| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47190: perf bpf: Avoid memory leak from perf_env__insert_btf() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| perf bpf: Avoid memory leak from perf_env__insert_btf() |
| |
| perf_env__insert_btf() doesn't insert if a duplicate BTF id is |
| encountered and this causes a memory leak. Modify the function to return |
| a success/error value and then free the memory if insertion didn't |
| happen. |
| |
| v2. Adds a return -1 when the insertion error occurs in |
| perf_env__fetch_btf. This doesn't affect anything as the result is |
| never checked. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47190 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.1 with commit 3792cb2ff43b1b193136a03ce1336462a827d792 and fixed in 5.4.162 with commit 642fc22210a5e59d40b1e4d56d21ec3effd401f2 |
| Issue introduced in 5.1 with commit 3792cb2ff43b1b193136a03ce1336462a827d792 and fixed in 5.10.82 with commit 11589d3144bc4e272e0aae46ce8156162e99babc |
| Issue introduced in 5.1 with commit 3792cb2ff43b1b193136a03ce1336462a827d792 and fixed in 5.15.5 with commit ab7c3d8d81c511ddfb27823fb07081c96422b56e |
| Issue introduced in 5.1 with commit 3792cb2ff43b1b193136a03ce1336462a827d792 and fixed in 5.16 with commit 4924b1f7c46711762fd0e65c135ccfbcfd6ded1f |
| |
| 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-2021-47190 |
| 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: |
| tools/perf/util/bpf-event.c |
| tools/perf/util/env.c |
| tools/perf/util/env.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/642fc22210a5e59d40b1e4d56d21ec3effd401f2 |
| https://git.kernel.org/stable/c/11589d3144bc4e272e0aae46ce8156162e99babc |
| https://git.kernel.org/stable/c/ab7c3d8d81c511ddfb27823fb07081c96422b56e |
| https://git.kernel.org/stable/c/4924b1f7c46711762fd0e65c135ccfbcfd6ded1f |
