Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix invalid address access in lookup_rec() when index is 0 KASAN reported follow problem: BUG: KASAN: use-after-free in lookup_rec Read of size 8 at addr ffff000199270ff0 by task modprobe CPU: 2 Comm: modprobe Call trace: kasan_report __asan_load8 lookup_rec ftrace_location arch_check_ftrace_location check_kprobe_address_safe register_kprobe When checking pg->records[pg->index - 1].ip in lookup_rec(), it can get a pg which is newly added to ftrace_pages_start in ftrace_process_locs(). Before the first pg->index++, index is 0 and accessing pg->records[-1].ip will cause this problem. Don't check the ip when pg->index is 0.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 9644302e3315e7e36495d230d5ac7125a316d33e before 2de28e5ce34b22b73b833a21e2c45ae3aade3964; affected 9644302e3315e7e36495d230d5ac7125a316d33e before 7569ee04b0e3b32df79f64db3a7138573edad9bc; affected 9644302e3315e7e36495d230d5ac7125a316d33e before ac58b88ccbbb8e9fb83e137cee04a856b1ea6635; affected 9644302e3315e7e36495d230d5ac7125a316d33e before 83c3b2f4e7c61367c7b24551f4c6eb94bbdda283; affected 9644302e3315e7e36495d230d5ac7125a316d33e before 2a0d71fabfeb349216d33f001a6421b1768bd3a9; affected 9644302e3315e7e36495d230d5ac7125a316d33e before 4f84f31f63416b0f02fc146ffdc4ab32723eb7e8; affected 9644302e3315e7e36495d230d5ac7125a316d33e before f1bd8b7fd890d87d0dc4dedc6287ea34dd07c0b4; affected 9644302e3315e7e36495d230d5ac7125a316d33e before ee92fa443358f4fc0017c1d0d325c27b37802504 |
| Linux / Linux | affected 3.5; unaffected 0 before 3.5; unaffected 4.14.311 through 4.14.*; unaffected 4.19.279 through 4.19.*; unaffected 5.4.238 through 5.4.*; unaffected 5.10.176 through 5.10.*; unaffected 5.15.104 through 5.15.*; unaffected 6.1.21 through 6.1.*; unaffected 6.2.8 through 6.2.*; unaffected 6.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/2de28e5ce34b22b73b833a21e2c45ae3aade3964
- https://git.kernel.org/stable/c/7569ee04b0e3b32df79f64db3a7138573edad9bc
- https://git.kernel.org/stable/c/ac58b88ccbbb8e9fb83e137cee04a856b1ea6635
- https://git.kernel.org/stable/c/83c3b2f4e7c61367c7b24551f4c6eb94bbdda283
- https://git.kernel.org/stable/c/2a0d71fabfeb349216d33f001a6421b1768bd3a9
- https://git.kernel.org/stable/c/4f84f31f63416b0f02fc146ffdc4ab32723eb7e8
- https://git.kernel.org/stable/c/f1bd8b7fd890d87d0dc4dedc6287ea34dd07c0b4
- https://git.kernel.org/stable/c/ee92fa443358f4fc0017c1d0d325c27b37802504