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ACPI: APEI: Fix possible out-of-bounds access to BERT region 

Check that the length recorded in the generic error status block is
within the region before checking the contents of the region itself.

Otherwise it may result in an out-of-bounds access if the system
firmware has generated a status block with an invalid length (larger
than the mapped region). Also move the block_status check so that it
only happens after the block has been verified to be within the mapped
region.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Borislav Petkov <bp@suse.de>
Tested-by: Tyler Baicar <baicar.tyler@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ross Lagerwall 2019-01-28 10:04:23 +00:00 committed by Rafael J. Wysocki
parent a2ed1ee91f
commit 1c0d9b1c31
1 changed files with 10 additions and 13 deletions
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23
drivers/acpi/apei/bert.c
View File

@ -42,15 +42,7 @@ static void __init bert_print_all(struct acpi_bert_region *region,
int remain = region_len;
u32 estatus_len;
if (!estatus->block_status)
return;
while (remain > sizeof(struct acpi_bert_region)) {
if (cper_estatus_check(estatus)) {
pr_err(FW_BUG "Invalid error record.\n");
return;
}
while (remain >= sizeof(struct acpi_bert_region)) {
estatus_len = cper_estatus_len(estatus);
if (remain < estatus_len) {
pr_err(FW_BUG "Truncated status block (length: %u).\n",
@ -58,6 +50,15 @@ static void __init bert_print_all(struct acpi_bert_region *region,
return;
}
/* No more error records. */
if (!estatus->block_status)
return;
if (cper_estatus_check(estatus)) {
pr_err(FW_BUG "Invalid error record.\n");
return;
}
pr_info_once("Error records from previous boot:\n");
cper_estatus_print(KERN_INFO HW_ERR, estatus);
@ -70,10 +71,6 @@ static void __init bert_print_all(struct acpi_bert_region *region,
estatus->block_status = 0;
estatus = (void *)estatus + estatus_len;
/* No more error records. */
if (!estatus->block_status)
return;
remain -= estatus_len;
}
}