From: Hans de Goede hdegoede@redhat.com
commit 96788c7a7f1e7206519d4d736f89a2072dcfe0fc upstream.
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.
Fixes: f5a68bb0752e ("iommu/vt-d: Mark firmware tainted if RMRR fails sanity check") Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Joerg Roedel jroedel@suse.de Acked-by: Lu Baolu baolu.lu@linux.intel.com Cc: stable@vger.kernel.org Cc: Barret Rhoden brho@google.com Link: https://lore.kernel.org/r/20200309140138.3753-3-hdegoede@redhat.com BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1808874 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/iommu/intel-iommu.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -4330,14 +4330,16 @@ int __init dmar_parse_one_rmrr(struct ac struct dmar_rmrr_unit *rmrru;
rmrr = (struct acpi_dmar_reserved_memory *)header; - if (arch_rmrr_sanity_check(rmrr)) - WARN_TAINT(1, TAINT_FIRMWARE_WORKAROUND, + if (arch_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)