1 files changed, 65 insertions, 0 deletions

diff --git a/meta/recipes-bsp/grub/files/CVE-2020-27779_7.patch b/meta/recipes-bsp/grub/files/CVE-2020-27779_7.patch
new file mode 100644
index 0000000000..e5d372a2b1
--- /dev/null
+++ b/meta/recipes-bsp/grub/files/CVE-2020-27779_7.patch
@@ -0,0 +1,65 @@
+From dcc5a434e59f721b03cc809db0375a24aa2ac6d0 Mon Sep 17 00:00:00 2001
+From: Javier Martinez Canillas <javierm@redhat.com>
+Date: Sat, 7 Nov 2020 01:03:18 +0100
+Subject: [PATCH] docs: Document the cutmem command
+
+The command is not present in the docs/grub.texi user documentation.
+
+Reported-by: Daniel Kiper <daniel.kiper@oracle.com>
+Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
+Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
+Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
+
+Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=f05e79a0143beb2d9a482a3ebf4fe0ce76778122]
+CVE: CVE-2020-27779
+Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
+---
+ docs/grub.texi | 21 +++++++++++++++++++++
+ 1 file changed, 21 insertions(+)
+
+diff --git a/docs/grub.texi b/docs/grub.texi
+index ccf1908..ae85f55 100644
+--- a/docs/grub.texi
++++ b/docs/grub.texi
+@@ -3892,6 +3892,7 @@ you forget a command, you can run the command @command{help}
+ * cpuid::                       Check for CPU features
+ * crc::                         Compute or check CRC32 checksums
+ * cryptomount::                 Mount a crypto device
++* cutmem::                      Remove memory regions
+ * date::                        Display or set current date and time
+ * devicetree::                  Load a device tree blob
+ * distrust::                    Remove a pubkey from trusted keys
+@@ -4051,6 +4052,8 @@ this page is to be filtered.  This syntax makes it easy to represent patterns
+ that are often result of memory damage, due to physical distribution of memory
+ cells.
+ 
++The command is similar to @command{cutmem} command.
++
+ Note: The command is not allowed when lockdown is enforced (@pxref{Lockdown}).
+       This prevents removing EFI memory regions to potentially subvert the
+       security mechanisms provided by the UEFI secure boot.
+@@ -4214,6 +4217,24 @@ GRUB suports devices encrypted using LUKS and geli. Note that necessary modules
+ be used.
+ @end deffn
+ 
++@node cutmem
++@subsection cutmem
++
++@deffn Command cutmem from[K|M|G] to[K|M|G]
++Remove any memory regions in specified range.
++@end deffn
++
++This command notifies the memory manager that specified regions of RAM ought to
++be filtered out. This remains in effect after a payload kernel has been loaded
++by GRUB, as long as the loaded kernel obtains its memory map from GRUB. Kernels
++that support this include Linux, GNU Mach, the kernel of FreeBSD and Multiboot
++kernels in general.
++
++The command is similar to @command{badram} command.
++
++Note: The command is not allowed when lockdown is enforced (@pxref{Lockdown}).
++      This prevents removing EFI memory regions to potentially subvert the
++      security mechanisms provided by the UEFI secure boot.
+ 
+ @node date
+ @subsection date