CVE-2022-49802
ftrace: Fix null pointer dereference in ftrace_add_mod()
In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix null pointer dereference in ftrace_add_mod() The @ftrace_mod is allocated by kzalloc(), so both the members {prev,next} of @ftrace_mode->list are NULL, it's not a valid state to call list_del(). If kstrdup() for @ftrace_mod->{func|module} fails, it goes to @out_free tag and calls free_ftrace_mod() to destroy @ftrace_mod, then list_del() will write prev->next and next->prev, where null pointer dereference happens. BUG: kernel NULL pointer dereference, address: 0000000000000008 Oops: 0002 [#1] PREEMPT SMP NOPTI Call Trace: <TASK> ftrace_mod_callback+0x20d/0x220 ? do_filp_open+0xd9/0x140 ftrace_process_regex.isra.51+0xbf/0x130 ftrace_regex_write.isra.52.part.53+0x6e/0x90 vfs_write+0xee/0x3a0 ? __audit_filter_op+0xb1/0x100 ? auditd_test_task+0x38/0x50 ksys_write+0xa5/0xe0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Kernel panic - not syncing: Fatal exception So call INIT_LIST_HEAD() to initialize the list member to fix this issue.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 673feb9d76ab3eddde7acfd94b206e321cfc90b9; < 665b4c6648bf2b91f69b33817f4321cf4c3cafe9 (affected, git) ≥ 673feb9d76ab3eddde7acfd94b206e321cfc90b9; < b5bfc61f541d3f092b13dedcfe000d86eb8e133c (affected, git) ≥ 673feb9d76ab3eddde7acfd94b206e321cfc90b9; < f715f31559b82e3f75ce047fa476de63d8107584 (affected, git) ≥ 673feb9d76ab3eddde7acfd94b206e321cfc90b9; < 6a14828caddad0d989495a72af678adf60992704 (affected, git) ≥ 673feb9d76ab3eddde7acfd94b206e321cfc90b9; < 1bea037a1abb23a6729bef36a2265a4565f5ea77 (affected, git) ≥ 673feb9d76ab3eddde7acfd94b206e321cfc90b9; < 6e50eb4b1807017f6c2d5089064256ce2de8aef1 (affected, git) ≥ 673feb9d76ab3eddde7acfd94b206e321cfc90b9; < 19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
4.13 (affected) ≥ 0; < 4.13 (unaffected, semver) ≥ 4.14.300; ≤ 4.14.* (unaffected, semver) ≥ 4.19.267; ≤ 4.19.* (unaffected, semver) ≥ 5.4.225; ≤ 5.4.* (unaffected, semver) ≥ 5.10.156; ≤ 5.10.* (unaffected, semver) ≥ 5.15.80; ≤ 5.15.* (unaffected, semver) ≥ 6.0.10; ≤ 6.0.* (unaffected, semver) ≥ 6.1; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9CNA: Linux
- https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133cCNA: Linux
- https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584CNA: Linux
- https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704CNA: Linux
- https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77CNA: Linux
- https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1CNA: Linux
- https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0CNA: Linux
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