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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Russell: Kingly ping Thanks. Boy. On Fri, 2023-12-22 at 10:27 +0800, boy.wu wrote: > From: Boy Wu > > 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. > > Signed-off-by: Boy Wu > --- > arch/arm/kernel/sleep.S | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S > index a86a1d4f3461..93afd1005b43 100644 > --- a/arch/arm/kernel/sleep.S > +++ b/arch/arm/kernel/sleep.S > @@ -127,6 +127,10 @@ cpu_resume_after_mmu: > instr_sync > #endif > bl cpu_init @ restore the und/abt/irq > banked regs > +#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK) > + mov r0, sp > + bl kasan_unpoison_task_stack_below > +#endif > mov r0, #0 @ return zero on success > ldmfd sp!, {r4 - r11, pc} > ENDPROC(cpu_resume_after_mmu) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel