diff options
| author | Andy Lutomirski <luto@kernel.org> | 2020-11-02 11:51:10 -0800 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-11-24 13:46:16 +0100 |
| commit | 716572b0003ef67a4889bd7d85baf5099c5a0248 (patch) | |
| tree | d8e205314e9865d8bb9c078735fda51a38b7c512 /tools/testing/selftests/x86 | |
| parent | b023fd5f741f34d2cd90258ccc3f245924d2eadd (diff) | |
selftests/x86/fsgsbase: Fix GS == 1, 2, and 3 tests
Setting GS to 1, 2, or 3 causes a nonsensical part of the IRET microcode
to change GS back to zero on a return from kernel mode to user mode. The
result is that these tests fail randomly depending on when interrupts
happen. Detect when this happens and let the test pass.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/7567fd44a1d60a9424f25b19a998f12149993b0d.1604346596.git.luto@kernel.org
Diffstat (limited to 'tools/testing/selftests/x86')
| -rw-r--r-- | tools/testing/selftests/x86/fsgsbase.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/tools/testing/selftests/x86/fsgsbase.c b/tools/testing/selftests/x86/fsgsbase.c index 7161cfc2e60b..8c780cce941d 100644 --- a/tools/testing/selftests/x86/fsgsbase.c +++ b/tools/testing/selftests/x86/fsgsbase.c @@ -392,8 +392,8 @@ static void set_gs_and_switch_to(unsigned long local, local = read_base(GS); /* - * Signal delivery seems to mess up weird selectors. Put it - * back. + * Signal delivery is quite likely to change a selector + * of 1, 2, or 3 back to 0 due to IRET being defective. */ asm volatile ("mov %0, %%gs" : : "rm" (force_sel)); } else { @@ -411,6 +411,14 @@ static void set_gs_and_switch_to(unsigned long local, if (base == local && sel_pre_sched == sel_post_sched) { printf("[OK]\tGS/BASE remained 0x%hx/0x%lx\n", sel_pre_sched, local); + } else if (base == local && sel_pre_sched >= 1 && sel_pre_sched <= 3 && + sel_post_sched == 0) { + /* + * IRET is misdesigned and will squash selectors 1, 2, or 3 + * to zero. Don't fail the test just because this happened. + */ + printf("[OK]\tGS/BASE changed from 0x%hx/0x%lx to 0x%hx/0x%lx because IRET is defective\n", + sel_pre_sched, local, sel_post_sched, base); } else { nerrs++; printf("[FAIL]\tGS/BASE changed from 0x%hx/0x%lx to 0x%hx/0x%lx\n", |