grub: patch CVE-2025-0624

Cherry-pick patch mentioning this CVE.

(From OE-Core rev: 51d7f122bd8154fed3e261003d4accfbd085aad2)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 85 insertions, 0 deletions

diff --git a/meta/recipes-bsp/grub/files/CVE-2025-0624.patch b/meta/recipes-bsp/grub/files/CVE-2025-0624.patch
new file mode 100644
index 0000000000..229fe6399e
--- /dev/null
+++ b/meta/recipes-bsp/grub/files/CVE-2025-0624.patch
@@ -0,0 +1,84 @@
+From 5eef88152833062a3f7e017535372d64ac8ef7e1 Mon Sep 17 00:00:00 2001
+From: B Horn <b@horn.uk>
+Date: Fri, 15 Nov 2024 13:12:09 +0000
+Subject: [PATCH] net: Fix OOB write in grub_net_search_config_file()
+
+The function included a call to grub_strcpy() which copied data from an
+environment variable to a buffer allocated in grub_cmd_normal(). The
+grub_cmd_normal() didn't consider the length of the environment variable.
+So, the copy operation could exceed the allocation and lead to an OOB
+write. Fix the issue by replacing grub_strcpy() with grub_strlcpy() and
+pass the underlying buffers size to the grub_net_search_config_file().
+
+Fixes: CVE-2025-0624
+
+Reported-by: B Horn <b@horn.uk>
+Signed-off-by: B Horn <b@horn.uk>
+Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
+
+CVE: CVE-2025-0624
+Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=5eef88152833062a3f7e017535372d64ac8ef7e1]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ grub-core/net/net.c     | 7 ++++---
+ grub-core/normal/main.c | 2 +-
+ include/grub/net.h      | 2 +-
+ 3 files changed, 6 insertions(+), 5 deletions(-)
+
+diff --git a/grub-core/net/net.c b/grub-core/net/net.c
+index 0e41e21a5..9939ff601 100644
+--- a/grub-core/net/net.c
++++ b/grub-core/net/net.c
+@@ -1909,14 +1909,15 @@ grub_config_search_through (char *config, char *suffix,
+ }
+ 
+ grub_err_t
+-grub_net_search_config_file (char *config)
++grub_net_search_config_file (char *config, grub_size_t config_buf_len)
+ {
+-  grub_size_t config_len;
++  grub_size_t config_len, suffix_len;
+   char *suffix;
+ 
+   config_len = grub_strlen (config);
+   config[config_len] = '-';
+   suffix = config + config_len + 1;
++  suffix_len = config_buf_len - (config_len + 1);
+ 
+   struct grub_net_network_level_interface *inf;
+   FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
+@@ -1942,7 +1943,7 @@ grub_net_search_config_file (char *config)
+ 
+       if (client_uuid)
+         {
+-          grub_strcpy (suffix, client_uuid);
++          grub_strlcpy (suffix, client_uuid, suffix_len);
+           if (grub_config_search_through (config, suffix, 1, 0) == 0)
+             return GRUB_ERR_NONE;
+         }
+diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
+index 90879dc21..838f57fa5 100644
+--- a/grub-core/normal/main.c
++++ b/grub-core/normal/main.c
+@@ -344,7 +344,7 @@ grub_cmd_normal (struct grub_command *cmd __attribute__ ((unused)),
+ 
+           if (grub_strncmp (prefix + 1, "tftp", sizeof ("tftp") - 1) == 0 &&
+               !disable_net_search)
+-            grub_net_search_config_file (config);
++            grub_net_search_config_file (config, config_len);
+ 
+          grub_enter_normal_mode (config);
+          grub_free (config);
+diff --git a/include/grub/net.h b/include/grub/net.h
+index 228d04963..58a4f83fc 100644
+--- a/include/grub/net.h
++++ b/include/grub/net.h
+@@ -579,7 +579,7 @@ void
+ grub_net_remove_dns_server (const struct grub_net_network_level_address *s);
+ 
+ grub_err_t
+-grub_net_search_config_file (char *config);
++grub_net_search_config_file (char *config, grub_size_t config_buf_len);
+ 
+ extern char *grub_net_default_server;
+ 
diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc
index 8b638c58c0..d4f588660a 100644
--- a/meta/recipes-bsp/grub/grub2.inc
+++ b/meta/recipes-bsp/grub/grub2.inc
@@ -23,6 +23,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \
            file://CVE-2024-45782_CVE-2024-56737.patch \
            file://CVE-2024-45780.patch \
            file://CVE-2024-45783.patch \
+           file://CVE-2025-0624.patch \
 "
 
 SRC_URI[sha256sum] = "b30919fa5be280417c17ac561bb1650f60cfb80cc6237fa1e2b6f56154cb9c91"