Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: perf/x86/lbr: Filter vsyscall addresses We found that a panic can occur when a vsyscall is made while LBR sampling is active. If the vsyscall is interrupted (NMI) for perf sampling, this call sequence can occur (most recent at top): __insn_get_emulate_prefix() insn_get_emulate_prefix() insn_get_prefixes() insn_get_opcode() decode_branch_type() get_branch_type() intel_pmu_lbr_filter() intel_pmu_handle_irq() perf_event_nmi_handler() Within __insn_get_emulate_prefix() at frame 0, a macro is called: peek_nbyte_next(insn_byte_t, insn, i) Within this macro, this dereference occurs: (insn)->next_byte Inspecting registers at this point, the value of the next_byte field is the address of the vsyscall made, for example the location of the vsyscall version of gettimeofday() at 0xffffffffff600000. The access to an address in the vsyscall region will trigger an oops due to an unhandled page fault. To fix the bug, filtering for vsyscalls can be done when determining the branch type. This patch will return a "none" branch if a kernel address if found to lie in the vsyscall region.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 808b64565b028bd072c985624d5cbe4b6f5a5a35 before 3863989497652488a50f00e96de4331e5efabc6c; affected 808b64565b028bd072c985624d5cbe4b6f5a5a35 before f71edacbd4f99c0e12fe4a4007ab4d687d0688db; affected 808b64565b028bd072c985624d5cbe4b6f5a5a35 before e53899771a02f798d436655efbd9d4b46c0f9265 |
| Linux / Linux | affected 5.16; unaffected 0 before 5.16; unaffected 6.1.59 through 6.1.*; unaffected 6.5.8 through 6.5.*; unaffected 6.6 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/3863989497652488a50f00e96de4331e5efabc6c
- https://git.kernel.org/stable/c/f71edacbd4f99c0e12fe4a4007ab4d687d0688db
- https://git.kernel.org/stable/c/e53899771a02f798d436655efbd9d4b46c0f9265
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.