| From bippy-1.1.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2023-53035: nilfs2: fix kernel-infoleak in nilfs_ioctl_wrap_copy() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| nilfs2: fix kernel-infoleak in nilfs_ioctl_wrap_copy() |
| |
| The ioctl helper function nilfs_ioctl_wrap_copy(), which exchanges a |
| metadata array to/from user space, may copy uninitialized buffer regions |
| to user space memory for read-only ioctl commands NILFS_IOCTL_GET_SUINFO |
| and NILFS_IOCTL_GET_CPINFO. |
| |
| This can occur when the element size of the user space metadata given by |
| the v_size member of the argument nilfs_argv structure is larger than the |
| size of the metadata element (nilfs_suinfo structure or nilfs_cpinfo |
| structure) on the file system side. |
| |
| KMSAN-enabled kernels detect this issue as follows: |
| |
| BUG: KMSAN: kernel-infoleak in instrument_copy_to_user |
| include/linux/instrumented.h:121 [inline] |
| BUG: KMSAN: kernel-infoleak in _copy_to_user+0xc0/0x100 lib/usercopy.c:33 |
| instrument_copy_to_user include/linux/instrumented.h:121 [inline] |
| _copy_to_user+0xc0/0x100 lib/usercopy.c:33 |
| copy_to_user include/linux/uaccess.h:169 [inline] |
| nilfs_ioctl_wrap_copy+0x6fa/0xc10 fs/nilfs2/ioctl.c:99 |
| nilfs_ioctl_get_info fs/nilfs2/ioctl.c:1173 [inline] |
| nilfs_ioctl+0x2402/0x4450 fs/nilfs2/ioctl.c:1290 |
| nilfs_compat_ioctl+0x1b8/0x200 fs/nilfs2/ioctl.c:1343 |
| __do_compat_sys_ioctl fs/ioctl.c:968 [inline] |
| __se_compat_sys_ioctl+0x7dd/0x1000 fs/ioctl.c:910 |
| __ia32_compat_sys_ioctl+0x93/0xd0 fs/ioctl.c:910 |
| do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] |
| __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 |
| do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203 |
| do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246 |
| entry_SYSENTER_compat_after_hwframe+0x70/0x82 |
| |
| Uninit was created at: |
| __alloc_pages+0x9f6/0xe90 mm/page_alloc.c:5572 |
| alloc_pages+0xab0/0xd80 mm/mempolicy.c:2287 |
| __get_free_pages+0x34/0xc0 mm/page_alloc.c:5599 |
| nilfs_ioctl_wrap_copy+0x223/0xc10 fs/nilfs2/ioctl.c:74 |
| nilfs_ioctl_get_info fs/nilfs2/ioctl.c:1173 [inline] |
| nilfs_ioctl+0x2402/0x4450 fs/nilfs2/ioctl.c:1290 |
| nilfs_compat_ioctl+0x1b8/0x200 fs/nilfs2/ioctl.c:1343 |
| __do_compat_sys_ioctl fs/ioctl.c:968 [inline] |
| __se_compat_sys_ioctl+0x7dd/0x1000 fs/ioctl.c:910 |
| __ia32_compat_sys_ioctl+0x93/0xd0 fs/ioctl.c:910 |
| do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] |
| __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 |
| do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203 |
| do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246 |
| entry_SYSENTER_compat_after_hwframe+0x70/0x82 |
| |
| Bytes 16-127 of 3968 are uninitialized |
| ... |
| |
| This eliminates the leak issue by initializing the page allocated as |
| buffer using get_zeroed_page(). |
| |
| The Linux kernel CVE team has assigned CVE-2023-53035 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.14.312 with commit a94932381e8dae4117e9129b3c1282e18aa97b05 |
| Fixed in 4.19.280 with commit 9c5034e9a0e03db8d5e9eabb176340259b5b97e4 |
| Fixed in 5.4.240 with commit 8f5cbf6a8c0e19b062b829c5b7aca01468bb57f6 |
| Fixed in 5.10.177 with commit d18db946cc6a394291539e030df32324285648f7 |
| Fixed in 5.15.105 with commit 5bb105cc72beb9d51bf12f5c657336d2d35bdc5d |
| Fixed in 6.1.22 with commit 5f33b042f74fc9662eba17f4cd19b07d84bbc6c5 |
| Fixed in 6.2.9 with commit 8a6550b365c0ce2e65905de57dcbfe1f7d629726 |
| Fixed in 6.3 with commit 003587000276f81d0114b5ce773d80c119d8cb30 |
| |
| 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-2023-53035 |
| 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/nilfs2/ioctl.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/a94932381e8dae4117e9129b3c1282e18aa97b05 |
| https://git.kernel.org/stable/c/9c5034e9a0e03db8d5e9eabb176340259b5b97e4 |
| https://git.kernel.org/stable/c/8f5cbf6a8c0e19b062b829c5b7aca01468bb57f6 |
| https://git.kernel.org/stable/c/d18db946cc6a394291539e030df32324285648f7 |
| https://git.kernel.org/stable/c/5bb105cc72beb9d51bf12f5c657336d2d35bdc5d |
| https://git.kernel.org/stable/c/5f33b042f74fc9662eba17f4cd19b07d84bbc6c5 |
| https://git.kernel.org/stable/c/8a6550b365c0ce2e65905de57dcbfe1f7d629726 |
| https://git.kernel.org/stable/c/003587000276f81d0114b5ce773d80c119d8cb30 |
