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linux/drivers/acpi/apei
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Mauro Carvalho Chehab 242c652849 APEI/GHES: ARM processor Error: don't go past allocated memory 
[ Upstream commit 87880af2d2 ]

If the BIOS generates a very small ARM Processor Error, or
an incomplete one, the current logic will fail to deferrence

	err->section_length
and
	ctx_info->size

Add checks to avoid that. With such changes, such GHESv2
records won't cause OOPSes like this:

[    1.492129] Internal error: Oops: 0000000096000005 [#1]  SMP
[    1.495449] Modules linked in:
[    1.495820] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.18.0-rc1-00017-gabadcc3553dd-dirty #18 PREEMPT
[    1.496125] Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 02/02/2022
[    1.496433] Workqueue: kacpi_notify acpi_os_execute_deferred
[    1.496967] pstate: 814000c5 (Nzcv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
[    1.497199] pc : log_arm_hw_error+0x5c/0x200
[    1.497380] lr : ghes_handle_arm_hw_error+0x94/0x220

0xffff8000811c5324 is in log_arm_hw_error (../drivers/ras/ras.c:75).
70		err_info = (struct cper_arm_err_info *)(err + 1);
71		ctx_info = (struct cper_arm_ctx_info *)(err_info + err->err_info_num);
72		ctx_err = (u8 *)ctx_info;
73
74		for (n = 0; n < err->context_info_num; n++) {
75			sz = sizeof(struct cper_arm_ctx_info) + ctx_info->size;
76			ctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + sz);
77			ctx_len += sz;
78		}
79

and similar ones while trying to access section_length on an
error dump with too small size.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
[ rjw: Subject tweaks ]
Link: https://patch.msgid.link/7fd9f38413be05ee2d7cfdb0dc31ea2274cf1a54.1767871950.git.mchehab+huawei@kernel.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:20:54 -05:00
..
apei-base.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
apei-internal.h EINJ: Add CXL error type support 2024-03-12 23:08:29 -07:00
bert.c ACPI: APEI: mark bert_disable as __initdata 2023-06-12 19:23:25 +02:00
einj-core.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
einj-cxl.c EINJ, CXL: Fix CXL device SBDF calculation 2024-09-30 08:10:39 -05:00
erst-dbg.c [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
erst.c ACPI: APEI: Use ERST timeout for slow devices 2023-10-24 20:50:17 +02:00
ghes.c APEI/GHES: ARM processor Error: don't go past allocated memory 2026-03-04 07:20:54 -05:00
hest.c ACPI: APEI: Skip initialization of GHES_ASSIST structures for Machine Check Architecture 2024-02-29 18:34:40 +01:00
Kconfig firmware: SDEI: Allow sdei initialization without ACPI_APEI_GHES 2025-06-19 15:31:38 +02:00
Makefile EINJ: Add CXL error type support 2024-03-12 23:08:29 -07:00