Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func() When a tracepoint goes through the 0 -> 1 transition, tracepoint_add_func() invokes the subsystem's ext->regfunc() before attempting to install the new probe via func_add(). If func_add() then fails (for example, when allocate_probes() cannot allocate a new probe array under memory pressure and returns -ENOMEM), the function returns the error without calling the matching ext->unregfunc(), leaving the side effects of regfunc() behind with no installed probe to justify them. For syscall tracepoints this is particularly unpleasant: syscall_regfunc() bumps sys_tracepoint_refcount and sets SYSCALL_TRACEPOINT on every task. After a leaked failure, the refcount is stuck at a non-zero value with no consumer, and every task continues paying the syscall trace entry/exit overhead until reboot. Other subsystems providing regfunc()/unregfunc() pairs exhibit similarly scoped persistent state. Mirror the existing 1 -> 0 cleanup and call ext->unregfunc() in the func_add() error path, gated on the same condition used there so the unwind is symmetric with the registration.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8cf868affdc459beee1a941df0cfaba1673740e3 before 5787052e5f69beb649f3d6a80a8aa37d9e683e4e; affected 8cf868affdc459beee1a941df0cfaba1673740e3 before 4f1756d043e56ea2e9a6c858fb290a0cf6fc2251; affected 8cf868affdc459beee1a941df0cfaba1673740e3 before 36ff362235307af95152d510b53c2d9b8773a342; affected 8cf868affdc459beee1a941df0cfaba1673740e3 before 247ed8a969f981bfba3112fd4bb441eaa6cef59c; affected 8cf868affdc459beee1a941df0cfaba1673740e3 before 7bcadb3c2bc1cf60690e931aadd35fb7bd646a49; affected 8cf868affdc459beee1a941df0cfaba1673740e3 before 2c5b8eeea006eb694c81631cd5713d494b80be90; affected 8cf868affdc459beee1a941df0cfaba1673740e3 before 342829e042ac00f3d68d442ea92873fb6683f494; affected 8cf868affdc459beee1a941df0cfaba1673740e3 before fad217e16fded7f3c09f8637b0f6a224d58b5f2e |
| Linux / Linux | affected 4.10; unaffected 0 before 4.10; unaffected 5.10.259 through 5.10.*; unaffected 5.15.210 through 5.15.*; unaffected 6.1.176 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.88 through 6.12.*; unaffected 6.18.30 through 6.18.*; unaffected 7.0.7 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/5787052e5f69beb649f3d6a80a8aa37d9e683e4e
- https://git.kernel.org/stable/c/4f1756d043e56ea2e9a6c858fb290a0cf6fc2251
- https://git.kernel.org/stable/c/36ff362235307af95152d510b53c2d9b8773a342
- https://git.kernel.org/stable/c/247ed8a969f981bfba3112fd4bb441eaa6cef59c
- https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49
- https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90
- https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494
- https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e
ADP enrichment
No English description supplied.