diff options
Diffstat (limited to 'meta/recipes-bsp/grub/files/CVE-2023-4692.patch')
| -rw-r--r-- | meta/recipes-bsp/grub/files/CVE-2023-4692.patch | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/meta/recipes-bsp/grub/files/CVE-2023-4692.patch b/meta/recipes-bsp/grub/files/CVE-2023-4692.patch deleted file mode 100644 index 305fcc93d89..00000000000 --- a/meta/recipes-bsp/grub/files/CVE-2023-4692.patch +++ /dev/null @@ -1,98 +0,0 @@ -From 43651027d24e62a7a463254165e1e46e42aecdea Mon Sep 17 00:00:00 2001 -From: Maxim Suhanov <dfirblog@gmail.com> -Date: Mon, 28 Aug 2023 16:31:57 +0300 -Subject: [PATCH] fs/ntfs: Fix an OOB write when parsing the $ATTRIBUTE_LIST attribute - for the $MFT file - -When parsing an extremely fragmented $MFT file, i.e., the file described -using the $ATTRIBUTE_LIST attribute, current NTFS code will reuse a buffer -containing bytes read from the underlying drive to store sector numbers, -which are consumed later to read data from these sectors into another buffer. - -These sectors numbers, two 32-bit integers, are always stored at predefined -offsets, 0x10 and 0x14, relative to first byte of the selected entry within -the $ATTRIBUTE_LIST attribute. Usually, this won't cause any problem. - -However, when parsing a specially-crafted file system image, this may cause -the NTFS code to write these integers beyond the buffer boundary, likely -causing the GRUB memory allocator to misbehave or fail. These integers contain -values which are controlled by on-disk structures of the NTFS file system. - -Such modification and resulting misbehavior may touch a memory range not -assigned to the GRUB and owned by firmware or another EFI application/driver. - -This fix introduces checks to ensure that these sector numbers are never -written beyond the boundary. - -Fixes: CVE-2023-4692 - -Upstream-Status: Backport from -[https://git.savannah.gnu.org/cgit/grub.git/commit/?id=43651027d24e62a7a463254165e1e46e42aecdea] -CVE: CVE-2023-4692 - -Reported-by: Maxim Suhanov <dfirblog@gmail.com> -Signed-off-by: Maxim Suhanov <dfirblog@gmail.com> -Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> -Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com> ---- - grub-core/fs/ntfs.c | 18 +++++++++++++++++- - 1 file changed, 17 insertions(+), 1 deletion(-) - -diff --git a/grub-core/fs/ntfs.c b/grub-core/fs/ntfs.c -index bbdbe24..c3c4db1 100644 ---- a/grub-core/fs/ntfs.c -+++ b/grub-core/fs/ntfs.c -@@ -184,7 +184,7 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr) - } - if (at->attr_end) - { -- grub_uint8_t *pa; -+ grub_uint8_t *pa, *pa_end; - - at->emft_buf = grub_malloc (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR); - if (at->emft_buf == NULL) -@@ -209,11 +209,13 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr) - } - at->attr_nxt = at->edat_buf; - at->attr_end = at->edat_buf + u32at (pa, 0x30); -+ pa_end = at->edat_buf + n; - } - else - { - at->attr_nxt = at->attr_end + u16at (pa, 0x14); - at->attr_end = at->attr_end + u32at (pa, 4); -+ pa_end = at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR); - } - at->flags |= GRUB_NTFS_AF_ALST; - while (at->attr_nxt < at->attr_end) -@@ -230,6 +232,13 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr) - at->flags |= GRUB_NTFS_AF_GPOS; - at->attr_cur = at->attr_nxt; - pa = at->attr_cur; -+ -+ if ((pa >= pa_end) || (pa_end - pa < 0x18)) -+ { -+ grub_error (GRUB_ERR_BAD_FS, "can\'t parse attribute list"); -+ return NULL; -+ } -+ - grub_set_unaligned32 ((char *) pa + 0x10, - grub_cpu_to_le32 (at->mft->data->mft_start)); - grub_set_unaligned32 ((char *) pa + 0x14, -@@ -240,6 +249,13 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr) - { - if (*pa != attr) - break; -+ -+ if ((pa >= pa_end) || (pa_end - pa < 0x18)) -+ { -+ grub_error (GRUB_ERR_BAD_FS, "can\'t parse attribute list"); -+ return NULL; -+ } -+ - if (read_attr - (at, pa + 0x10, - u32at (pa, 0x10) * (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR), --- -cgit v1.1 - |