Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: sched/deadline: Fix task_struct reference leak During the execution of the following stress test with linux-rt: stress-ng --cyclic 30 --timeout 30 --minimize --quiet kmemleak frequently reported a memory leak concerning the task_struct: unreferenced object 0xffff8881305b8000 (size 16136): comm "stress-ng", pid 614, jiffies 4294883961 (age 286.412s) object hex dump (first 32 bytes): 02 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 .@.............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ debug hex dump (first 16 bytes): 53 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00 S............... backtrace: [<00000000046b6790>] dup_task_struct+0x30/0x540 [<00000000c5ca0f0b>] copy_process+0x3d9/0x50e0 [<00000000ced59777>] kernel_clone+0xb0/0x770 [<00000000a50befdc>] __do_sys_clone+0xb6/0xf0 [<000000001dbf2008>] do_syscall_64+0x5d/0xf0 [<00000000552900ff>] entry_SYSCALL_64_after_hwframe+0x6e/0x76 The issue occurs in start_dl_timer(), which increments the task_struct reference count and sets a timer. The timer callback, dl_task_timer, is supposed to decrement the reference count upon expiration. However, if enqueue_task_dl() is called before the timer expires and cancels it, the reference count is not decremented, leading to the leak. This patch fixes the reference leak by ensuring the task_struct reference count is properly decremented when the timer is canceled.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected feff2e65efd8d84cf831668e182b2ce73c604bbb before f8005214946fd1d9fefdeff19c6ce46d60de2cef; affected feff2e65efd8d84cf831668e182b2ce73c604bbb before 7a54d31face626f62de415ebe77b43f76c3ffaf4; affected feff2e65efd8d84cf831668e182b2ce73c604bbb before b58652db66c910c2245f5bee7deca41c12d707b9; affected f0e1c1d8ff908a39dd42e723d08f104505dfa601; affected 184c8ab5342450c4ae6fc5d937f9bb06c620dcf1; affected 4.19.257 before 4.20; affected 5.4.212 before 5.5 |
| Linux / Linux | affected 5.10; unaffected 0 before 5.10; unaffected 6.6.160 through 6.6.*; unaffected 6.9.10 through 6.9.*; unaffected 6.10 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/f8005214946fd1d9fefdeff19c6ce46d60de2cef
- https://git.kernel.org/stable/c/7a54d31face626f62de415ebe77b43f76c3ffaf4
- https://git.kernel.org/stable/c/b58652db66c910c2245f5bee7deca41c12d707b9
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.