From: Marta Rybczynska <rybczyn...@gmail.com> This patch adds a fix for an incorrect use of a negative value in grub's util/glue-efi. It is a part of a security series [1].
[1] https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00007.html Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> Signed-off-by: Steve Sakoman <st...@sakoman.com> --- ...x-incorrect-use-of-a-possibly-negati.patch | 50 +++++++++++++++++++ meta/recipes-bsp/grub/grub2.inc | 1 + 2 files changed, 51 insertions(+) create mode 100644 meta/recipes-bsp/grub/files/0043-util-glue-efi-Fix-incorrect-use-of-a-possibly-negati.patch diff --git a/meta/recipes-bsp/grub/files/0043-util-glue-efi-Fix-incorrect-use-of-a-possibly-negati.patch b/meta/recipes-bsp/grub/files/0043-util-glue-efi-Fix-incorrect-use-of-a-possibly-negati.patch new file mode 100644 index 0000000000..66d7c0aa42 --- /dev/null +++ b/meta/recipes-bsp/grub/files/0043-util-glue-efi-Fix-incorrect-use-of-a-possibly-negati.patch @@ -0,0 +1,50 @@ +From e301a0f38a2130eb80f346c31e43bf5089af583c Mon Sep 17 00:00:00 2001 +From: Darren Kenny <darren.ke...@oracle.com> +Date: Fri, 4 Dec 2020 15:04:28 +0000 +Subject: [PATCH] util/glue-efi: Fix incorrect use of a possibly negative value + +It is possible for the ftell() function to return a negative value, +although it is fairly unlikely here, we should be checking for +a negative value before we assign it to an unsigned value. + +Fixes: CID 73744 + +Signed-off-by: Darren Kenny <darren.ke...@oracle.com> +Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com> + +Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=1641d74e16f9d1ca35ba1a87ee4a0bf3afa48e72] +Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> +--- + util/glue-efi.c | 14 ++++++++++++-- + 1 file changed, 12 insertions(+), 2 deletions(-) + +diff --git a/util/glue-efi.c b/util/glue-efi.c +index 68f5316..de0fa6d 100644 +--- a/util/glue-efi.c ++++ b/util/glue-efi.c +@@ -39,13 +39,23 @@ write_fat (FILE *in32, FILE *in64, FILE *out, const char *out_filename, + struct grub_macho_fat_header head; + struct grub_macho_fat_arch arch32, arch64; + grub_uint32_t size32, size64; ++ long size; + char *buf; + + fseek (in32, 0, SEEK_END); +- size32 = ftell (in32); ++ size = ftell (in32); ++ if (size < 0) ++ grub_util_error ("cannot get end of input file '%s': %s", ++ name32, strerror (errno)); ++ size32 = (grub_uint32_t) size; + fseek (in32, 0, SEEK_SET); ++ + fseek (in64, 0, SEEK_END); +- size64 = ftell (in64); ++ size = ftell (in64); ++ if (size < 0) ++ grub_util_error ("cannot get end of input file '%s': %s", ++ name64, strerror (errno)); ++ size64 = (grub_uint64_t) size; + fseek (in64, 0, SEEK_SET); + + head.magic = grub_cpu_to_le32_compile_time (GRUB_MACHO_FAT_EFI_MAGIC); diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc index a1fbc5e644..2f230065b2 100644 --- a/meta/recipes-bsp/grub/grub2.inc +++ b/meta/recipes-bsp/grub/grub2.inc @@ -89,6 +89,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \ file://0040-loader-xnu-Check-if-pointer-is-NULL-before-using-it.patch \ file://0041-util-grub-install-Fix-NULL-pointer-dereferences.patch \ file://0042-util-grub-editenv-Fix-incorrect-casting-of-a-signed-.patch \ + file://0043-util-glue-efi-Fix-incorrect-use-of-a-possibly-negati.patch \ " SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934" SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea" -- 2.25.1
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