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Tengda Wu 92750bfe7b arm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth() ... [ Upstream commit 39dfc971e4 ] KASAN reports a stack-out-of-bounds read in regs_get_kernel_stack_nth(). Call Trace: [ 97.283505] BUG: KASAN: stack-out-of-bounds in regs_get_kernel_stack_nth+0xa8/0xc8 [ 97.284677] Read of size 8 at addr ffff800089277c10 by task 1.sh/2550 [ 97.285732] [ 97.286067] CPU: 7 PID: 2550 Comm: 1.sh Not tainted 6.6.0+ #11 [ 97.287032] Hardware name: linux,dummy-virt (DT) [ 97.287815] Call trace: [ 97.288279] dump_backtrace+0xa0/0x128 [ 97.288946] show_stack+0x20/0x38 [ 97.289551] dump_stack_lvl+0x78/0xc8 [ 97.290203] print_address_description.constprop.0+0x84/0x3c8 [ 97.291159] print_report+0xb0/0x280 [ 97.291792] kasan_report+0x84/0xd0 [ 97.292421] __asan_load8+0x9c/0xc0 [ 97.293042] regs_get_kernel_stack_nth+0xa8/0xc8 [ 97.293835] process_fetch_insn+0x770/0xa30 [ 97.294562] kprobe_trace_func+0x254/0x3b0 [ 97.295271] kprobe_dispatcher+0x98/0xe0 [ 97.295955] kprobe_breakpoint_handler+0x1b0/0x210 [ 97.296774] call_break_hook+0xc4/0x100 [ 97.297451] brk_handler+0x24/0x78 [ 97.298073] do_debug_exception+0xac/0x178 [ 97.298785] el1_dbg+0x70/0x90 [ 97.299344] el1h_64_sync_handler+0xcc/0xe8 [ 97.300066] el1h_64_sync+0x78/0x80 [ 97.300699] kernel_clone+0x0/0x500 [ 97.301331] __arm64_sys_clone+0x70/0x90 [ 97.302084] invoke_syscall+0x68/0x198 [ 97.302746] el0_svc_common.constprop.0+0x11c/0x150 [ 97.303569] do_el0_svc+0x38/0x50 [ 97.304164] el0_svc+0x44/0x1d8 [ 97.304749] el0t_64_sync_handler+0x100/0x130 [ 97.305500] el0t_64_sync+0x188/0x190 [ 97.306151] [ 97.306475] The buggy address belongs to stack of task 1.sh/2550 [ 97.307461] and is located at offset 0 in frame: [ 97.308257] __se_sys_clone+0x0/0x138 [ 97.308910] [ 97.309241] This frame has 1 object: [ 97.309873] [48, 184) 'args' [ 97.309876] [ 97.310749] The buggy address belongs to the virtual mapping at [ 97.310749] [ffff800089270000, ffff800089279000) created by: [ 97.310749] dup_task_struct+0xc0/0x2e8 [ 97.313347] [ 97.313674] The buggy address belongs to the physical page: [ 97.314604] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14f69a [ 97.315885] flags: 0x15ffffe00000000(node=1|zone=2|lastcpupid=0xfffff) [ 97.316957] raw: 015ffffe00000000 0000000000000000 dead000000000122 0000000000000000 [ 97.318207] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 [ 97.319445] page dumped because: kasan: bad access detected [ 97.320371] [ 97.320694] Memory state around the buggy address: [ 97.321511] ffff800089277b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 97.322681] ffff800089277b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 97.323846] >ffff800089277c00: 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 00 00 00 [ 97.325023] ^ [ 97.325683] ffff800089277c80: 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 [ 97.326856] ffff800089277d00: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 This issue seems to be related to the behavior of some gcc compilers and was also fixed on the s390 architecture before: commit d93a855c31 ("s390/ptrace: Avoid KASAN false positives in regs_get_kernel_stack_nth()") As described in that commit, regs_get_kernel_stack_nth() has confirmed that `addr` is on the stack, so reading the value at `*addr` should be allowed. Use READ_ONCE_NOCHECK() helper to silence the KASAN check for this case. Fixes: 0a8ea52c3e ("arm64: Add HAVE_REGS_AND_STACK_ACCESS_API feature") Signed-off-by: Tengda Wu <wutengda@huaweicloud.com> Link: https://lore.kernel.org/r/20250604005533.1278992-1-wutengda@huaweicloud.com [will: Use '*addr' as the argument to READ_ONCE_NOCHECK()] Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-06-27 11:05:38 +01:00
..
alpha	alpha/elf: Fix misc/setarch test of util-linux by removing 32bit support	2025-04-10 14:31:50 +02:00
arc	ARC: build: Try to guess GCC variant of cross compiler	2025-01-09 13:28:49 +01:00
arm	ARM: dts: am335x-bone-common: Increase MDIO reset deassert delay to 50ms	2025-06-27 11:05:36 +01:00
arm64	arm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth()	2025-06-27 11:05:38 +01:00
csky	csky, hexagon: fix broken sys_sync_file_range	2024-07-05 09:14:48 +02:00
h8300	h8300: Fix build errors from do_exit() to make_task_dead() transition	2023-02-01 08:27:21 +01:00
hexagon	hexagon: Fix unbalanced spinlock in die()	2025-03-13 12:50:14 +01:00
ia64	arch: Introduce CONFIG_FUNCTION_ALIGNMENT	2024-04-10 16:18:49 +02:00
m68k	m68k: mac: Fix macintosh_config for Mac II	2025-06-27 11:05:11 +01:00
microblaze	microblaze: don't treat zero reserved memory regions as error	2024-10-17 15:10:38 +02:00
mips	mips: Add -std= flag specified in KBUILD_CFLAGS to vdso CFLAGS	2025-06-27 11:05:27 +01:00
nds32	exit: Add and use make_task_dead.	2023-02-01 08:27:20 +01:00
nios2	nios2: force update_mmu_cache on spurious tlb-permission--related pagefaults	2025-06-27 11:05:30 +01:00
openrisc	openrisc: Call setup_memory() earlier in the init sequence	2024-09-04 13:23:27 +02:00
parisc	parisc: fix building with gcc-15	2025-06-27 11:05:26 +01:00
powerpc	powerpc/eeh: Fix missing PE bridge reconfiguration during VFIO EEH recovery	2025-06-27 11:05:33 +01:00
riscv	riscv: Avoid fortify warning in syscall_get_arguments()	2025-05-02 07:44:13 +02:00
s390	s390/pci: Fix __pcilg_mio_inuser() inline assembly	2025-06-27 11:05:38 +01:00
sh	sh: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK	2024-12-14 19:51:16 +01:00
sparc	sparc/mm: disable preemption in lazy mmu mode	2025-05-02 07:44:04 +02:00
um	um: let 'make clean' properly clean underlying SUBARCH as well	2025-06-04 14:38:08 +02:00
x86	Revert "x86/bugs: Make spectre user default depend on MITIGATION_SPECTRE_V2" on v6.6 and older	2025-06-27 11:05:33 +01:00
xtensa	xtensa: boot/lib: fix function prototypes	2023-10-06 13:18:14 +02:00
.gitignore	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
Kconfig	cpu: Re-enable CPU mitigations by default for !X86 architectures	2024-05-02 16:24:48 +02:00