glibc 2.19 - asyn-signal safe TLS and ASan.

[Siddhesh Poyarekar]

On Fri, Jan 24, 2014 at 11:46:22AM +0530, Siddhesh Poyarekar wrote:
> On Thu, Jan 23, 2014 at 01:59:08PM -0800, Andrew Hunter wrote:
> > FYI -- you could easily do the same thing with calls to
> > signal_safe_memalign from libc as a stopgap.  (Well, we'd need to
> > export the symbols from libc, like I wanted to in the first place.)
> 
> Or we could just add a thread-local flag that malloc looks at and if
> set, short-circuits its way to mmap and have signal_safe_malloc use
> it:

Jakub pointed out to me offline that this won't work when applications
override malloc.  The alternate malloc may not necessarily be
async-signal safe and we'll have the same problem all over again.

Siddhesh