From: Marta Rybczynska <rybczyn...@gmail.com> This patch adds a fix for a possible integer overflows in grub's zfs. 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> --- ...3-zfs-Fix-possible-integer-overflows.patch | 56 +++++++++++++++++++ meta/recipes-bsp/grub/grub2.inc | 1 + 2 files changed, 57 insertions(+) create mode 100644 meta/recipes-bsp/grub/files/0023-zfs-Fix-possible-integer-overflows.patch diff --git a/meta/recipes-bsp/grub/files/0023-zfs-Fix-possible-integer-overflows.patch b/meta/recipes-bsp/grub/files/0023-zfs-Fix-possible-integer-overflows.patch new file mode 100644 index 0000000000..8df758b41f --- /dev/null +++ b/meta/recipes-bsp/grub/files/0023-zfs-Fix-possible-integer-overflows.patch @@ -0,0 +1,56 @@ +From ec35d862f3567671048aa0d0d8ad1ded1fd25336 Mon Sep 17 00:00:00 2001 +From: Darren Kenny <darren.ke...@oracle.com> +Date: Tue, 8 Dec 2020 22:17:04 +0000 +Subject: [PATCH] zfs: Fix possible integer overflows + +In all cases the problem is that the value being acted upon by +a left-shift is a 32-bit number which is then being used in the +context of a 64-bit number. + +To avoid overflow we ensure that the number being shifted is 64-bit +before the shift is done. + +Fixes: CID 73684, CID 73695, CID 73764 + +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=302c12ff5714bc455949117c1c9548ccb324d55b] +Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> +--- + grub-core/fs/zfs/zfs.c | 8 ++++---- + 1 file changed, 4 insertions(+), 4 deletions(-) + +diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c +index 9087a72..b078ccc 100644 +--- a/grub-core/fs/zfs/zfs.c ++++ b/grub-core/fs/zfs/zfs.c +@@ -564,7 +564,7 @@ find_bestub (uberblock_phys_t * ub_array, + ubptr = (uberblock_phys_t *) ((grub_properly_aligned_t *) ub_array + + ((i << ub_shift) + / sizeof (grub_properly_aligned_t))); +- err = uberblock_verify (ubptr, offset, 1 << ub_shift); ++ err = uberblock_verify (ubptr, offset, (grub_size_t) 1 << ub_shift); + if (err) + { + grub_errno = GRUB_ERR_NONE; +@@ -1543,7 +1543,7 @@ read_device (grub_uint64_t offset, struct grub_zfs_device_desc *desc, + + high = grub_divmod64 ((offset >> desc->ashift) + c, + desc->n_children, &devn); +- csize = bsize << desc->ashift; ++ csize = (grub_size_t) bsize << desc->ashift; + if (csize > len) + csize = len; + +@@ -1635,8 +1635,8 @@ read_device (grub_uint64_t offset, struct grub_zfs_device_desc *desc, + + while (len > 0) + { +- grub_size_t csize; +- csize = ((s / (desc->n_children - desc->nparity)) ++ grub_size_t csize = s; ++ csize = ((csize / (desc->n_children - desc->nparity)) + << desc->ashift); + if (csize > len) + csize = len; diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc index 1630235edd..9158fc7f50 100644 --- a/meta/recipes-bsp/grub/grub2.inc +++ b/meta/recipes-bsp/grub/grub2.inc @@ -69,6 +69,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \ file://0020-hfsplus-Check-that-the-volume-name-length-is-valid.patch \ file://0021-zfs-Fix-possible-negative-shift-operation.patch \ file://0022-zfs-Fix-resource-leaks-while-constructing-path.patch \ + file://0023-zfs-Fix-possible-integer-overflows.patch \ " SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934" SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea" -- 2.25.1
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