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Handling anomalous ISA detection #187

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Handling anomalous ISA detection #187

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15 changes: 15 additions & 0 deletions ruapu.h
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,21 @@ static int ruapu_detect_isa(ruapu_some_inst some_inst)
{
g_ruapu_sig_caught = 0;

// Some probe instructions do not fault as a clean SIGILL but raise a SIGSEGV
// with a corrupted stack pointer . The kernel can only deliver such a
// signal on an alternate stack, and the handler below sets SA_ONSTACK, so make
// sure an alternate signal stack is installed. Leave an app-provided one alone.
stack_t old_ss;
if (sigaltstack(NULL, &old_ss) == 0 && (old_ss.ss_flags & SS_DISABLE))
{
static char ruapu_altstack[65536];
stack_t ss;
ss.ss_sp = ruapu_altstack;
ss.ss_size = sizeof(ruapu_altstack);
ss.ss_flags = 0;
sigaltstack(&ss, NULL);
}

struct sigaction sa = { 0 };
struct sigaction old_sa;
sa.sa_flags = SA_ONSTACK | SA_RESTART | SA_SIGINFO;
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