On 5/23/24 16:28, Dave Hansen wrote:
On 5/23/24 05:33, Alexandre Chartre wrote:The problem can be reproduced with the following sequence: $ cat sysenter_step.c int main() { asm("pushf; pop %ax; bts $8,%ax; push %ax; popf; sysenter"); } $ gcc -o sysenter_step sysenter_step.c $ ./sysenter_step Segmentation fault (core dumped) The program is expected to crash, and the #DB handler will issue a warning.Should we wrap up this gem and put it with the other entry selftests?
It looks like tools/testing/selftests/x86/single_step_syscall.c tests sysenter with TF set but it doesn't check if the kernel issues any warning. alex.
