On Tue, 25 Sep 2018 13:39:36 -0400 (EDT) Mathieu Desnoyers mathieu.desnoyers@efficios.com wrote:
----- On Sep 18, 2018, at 9:53 AM, Mathieu Desnoyers mathieu.desnoyers@efficios.com wrote:
On x86-64, the parametrized selftest code for rseq crashes with a segmentation fault when compiled with -fpie. This happens when the param_test binary is loaded at an address beyond 32-bit on x86-64.
The issue is caused by use of a 32-bit register to hold the address of the loop counter variable.
Fix this by using a 64-bit register to calculate the address of the loop counter variables as an offset from rip.
Should this fix go through tip or the selftests tree ?
I usually have changes like this pulled through Shuah's tree with an ack from the maintainer of the code that it tests.
-- Steve