cve-2024-41023
Vulnerability from cvelistv5
Published
2024-07-29 14:31
Modified
2024-11-05 09:35
Severity ?
Summary
sched/deadline: Fix task_struct reference leak
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a54d31face626f62de415ebe77b43f76c3ffaf4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b58652db66c910c2245f5bee7deca41c12d707b9
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/deadline: Fix task_struct reference leak\n\nDuring the execution of the following stress test with linux-rt:\n\nstress-ng --cyclic 30 --timeout 30 --minimize --quiet\n\nkmemleak frequently reported a memory leak concerning the task_struct:\n\nunreferenced object 0xffff8881305b8000 (size 16136):\n  comm \"stress-ng\", pid 614, jiffies 4294883961 (age 286.412s)\n  object hex dump (first 32 bytes):\n    02 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00  .@..............\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  debug hex dump (first 16 bytes):\n    53 09 00 00 00 00 00 00 00 00 00 00 00 00 00 00  S...............\n  backtrace:\n    [\u003c00000000046b6790\u003e] dup_task_struct+0x30/0x540\n    [\u003c00000000c5ca0f0b\u003e] copy_process+0x3d9/0x50e0\n    [\u003c00000000ced59777\u003e] kernel_clone+0xb0/0x770\n    [\u003c00000000a50befdc\u003e] __do_sys_clone+0xb6/0xf0\n    [\u003c000000001dbf2008\u003e] do_syscall_64+0x5d/0xf0\n    [\u003c00000000552900ff\u003e] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n\nThe issue occurs in start_dl_timer(), which increments the task_struct\nreference count and sets a timer. The timer callback, dl_task_timer,\nis supposed to decrement the reference count upon expiration. However,\nif enqueue_task_dl() is called before the timer expires and cancels it,\nthe reference count is not decremented, leading to the leak.\n\nThis patch fixes the reference leak by ensuring the task_struct\nreference count is properly decremented when the timer is canceled."
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    "cveId": "CVE-2024-41023",
    "datePublished": "2024-07-29T14:31:40.439Z",
    "dateReserved": "2024-07-12T12:17:45.615Z",
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