forked from pool/grub2
e016790fe1
- Security fixes and hardenings for boothole 3 / boothole 2022 (bsc#1198581) * 0001-video-Remove-trailing-whitespaces.patch * 0002-loader-efi-chainloader-Simplify-the-loader-state.patch * 0003-commands-boot-Add-API-to-pass-context-to-loader.patch - Fix CVE-2022-28736 (bsc#1198496) * 0004-loader-efi-chainloader-Use-grub_loader_set_ex.patch - Fix CVE-2022-28735 (bsc#1198495) * 0005-kern-efi-sb-Reject-non-kernel-files-in-the-shim_lock.patch * 0006-kern-file-Do-not-leak-device_name-on-error-in-grub_f.patch * 0007-video-readers-png-Abort-sooner-if-a-read-operation-f.patch * 0008-video-readers-png-Refuse-to-handle-multiple-image-he.patch - Fix CVE-2021-3695 (bsc#1191184) * 0009-video-readers-png-Drop-greyscale-support-to-fix-heap.patch - Fix CVE-2021-3696 (bsc#1191185) * 0010-video-readers-png-Avoid-heap-OOB-R-W-inserting-huff-.patch * 0011-video-readers-png-Sanity-check-some-huffman-codes.patch * 0012-video-readers-jpeg-Abort-sooner-if-a-read-operation-.patch * 0013-video-readers-jpeg-Do-not-reallocate-a-given-huff-ta.patch * 0014-video-readers-jpeg-Refuse-to-handle-multiple-start-o.patch - Fix CVE-2021-3697 (bsc#1191186) * 0015-video-readers-jpeg-Block-int-underflow-wild-pointer-.patch * 0016-normal-charset-Fix-array-out-of-bounds-formatting-un.patch - Fix CVE-2022-28733 (bsc#1198460) * 0017-net-ip-Do-IP-fragment-maths-safely.patch * 0018-net-netbuff-Block-overly-large-netbuff-allocs.patch * 0019-net-dns-Fix-double-free-addresses-on-corrupt-DNS-res.patch * 0020-net-dns-Don-t-read-past-the-end-of-the-string-we-re-.patch * 0021-net-tftp-Prevent-a-UAF-and-double-free-from-a-failed.patch * 0022-net-tftp-Avoid-a-trivial-UAF.patch * 0023-net-http-Do-not-tear-down-socket-if-it-s-already-bee.patch OBS-URL: https://build.opensuse.org/request/show/981228 OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=416
80 lines
2.5 KiB
Diff
80 lines
2.5 KiB
Diff
From c64e0158654a1098caf652f6ffd192cbe26583f3 Mon Sep 17 00:00:00 2001
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From: Darren Kenny <darren.kenny@oracle.com>
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Date: Tue, 29 Mar 2022 10:49:56 +0000
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Subject: [PATCH 29/32] fs/btrfs: Fix several fuzz issues with invalid dir item
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sizing
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According to the btrfs code in Linux, the structure of a directory item
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leaf should be of the form:
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|struct btrfs_dir_item|name|data|
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in GRUB the name len and data len are in the grub_btrfs_dir_item
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structure's n and m fields respectively.
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The combined size of the structure, name and data should be less than
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the allocated memory, a difference to the Linux kernel's struct
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btrfs_dir_item is that the grub_btrfs_dir_item has an extra field for
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where the name is stored, so we adjust for that too.
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Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/fs/btrfs.c | 26 ++++++++++++++++++++++++++
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1 file changed, 26 insertions(+)
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diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
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index 42fdbaf616..626fd2daa0 100644
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--- a/grub-core/fs/btrfs.c
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+++ b/grub-core/fs/btrfs.c
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@@ -2210,6 +2210,7 @@ grub_btrfs_dir (grub_device_t device, const char *path,
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grub_uint64_t tree;
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grub_uint8_t type;
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char *new_path = NULL;
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+ grub_size_t est_size = 0;
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if (!data)
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return grub_errno;
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@@ -2276,6 +2277,18 @@ grub_btrfs_dir (grub_device_t device, const char *path,
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break;
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}
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+ if (direl == NULL ||
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+ grub_add (grub_le_to_cpu16 (direl->n),
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+ grub_le_to_cpu16 (direl->m), &est_size) ||
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+ grub_add (est_size, sizeof (*direl), &est_size) ||
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+ grub_sub (est_size, sizeof (direl->name), &est_size) ||
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+ est_size > allocated)
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+ {
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+ grub_errno = GRUB_ERR_OUT_OF_RANGE;
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+ r = -grub_errno;
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+ goto out;
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+ }
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+
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for (cdirel = direl;
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(grub_uint8_t *) cdirel - (grub_uint8_t *) direl
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< (grub_ssize_t) elemsize;
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@@ -2286,6 +2299,19 @@ grub_btrfs_dir (grub_device_t device, const char *path,
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char c;
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struct grub_btrfs_inode inode;
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struct grub_dirhook_info info;
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+
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+ if (cdirel == NULL ||
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+ grub_add (grub_le_to_cpu16 (cdirel->n),
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+ grub_le_to_cpu16 (cdirel->m), &est_size) ||
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+ grub_add (est_size, sizeof (*cdirel), &est_size) ||
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+ grub_sub (est_size, sizeof (cdirel->name), &est_size) ||
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+ est_size > allocated)
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+ {
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+ grub_errno = GRUB_ERR_OUT_OF_RANGE;
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+ r = -grub_errno;
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+ goto out;
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+ }
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+
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err = grub_btrfs_read_inode (data, &inode, cdirel->key.object_id,
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tree);
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grub_memset (&info, 0, sizeof (info));
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--
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2.34.1
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