commit a1d3a23e27e9f79f4a230e6db5a210e502da03a5
author Peter Collingbourne <peter@pcc.me.uk> Tue Jan 05 19:03:03 2021 -0800
committer Copybara-Service <copybara-worker@google.com> Thu Mar 25 16:02:00 2021 -0700
tree 78deea931c0b33cab0605b2aa57eee62f9e6fb58
parent a88964c5c26d93c778db9300ede4034eb8bf4e34

scudo: Add support for tracking stack traces of secondary allocations.

There is no centralized store of information related to secondary
allocations. Moreover the allocations themselves become inaccessible
when the allocation is freed in order to implement UAF detection,
so we can't store information there to be used in case of UAF
anyway.

Therefore our storage location for tracking stack traces of secondary
allocations is a ring buffer. The ring buffer is copied to the process
creating the crash dump when a fault occurs.

The ring buffer is also used to store stack traces for primary
deallocations. Stack traces for primary allocations continue to be
stored inline.

In order to support the scenario where an access to the ring buffer
is interrupted by a concurrently occurring crash, the ring buffer is
accessed in a lock-free manner.

Differential Revision: https://reviews.llvm.org/D94212

GitOrigin-RevId: 1f55fa0b99e0755c96bfd5cd0cdbe9cbc26fe2db