https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70148
Bug ID: 70148
Summary: Feature request: allow overriding the SSP canary
location
Product: gcc
Version: 5.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: luto at kernel dot org
Target Milestone: ---
The 32-bit x86 Linux kernel jumps through ridiculous hoops to but the SSP
canary where GCC expects it. (If I had been paying attention when that code
was written, I would have NAKed it outright -- it's a disaster.) The 64-bit
kernel jumps through less ridiculous hoops.
Can we have the ability to tell GCC what segment override to use and what
offset to use? It would be even better if we could tell GCC what segment
override to use and make GCC emit an absolute symbol reference for the offset
so we could relocate it.
(The 32-bit issue is that GCC insists on using %gs, and Linux would *much*
prefer %fs.)
