we restore a prior context saved in __cpu_suspend_enter are forgotten, and we never remove the poison they placed in the stack shadow area by functions calls between this and the actual exit of the kernel. Thus, (depending on stackframe layout) subsequent calls to instrumented functions may hit this stale poison, resulting in (spurious) KASAN splats to the console. To avoid this, clear any stale poison from the idle thread for a CPU prior to bringing a CPU online. From cited commit [2] Extend to check for CONFIG_KASAN_STACK [1] commit `0d97e6d802` ("arm64: kasan: clear stale stack poison") [2] commit `d56a9ef84b` ("kasan, arm64: unpoison stack only with CONFIG_KASAN_STACK") Signed-off-by: Boy Wu <boy.wu@mediatek.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Andrey Ryabinin <ryabinin.a.a@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Fixes: `5615f69bc2` ("ARM: 9016/2: Initialize the mapping of KASan shadow memory") Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-05-17 12:02:20 +02:00
arch	ARM: 9381/1: kasan: clear stale stack poison	2024-05-17 12:02:20 +02:00
block	blk-iocost: do not WARN if iocg was already offlined	2024-05-17 12:02:20 +02:00
certs
crypto	crypto: jitter - fix CRYPTO_JITTERENTROPY help text	2024-03-26 18:19:52 -04:00
Documentation	mm, treewide: introduce NR_PAGE_ORDERS	2024-05-02 16:32:41 +02:00
drivers	qibfs: fix dentry leak	2024-05-17 12:02:20 +02:00
fs	fs/9p: drop inodes immediately on non-.L too	2024-05-17 12:02:19 +02:00
include	xfrm: Preserve vlan tags for transport mode software GRO	2024-05-17 12:02:20 +02:00
init	rust: make mutually exclusive with CFI_CLANG	2024-05-02 16:32:42 +02:00
io_uring	io_uring: Fix io_cqring_wait() not restoring sigmask on get_timespec64() failure	2024-04-27 17:11:30 +02:00
ipc
kernel	bpf: Check bloom filter map value size	2024-05-17 12:02:11 +02:00
lib	Fix a potential infinite loop in extract_user_to_sg()	2024-05-17 12:02:02 +02:00
LICENSES
mm	mm: turn folio_test_hugetlb into a PageType	2024-05-02 16:32:47 +02:00
net	xfrm: Preserve vlan tags for transport mode software GRO	2024-05-17 12:02:20 +02:00
rust	rust: kernel: require `Send` for `Module` implementations	2024-05-17 12:01:56 +02:00
samples	work around gcc bugs with 'asm goto' with outputs	2024-02-23 09:24:47 +01:00
scripts	kbuild: Disable KCSAN for autogenerated *.mod.c intermediaries	2024-05-17 12:02:12 +02:00
security	selinux: avoid dereference of garbage after mount failure	2024-04-10 16:35:48 +02:00
sound	ALSA: line6: Zero-initialize message buffers	2024-05-17 12:02:13 +02:00
tools	selftests: timers: Fix valid-adjtimex signed left-shift undefined behavior	2024-05-17 12:02:16 +02:00
usr
virt	KVM: Always flush async #PF workqueue when vCPU is being destroyed	2024-04-03 15:28:18 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
.rustfmt.toml
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	ALSA: scarlett2: Rename scarlett_gen2 to scarlett2	2024-04-27 17:11:36 +02:00
Makefile	Linux 6.6.30	2024-05-02 16:32:50 +02:00
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README

Linux kernel
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There are various text files in the Documentation/ subdirectory,
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Please read the Documentation/process/changes.rst file, as it contains the
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