In the Linux kernel 5.3.10, there is a use-after-free (read) in the
perf_trace_lock_acquire function (related to include/trace/events/lock.h).

Tristan Madani discovered that the file locking implementation in the Linux
kernel contained a race condition. A local attacker could possibly use this
to cause a denial of service or expose sensitive information.

sbeattie

first attempted fix was 6d390e4b5d48ec03bb87e63cf0a2bff5f4e116da but that showed performance issues in synthetic benchmarks, more complex fix is dcf23ac3e846ca0cf626c155a0e3fcbbcf4fae8a may be introduced by 16306a61d3b7c433c7a127ec6224867b88ece687 no confirmation that the fixes listed actually address the reporter's issue the conservative fix for this issue may be to just apply 6d390e4b5d48ec03bb87e63cf0a2bff5f4e116da