[PATCH 5.6 014/126] iommu/amd: Fix over-read of ACPI UID from IVRS table

Greg Kroah-Hartman gregkh at linuxfoundation.org
Tue May 26 18:52:31 UTC 2020

From: Alexander Monakov <amonakov at ispras.ru>

[ Upstream commit e461b8c991b9202b007ea2059d953e264240b0c9 ]

IVRS parsing code always tries to read 255 bytes from memory when
retrieving ACPI device path, and makes an assumption that firmware
provides a zero-terminated string. Both of those are bugs: the entry
is likely to be shorter than 255 bytes, and zero-termination is not

With Acer SF314-42 firmware these issues manifest visibly in dmesg:

AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR0\xf0\xa5, rdevid:160
AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR1\xf0\xa5, rdevid:160
AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR2\xf0\xa5, rdevid:160
AMD-Vi: ivrs, add hid:AMDI0020, uid:\_SB.FUR3>\x83e\x8d\x9a\xd1...

The first three lines show how the code over-reads adjacent table
entries into the UID, and in the last line it even reads garbage data
beyond the end of the IVRS table itself.

Since each entry has the length of the UID (uidl member of ivhd_entry
struct), use that for memcpy, and manually add a zero terminator.

Avoid zero-filling hid and uid arrays up front, and instead ensure
the uid array is always zero-terminated. No change needed for the hid
array, as it was already properly zero-terminated.

Fixes: 2a0cb4e2d423c ("iommu/amd: Add new map for storing IVHD dev entry type HID")

Signed-off-by: Alexander Monakov <amonakov at ispras.ru>
Cc: Joerg Roedel <joro at 8bytes.org>
Cc: iommu at lists.linux-foundation.org
Link: https://lore.kernel.org/r/20200511102352.1831-1-amonakov@ispras.ru
Signed-off-by: Joerg Roedel <jroedel at suse.de>
Signed-off-by: Sasha Levin <sashal at kernel.org>
 drivers/iommu/amd_iommu_init.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 2b9a67ecc6ac..5b81fd16f5fa 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1329,8 +1329,8 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
 		case IVHD_DEV_ACPI_HID: {
 			u16 devid;
-			u8 hid[ACPIHID_HID_LEN] = {0};
-			u8 uid[ACPIHID_UID_LEN] = {0};
+			u8 hid[ACPIHID_HID_LEN];
+			u8 uid[ACPIHID_UID_LEN];
 			int ret;
 			if (h->type != 0x40) {
@@ -1347,6 +1347,7 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
+			uid[0] = '\0';
 			switch (e->uidf) {
@@ -1361,8 +1362,8 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
-				memcpy(uid, (u8 *)(&e->uid), ACPIHID_UID_LEN - 1);
-				uid[ACPIHID_UID_LEN - 1] = '\0';
+				memcpy(uid, &e->uid, e->uidl);
+				uid[e->uidl] = '\0';

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