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ACPI, APEI, EINJ: Refuse to inject into the zero page

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Some validation tests dynamically inject errors into memory used by
applications to check that the system can recover from a variety of
poison consumption sceenarios.

But sometimes the virtual address picked by these tests is mapped to
the zero page.

This causes additional unexpected machine checks as other processes that
map the zero page also consume the poison.

Disallow injection to the zero page.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Tony Luck 2022-04-19 14:19:21 -07:00 committed by Rafael J. Wysocki
parent a090931524
commit ab59c89396
1 changed files with 3 additions and 0 deletions
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3
drivers/acpi/apei/einj.c
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@ -549,6 +549,9 @@ static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
!arch_is_platform_page(base_addr)))
return -EINVAL;
if (is_zero_pfn(base_addr >> PAGE_SHIFT))
return -EADDRINUSE;
inject:
mutex_lock(&einj_mutex);
rc = __einj_error_inject(type, flags, param1, param2, param3, param4);