Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix use-after-free in print_graph_function_flags during tracer switching Kairui reported a UAF issue in print_graph_function_flags() during ftrace stress testing [1]. This issue can be reproduced if puting a 'mdelay(10)' after 'mutex_unlock(&trace_types_lock)' in s_start(), and executing the following script: $ echo function_graph > current_tracer $ cat trace > /dev/null & $ sleep 5 # Ensure the 'cat' reaches the 'mdelay(10)' point $ echo timerlat > current_tracer The root cause lies in the two calls to print_graph_function_flags within print_trace_line during each s_show(): * One through 'iter->trace->print_line()'; * Another through 'event->funcs->trace()', which is hidden in print_trace_fmt() before print_trace_line returns. Tracer switching only updates the former, while the latter continues to use the print_line function of the old tracer, which in the script above is print_graph_function_flags. Moreover, when switching from the 'function_graph' tracer to the 'timerlat' tracer, s_start only calls graph_trace_close of the 'function_graph' tracer to free 'iter->private', but does not set it to NULL. This provides an opportunity for 'event->funcs->trace()' to use an invalid 'iter->private'. To fix this issue, set 'iter->private' to NULL immediately after freeing it in graph_trace_close(), ensuring that an invalid pointer is not passed to other tracers. Additionally, clean up the unnecessary 'iter->private = NULL' during each 'cat trace' when using wakeup and irqsoff tracers. [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 05319d707732c728eb721ac616a50e7978eb499a before 42561fe62c3628ea3bc9623f64f047605e98857f; affected b8205dfed68183dc1470e83863c5ded6d7fa30a9 before de7b309139f862a44379ecd96e93c9133c69f813; affected ce6e2b14bc094866d9173db6935da2d752f06d8b before 81a85b12132c8ffe98f5ddbdc185481790aeaa1b; affected 2cb0c037c927db4ec928cc927488e52aa359786e before a2cce54c1748216535dda02e185d07a084be837e; affected eecb91b9f98d6427d4af5fdb8f108f52572a39e7 before 099ef3385800828b74933a96c117574637c3fb3a; affected eecb91b9f98d6427d4af5fdb8f108f52572a39e7 before c85efe6e13743cac6ba4ccf144cb91f44c86231a; affected eecb91b9f98d6427d4af5fdb8f108f52572a39e7 before f14752d66056d0c7bffe5092130409417d3baa70; affected eecb91b9f98d6427d4af5fdb8f108f52572a39e7 before 70be951bc01e4a0e10d443f3510bb17426f257fb; affected eecb91b9f98d6427d4af5fdb8f108f52572a39e7 before 7f81f27b1093e4895e87b74143c59c055c3b1906; affected d6b35c9a8d51032ed9890431da3ae39fe76c1ae3; affected 5d433eda76b66ab271f5924b26ddfec063eeb454; affected 2242640e9bd94e706acf75c60a2ab1d0e150e0fb; affected 5.4.255 before 5.4.292; affected 5.10.193 before 5.10.236; affected 5.15.129 before 5.15.180; affected 6.1.50 before 6.1.134; affected 4.14.324 before 4.15; affected 4.19.293 before 4.20; affected 6.4.13 before 6.5 |
| Linux / Linux | affected 6.5; unaffected 0 before 6.5; unaffected 5.4.292 through 5.4.*; unaffected 5.10.236 through 5.10.*; unaffected 5.15.180 through 5.15.*; unaffected 6.1.134 through 6.1.*; unaffected 6.6.87 through 6.6.*; unaffected 6.12.23 through 6.12.*; unaffected 6.13.11 through 6.13.*; unaffected 6.14.2 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/42561fe62c3628ea3bc9623f64f047605e98857f
- https://git.kernel.org/stable/c/de7b309139f862a44379ecd96e93c9133c69f813
- https://git.kernel.org/stable/c/81a85b12132c8ffe98f5ddbdc185481790aeaa1b
- https://git.kernel.org/stable/c/a2cce54c1748216535dda02e185d07a084be837e
- https://git.kernel.org/stable/c/099ef3385800828b74933a96c117574637c3fb3a
- https://git.kernel.org/stable/c/c85efe6e13743cac6ba4ccf144cb91f44c86231a
- https://git.kernel.org/stable/c/f14752d66056d0c7bffe5092130409417d3baa70
- https://git.kernel.org/stable/c/70be951bc01e4a0e10d443f3510bb17426f257fb
- https://git.kernel.org/stable/c/7f81f27b1093e4895e87b74143c59c055c3b1906
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.