Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: perf sched: Fix register_pid() overflow, strcpy, and BUG_ON register_pid() has several issues when processing untrusted perf.data: 1. Integer overflow: (pid + 1) * sizeof(struct task_desc *) can wrap to a small value on 32-bit systems when pid is large (e.g. 0x40000000), causing realloc to return a tiny buffer followed by out-of-bounds writes in the initialization loop. 2. Heap buffer overflow: strcpy(task->comm, comm) copies the untrusted comm string into a fixed 20-byte COMM_LEN buffer with no length check. 3. BUG_ON on allocation failure: perf.data is untrusted input, so allocation failures should be handled gracefully rather than killing the process. 4. Realloc of sched->tasks assigned directly back, leaking the old pointer on failure; nr_tasks incremented before the realloc, leaving corrupted state on failure. Cap pid at PID_MAX_LIMIT (4194304, matching the kernel's maximum on 64-bit), replace strcpy with strlcpy, guard against NULL comm, replace BUG_ON with NULL returns using safe realloc patterns, and add NULL checks in callers that dereference the result.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ec156764d424dd67283c2cd5e9f6f1b8388364ac before 344e59fc4f2cba6dc04ce5e2a77388645d4ca834; affected ec156764d424dd67283c2cd5e9f6f1b8388364ac before 22263d241bad753217d545f8085b7ead52e2873b; affected ec156764d424dd67283c2cd5e9f6f1b8388364ac before 2003918e13f43cf6c5698be3cc9aa3657dd676a8; affected ec156764d424dd67283c2cd5e9f6f1b8388364ac before 29639f00bfa49da7904ba0a499e0da7a0e5d735e; affected ec156764d424dd67283c2cd5e9f6f1b8388364ac before 261d2b5f4afa0570ca906e553c93811c5abe4590; affected ec156764d424dd67283c2cd5e9f6f1b8388364ac before 652cea73b7b7b7c622a2be670e44e3c499c6d49f; affected ec156764d424dd67283c2cd5e9f6f1b8388364ac before 5ea1dcc9418c4e06ce29ed5170596f497ba86872; affected ec156764d424dd67283c2cd5e9f6f1b8388364ac before 5949d339f5ec98752d56dcd4e36f619a59d513a5 |
| Linux / Linux | affected 2.6.32; unaffected 0 before 2.6.32; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/344e59fc4f2cba6dc04ce5e2a77388645d4ca834
- https://git.kernel.org/stable/c/22263d241bad753217d545f8085b7ead52e2873b
- https://git.kernel.org/stable/c/2003918e13f43cf6c5698be3cc9aa3657dd676a8
- https://git.kernel.org/stable/c/29639f00bfa49da7904ba0a499e0da7a0e5d735e
- https://git.kernel.org/stable/c/261d2b5f4afa0570ca906e553c93811c5abe4590
- https://git.kernel.org/stable/c/652cea73b7b7b7c622a2be670e44e3c499c6d49f
- https://git.kernel.org/stable/c/5ea1dcc9418c4e06ce29ed5170596f497ba86872
- https://git.kernel.org/stable/c/5949d339f5ec98752d56dcd4e36f619a59d513a5