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
56 lines
1.7 KiB
Diff
56 lines
1.7 KiB
Diff
From bf949ed28a526b7ab137b8804e2ef6239c3061f2 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Tue, 8 Mar 2022 23:47:46 +1100
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Subject: [PATCH 18/32] net/netbuff: Block overly large netbuff allocs
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A netbuff shouldn't be too huge. It's bounded by MTU and TCP segment
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reassembly. If we are asked to create one that is unreasonably big, refuse.
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This is a hardening measure: if we hit this code, there's a bug somewhere
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else that we should catch and fix.
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This commit:
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- stops the bug propagating any further.
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- provides a spot to instrument in e.g. fuzzing to try to catch these bugs.
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I have put instrumentation (e.g. __builtin_trap() to force a crash) here and
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have not been able to find any more crashes.
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/net/netbuff.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/grub-core/net/netbuff.c b/grub-core/net/netbuff.c
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index dbeeefe478..d5e9e9a0d7 100644
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--- a/grub-core/net/netbuff.c
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+++ b/grub-core/net/netbuff.c
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@@ -79,10 +79,23 @@ grub_netbuff_alloc (grub_size_t len)
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COMPILE_TIME_ASSERT (NETBUFF_ALIGN % sizeof (grub_properly_aligned_t) == 0);
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+ /*
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+ * The largest size of a TCP packet is 64 KiB, and everything else
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+ * should be a lot smaller - most MTUs are 1500 or less. Cap data
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+ * size at 64 KiB + a buffer.
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+ */
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+ if (len > 0xffffUL + 0x1000UL)
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+ {
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+ grub_error (GRUB_ERR_BUG,
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+ "attempted to allocate a packet that is too big");
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+ return NULL;
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+ }
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+
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if (len < NETBUFFMINLEN)
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len = NETBUFFMINLEN;
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len = ALIGN_UP (len, NETBUFF_ALIGN);
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+
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#ifdef GRUB_MACHINE_EMU
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data = grub_malloc (len + sizeof (*nb));
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#else
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--
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2.34.1
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