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Message-ID: <2024072942-CVE-2024-42084-9283@gregkh> Date: Mon, 29 Jul 2024 18:26:43 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-42084: ftruncate: pass a signed offset Description =========== In the Linux kernel, the following vulnerability has been resolved: ftruncate: pass a signed offset The old ftruncate() syscall, using the 32-bit off_t misses a sign extension when called in compat mode on 64-bit architectures. As a result, passing a negative length accidentally succeeds in truncating to file size between 2GiB and 4GiB. Changing the type of the compat syscall to the signed compat_off_t changes the behavior so it instead returns -EINVAL. The native entry point, the truncate() syscall and the corresponding loff_t based variants are all correct already and do not suffer from this mistake. The Linux kernel CVE team has assigned CVE-2024-42084 to this issue. Affected and fixed versions =========================== Issue introduced in 3.9 with commit 3f6d078d4acc and fixed in 4.19.317 with commit c329760749b5 Issue introduced in 3.9 with commit 3f6d078d4acc and fixed in 5.4.279 with commit f531d4bc6c55 Issue introduced in 3.9 with commit 3f6d078d4acc and fixed in 5.10.221 with commit 84bf6b64a1a0 Issue introduced in 3.9 with commit 3f6d078d4acc and fixed in 5.15.162 with commit dbb226d81cd0 Issue introduced in 3.9 with commit 3f6d078d4acc and fixed in 6.1.97 with commit 5ae6af68410b Issue introduced in 3.9 with commit 3f6d078d4acc and fixed in 6.6.37 with commit 836359247b04 Issue introduced in 3.9 with commit 3f6d078d4acc and fixed in 6.9.8 with commit 930a4c369f74 Issue introduced in 3.9 with commit 3f6d078d4acc and fixed in 6.10 with commit 4b8e88e563b5 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-2024-42084 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: fs/open.c include/linux/compat.h include/linux/syscalls.h 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/c329760749b5419769e57cb2be80955d2805f9c9 https://git.kernel.org/stable/c/f531d4bc6c5588d713359e42ed65e46816d841d8 https://git.kernel.org/stable/c/84bf6b64a1a0dfc6de7e1b1c776d58d608e7865a https://git.kernel.org/stable/c/dbb226d81cd02cee140139c2369791e6f61f2007 https://git.kernel.org/stable/c/5ae6af68410bdad6181ec82104bb9985a7a6a0fa https://git.kernel.org/stable/c/836359247b0403e0634bfbc83e5bb8063fad287a https://git.kernel.org/stable/c/930a4c369f74da26816eaaa71b5888d29b759c27 https://git.kernel.org/stable/c/4b8e88e563b5f666446d002ad0dc1e6e8e7102b0
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