1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
From 2f2265a8cbc6b43deb169c525204ea7df02e9363 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 9 Mar 2020 13:55:02 +0100
Subject: [PATCH 1/2] iommu/vt-d: dmar: replace WARN_TAINT with pr_warn +
add_taint
Quoting from the comment describing the WARN functions in
include/asm-generic/bug.h:
* WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
* significant kernel issues that need prompt attention if they should ever
* appear at runtime.
*
* Do not use these macros when checking for invalid external inputs
The (buggy) firmware tables which the dmar code was calling WARN_TAINT
for really are invalid external inputs. They are not under the kernel's
control and the issues in them cannot be fixed by a kernel update.
So logging a backtrace, which invites bug reports to be filed about this,
is not helpful.
Some distros, e.g. Fedora, have tools watching for the kernel backtraces
logged by the WARN macros and offer the user an option to file a bug for
this when these are encountered. The WARN_TAINT in warn_invalid_dmar()
+ another iommu WARN_TAINT, addressed in another patch, have lead to over
a 100 bugs being filed this way.
This commit replaces the WARN_TAINT("...") calls, with
pr_warn(FW_BUG "...") + add_taint(TAINT_FIRMWARE_WORKAROUND, ...) calls
avoiding the backtrace and thus also avoiding bug-reports being filed
about this against the kernel.
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1564895
Fixes: e625b4a95d50 ("iommu/vt-d: Parse ANDD records")
Fixes: fd0c8894893c ("intel-iommu: Set a more specific taint flag for invalid BI
Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/iommu/dmar.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 071bb42bbbc5..87194a46cb0b 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -440,12 +440,13 @@ static int __init dmar_parse_one_andd(struct acpi_dmar_header *header,
/* Check for NUL termination within the designated length */
if (strnlen(andd->device_name, header->length - 8) == header->length - 8) {
- WARN_TAINT(1, TAINT_FIRMWARE_WORKAROUND,
+ pr_warn(FW_BUG
"Your BIOS is broken; ANDD object name is not NUL-terminated\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
dmi_get_system_info(DMI_BIOS_VENDOR),
dmi_get_system_info(DMI_BIOS_VERSION),
dmi_get_system_info(DMI_PRODUCT_VERSION));
+ add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
return -EINVAL;
}
pr_info("ANDD device: %x name: %s\n", andd->device_number,
@@ -471,14 +472,14 @@ static int dmar_parse_one_rhsa(struct acpi_dmar_header *header, void *arg)
return 0;
}
}
- WARN_TAINT(
- 1, TAINT_FIRMWARE_WORKAROUND,
+ pr_warn(FW_BUG
"Your BIOS is broken; RHSA refers to non-existent DMAR unit at %llx\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
drhd->reg_base_addr,
dmi_get_system_info(DMI_BIOS_VENDOR),
dmi_get_system_info(DMI_BIOS_VERSION),
dmi_get_system_info(DMI_PRODUCT_VERSION));
+ add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
return 0;
}
@@ -827,14 +828,14 @@ int __init dmar_table_init(void)
static void warn_invalid_dmar(u64 addr, const char *message)
{
- WARN_TAINT_ONCE(
- 1, TAINT_FIRMWARE_WORKAROUND,
+ pr_warn_once(FW_BUG
"Your BIOS is broken; DMAR reported at address %llx%s!\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
addr, message,
dmi_get_system_info(DMI_BIOS_VENDOR),
dmi_get_system_info(DMI_BIOS_VERSION),
dmi_get_system_info(DMI_PRODUCT_VERSION));
+ add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
}
static int __ref
--
2.25.1
From 038ebd8952c5fb3ba3b5e09b0b55a4e617ae22bf Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 9 Mar 2020 14:12:37 +0100
Subject: [PATCH 2/2] iommu/vt-d: dmar_parse_one_rmrr: replace WARN_TAINT with
pr_warn + add_taint
Quoting from the comment describing the WARN functions in
include/asm-generic/bug.h:
* WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
* significant kernel issues that need prompt attention if they should ever
* appear at runtime.
*
* Do not use these macros when checking for invalid external inputs
The (buggy) firmware tables which the dmar code was calling WARN_TAINT
for really are invalid external inputs. They are not under the kernel's
control and the issues in them cannot be fixed by a kernel update.
So logging a backtrace, which invites bug reports to be filed about this,
is not helpful.
Some distros, e.g. Fedora, have tools watching for the kernel backtraces
logged by the WARN macros and offer the user an option to file a bug for
this when these are encountered. The WARN_TAINT in dmar_parse_one_rmrr
+ another iommu WARN_TAINT, addressed in another patch, have lead to over
a 100 bugs being filed this way.
This commit replaces the WARN_TAINT("...") call, with a
pr_warn(FW_BUG "...") + add_taint(TAINT_FIRMWARE_WORKAROUND, ...) call
avoiding the backtrace and thus also avoiding bug-reports being filed
about this against the kernel.
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1808874
Fixes: f5a68bb0752e ("iommu/vt-d: Mark firmware tainted if RMRR fails sanity check")
Cc: Barret Rhoden <brho@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/iommu/intel-iommu.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6fa6de2b6ad5..3857a5cd1a75 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4460,14 +4460,16 @@ int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg)
struct dmar_rmrr_unit *rmrru;
rmrr = (struct acpi_dmar_reserved_memory *)header;
- if (rmrr_sanity_check(rmrr))
- WARN_TAINT(1, TAINT_FIRMWARE_WORKAROUND,
+ if (rmrr_sanity_check(rmrr)) {
+ pr_warn(FW_BUG
"Your BIOS is broken; bad RMRR [%#018Lx-%#018Lx]\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
rmrr->base_address, rmrr->end_address,
dmi_get_system_info(DMI_BIOS_VENDOR),
dmi_get_system_info(DMI_BIOS_VERSION),
dmi_get_system_info(DMI_PRODUCT_VERSION));
+ add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
+ }
rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL);
if (!rmrru)
--
2.25.1
|
