linux-cve-announce - CVE-2024-43816: scsi: lpfc: Revise lpfc_prep_embed_io routine with proper endian macro usages

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Message-ID: <2024081723-CVE-2024-43816-293f@gregkh>
Date: Sat, 17 Aug 2024 11:22:20 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-43816: scsi: lpfc: Revise lpfc_prep_embed_io routine with proper endian macro usages

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

scsi: lpfc: Revise lpfc_prep_embed_io routine with proper endian macro usages

On big endian architectures, it is possible to run into a memory out of
bounds pointer dereference when FCP targets are zoned.

In lpfc_prep_embed_io, the memcpy(ptr, fcp_cmnd, sgl->sge_len) is
referencing a little endian formatted sgl->sge_len value.  So, the memcpy
can cause big endian systems to crash.

Redefine the *sgl ptr as a struct sli4_sge_le to make it clear that we are
referring to a little endian formatted data structure.  And, update the
routine with proper le32_to_cpu macro usages.

The Linux kernel CVE team has assigned CVE-2024-43816 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 6.10 with commit af20bb73ac25 and fixed in 6.10.3 with commit 9fd003f344d5
	Issue introduced in 6.10 with commit af20bb73ac25 and fixed in 6.11-rc1 with commit 8bc7c617642d

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2024-43816
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	drivers/scsi/lpfc/lpfc_sli.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/9fd003f344d502f65252963169df3dd237054e49
	https://git.kernel.org/stable/c/8bc7c617642db6d8d20ee671fb6c4513017e7a7e