| 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-2022-49870: capabilities: fix undefined behavior in bit shift for CAP_TO_MASK |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| capabilities: fix undefined behavior in bit shift for CAP_TO_MASK |
| |
| Shifting signed 32-bit value by 31 bits is undefined, so changing |
| significant bit to unsigned. The UBSAN warning calltrace like below: |
| |
| UBSAN: shift-out-of-bounds in security/commoncap.c:1252:2 |
| left shift of 1 by 31 places cannot be represented in type 'int' |
| Call Trace: |
| <TASK> |
| dump_stack_lvl+0x7d/0xa5 |
| dump_stack+0x15/0x1b |
| ubsan_epilogue+0xe/0x4e |
| __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c |
| cap_task_prctl+0x561/0x6f0 |
| security_task_prctl+0x5a/0xb0 |
| __x64_sys_prctl+0x61/0x8f0 |
| do_syscall_64+0x58/0x80 |
| entry_SYSCALL_64_after_hwframe+0x63/0xcd |
| </TASK> |
| |
| The Linux kernel CVE team has assigned CVE-2022-49870 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.25 with commit e338d263a76af78fe8f38a72131188b58fceb591 and fixed in 4.9.334 with commit 5b79fa628e2ab789e629a83cd211ef9b4c1a593e |
| Issue introduced in 2.6.25 with commit e338d263a76af78fe8f38a72131188b58fceb591 and fixed in 4.14.300 with commit 65b0bc7a0690861812ade523d19f82688ab819dc |
| Issue introduced in 2.6.25 with commit e338d263a76af78fe8f38a72131188b58fceb591 and fixed in 4.19.267 with commit dbaab08c8677d598244d21afb7818e44e1c5d826 |
| Issue introduced in 2.6.25 with commit e338d263a76af78fe8f38a72131188b58fceb591 and fixed in 5.4.225 with commit 5661f111a1616ac105ec8cec81bff99b60f847ac |
| Issue introduced in 2.6.25 with commit e338d263a76af78fe8f38a72131188b58fceb591 and fixed in 5.10.155 with commit fcbd2b336834bd24e1d9454ad5737856470c10d7 |
| Issue introduced in 2.6.25 with commit e338d263a76af78fe8f38a72131188b58fceb591 and fixed in 5.15.79 with commit 151dc8087b5609e53b069c068e3f3ee100efa586 |
| Issue introduced in 2.6.25 with commit e338d263a76af78fe8f38a72131188b58fceb591 and fixed in 6.0.9 with commit 27bdb134c043ff32c459d98f16550d0ffa0b3c34 |
| Issue introduced in 2.6.25 with commit e338d263a76af78fe8f38a72131188b58fceb591 and fixed in 6.1 with commit 46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13 |
| |
| 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-2022-49870 |
| 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: |
| include/uapi/linux/capability.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/5b79fa628e2ab789e629a83cd211ef9b4c1a593e |
| https://git.kernel.org/stable/c/65b0bc7a0690861812ade523d19f82688ab819dc |
| https://git.kernel.org/stable/c/dbaab08c8677d598244d21afb7818e44e1c5d826 |
| https://git.kernel.org/stable/c/5661f111a1616ac105ec8cec81bff99b60f847ac |
| https://git.kernel.org/stable/c/fcbd2b336834bd24e1d9454ad5737856470c10d7 |
| https://git.kernel.org/stable/c/151dc8087b5609e53b069c068e3f3ee100efa586 |
| https://git.kernel.org/stable/c/27bdb134c043ff32c459d98f16550d0ffa0b3c34 |
| https://git.kernel.org/stable/c/46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13 |
