From 9426c3c83d2a06ae3941d833b76d58ad04e2a294 Mon Sep 17 00:00:00 2001 From: Marta Rybczynska Date: Fri, 18 Feb 2022 11:05:54 +0100 Subject: grub: add a fix for a crash in scripts This patch adds a fix for a crash in grub's script handling. It is a part of a security series [1]. [1] https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00007.html (From OE-Core rev: 79ce9059f716546a7d6f4562ba194aedd90c22cd) Signed-off-by: Marta Rybczynska Signed-off-by: Steve Sakoman Signed-off-by: Richard Purdie --- ...ute-Avoid-crash-when-using-outside-a-func.patch | 37 ++++++++++++++++++++++ meta/recipes-bsp/grub/grub2.inc | 1 + 2 files changed, 38 insertions(+) create mode 100644 meta/recipes-bsp/grub/files/0046-script-execute-Avoid-crash-when-using-outside-a-func.patch (limited to 'meta/recipes-bsp') diff --git a/meta/recipes-bsp/grub/files/0046-script-execute-Avoid-crash-when-using-outside-a-func.patch b/meta/recipes-bsp/grub/files/0046-script-execute-Avoid-crash-when-using-outside-a-func.patch new file mode 100644 index 0000000000..84117a9073 --- /dev/null +++ b/meta/recipes-bsp/grub/files/0046-script-execute-Avoid-crash-when-using-outside-a-func.patch @@ -0,0 +1,37 @@ +From df2505c4c3cf42b0c419c99a5f9e1ce63e5a5938 Mon Sep 17 00:00:00 2001 +From: Daniel Axtens +Date: Mon, 11 Jan 2021 17:30:42 +1100 +Subject: [PATCH] script/execute: Avoid crash when using "$#" outside a + function scope + +"$#" represents the number of arguments to a function. It is only +defined in a function scope, where "scope" is non-NULL. Currently, +if we attempt to evaluate "$#" outside a function scope, "scope" will +be NULL and we will crash with a NULL pointer dereference. + +Do not attempt to count arguments for "$#" if "scope" is NULL. This +will result in "$#" being interpreted as an empty string if evaluated +outside a function scope. + +Signed-off-by: Daniel Axtens +Reviewed-by: Daniel Kiper + +Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=fe0586347ee46f927ae27bb9673532da9f5dead5] +Signed-off-by: Marta Rybczynska +--- + grub-core/script/execute.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c +index 5ea2aef..23d34bd 100644 +--- a/grub-core/script/execute.c ++++ b/grub-core/script/execute.c +@@ -485,7 +485,7 @@ gettext_putvar (const char *str, grub_size_t len, + return 0; + + /* Enough for any number. */ +- if (len == 1 && str[0] == '#') ++ if (len == 1 && str[0] == '#' && scope != NULL) + { + grub_snprintf (*ptr, 30, "%u", scope->argv.argc); + *ptr += grub_strlen (*ptr); diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc index 0454b09d52..75ef31f249 100644 --- a/meta/recipes-bsp/grub/grub2.inc +++ b/meta/recipes-bsp/grub/grub2.inc @@ -92,6 +92,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \ file://0043-util-glue-efi-Fix-incorrect-use-of-a-possibly-negati.patch \ file://0044-script-execute-Fix-NULL-dereference-in-grub_script_e.patch \ file://0045-commands-ls-Require-device_name-is-not-NULL-before-p.patch \ + file://0046-script-execute-Avoid-crash-when-using-outside-a-func.patch \ " SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934" SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea" -- cgit v1.2.3-54-g00ecf