Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject sleepable kprobe_multi programs at attach time kprobe.multi programs run in atomic/RCU context and cannot sleep. However, bpf_kprobe_multi_link_attach() did not validate whether the program being attached had the sleepable flag set, allowing sleepable helpers such as bpf_copy_from_user() to be invoked from a non-sleepable context. This causes a "sleeping function called from invalid context" splat: BUG: sleeping function called from invalid context at ./include/linux/uaccess.h:169 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1787, name: sudo preempt_count: 1, expected: 0 RCU nest depth: 2, expected: 0 Fix this by rejecting sleepable programs early in bpf_kprobe_multi_link_attach(), before any further processing.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0dcac272540613d41c05e89679e4ddb978b612f1 before 89327ed787746a7aa4db3c97f91d2e294228932b; affected 0dcac272540613d41c05e89679e4ddb978b612f1 before d97b19fe5265f7901b2c862f88a4eb1b129a0b61; affected 0dcac272540613d41c05e89679e4ddb978b612f1 before dc9a060d76c12b23c5f378ee115d5e5d03d8bbf3; affected 0dcac272540613d41c05e89679e4ddb978b612f1 before f952157e695fd434bdc05af63a703bb082a78717; affected 0dcac272540613d41c05e89679e4ddb978b612f1 before eb7024bfcc5f68ed11ed9dd4891a3073c15f04a8 |
| Linux / Linux | affected 5.18; unaffected 0 before 5.18; unaffected 6.6.144 through 6.6.*; unaffected 6.12.95 through 6.12.*; unaffected 6.18.22 through 6.18.*; unaffected 6.19.12 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/89327ed787746a7aa4db3c97f91d2e294228932b
- https://git.kernel.org/stable/c/d97b19fe5265f7901b2c862f88a4eb1b129a0b61
- https://git.kernel.org/stable/c/dc9a060d76c12b23c5f378ee115d5e5d03d8bbf3
- https://git.kernel.org/stable/c/f952157e695fd434bdc05af63a703bb082a78717
- https://git.kernel.org/stable/c/eb7024bfcc5f68ed11ed9dd4891a3073c15f04a8