From: Marta Rybczynska <rybczyn...@gmail.com> This patch fixes a possible unintended sign extension in grub's libgcrypt/mpi. 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-possible-unintended-sign-extension.patch | 36 +++++++++++++++++++ meta/recipes-bsp/grub/grub2.inc | 1 + 2 files changed, 37 insertions(+) create mode 100644 meta/recipes-bsp/grub/files/0026-libgcrypt-mpi-Fix-possible-unintended-sign-extension.patch diff --git a/meta/recipes-bsp/grub/files/0026-libgcrypt-mpi-Fix-possible-unintended-sign-extension.patch b/meta/recipes-bsp/grub/files/0026-libgcrypt-mpi-Fix-possible-unintended-sign-extension.patch new file mode 100644 index 0000000000..f500f1a296 --- /dev/null +++ b/meta/recipes-bsp/grub/files/0026-libgcrypt-mpi-Fix-possible-unintended-sign-extension.patch @@ -0,0 +1,36 @@ +From 9b16d7bcad1c7fea7f26eb2fb3af1a5ca70ba34e Mon Sep 17 00:00:00 2001 +From: Darren Kenny <darren.ke...@oracle.com> +Date: Tue, 3 Nov 2020 16:43:37 +0000 +Subject: [PATCH] libgcrypt/mpi: Fix possible unintended sign extension + +The array of unsigned char gets promoted to a signed 32-bit int before +it is finally promoted to a size_t. There is the possibility that this +may result in the signed-bit being set for the intermediate signed +32-bit int. We should ensure that the promotion is to the correct type +before we bitwise-OR the values. + +Fixes: CID 96697 + +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=e8814c811132a70f9b55418f7567378a34ad3883] +Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> + +--- + grub-core/lib/libgcrypt/mpi/mpicoder.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/grub-core/lib/libgcrypt/mpi/mpicoder.c b/grub-core/lib/libgcrypt/mpi/mpicoder.c +index a3435ed..7ecad27 100644 +--- a/grub-core/lib/libgcrypt/mpi/mpicoder.c ++++ b/grub-core/lib/libgcrypt/mpi/mpicoder.c +@@ -458,7 +458,7 @@ gcry_mpi_scan (struct gcry_mpi **ret_mpi, enum gcry_mpi_format format, + if (len && len < 4) + return gcry_error (GPG_ERR_TOO_SHORT); + +- n = (s[0] << 24 | s[1] << 16 | s[2] << 8 | s[3]); ++ n = ((size_t)s[0] << 24 | (size_t)s[1] << 16 | (size_t)s[2] << 8 | (size_t)s[3]); + s += 4; + if (len) + len -= 4; diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc index 13e2b1600d..be35ac04ef 100644 --- a/meta/recipes-bsp/grub/grub2.inc +++ b/meta/recipes-bsp/grub/grub2.inc @@ -72,6 +72,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \ file://0023-zfs-Fix-possible-integer-overflows.patch \ file://0024-zfsinfo-Correct-a-check-for-error-allocating-memory.patch \ file://0025-affs-Fix-memory-leaks.patch \ + file://0026-libgcrypt-mpi-Fix-possible-unintended-sign-extension.patch \ " SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934" SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea" -- 2.25.1
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