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linux-user: Detect and report host SIGILL, SIGFPE, SIGTRAP

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These signals, when not spoofed via kill(), are always bugs.
Use die_from_signal to report this sensibly.

Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-08-22 22:07:41 -07:00
parent f4e1168198
commit 4a6ebc19a7
1 changed files with 43 additions and 1 deletions
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44
linux-user/signal.c
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@ -796,6 +796,43 @@ void die_from_signal(siginfo_t *info)
break; break;
} }
break; break;
case SIGILL:
sig = "ILL";
switch (info->si_code) {
case ILL_ILLOPC:
code = "ILLOPC";
break;
case ILL_ILLOPN:
code = "ILLOPN";
break;
case ILL_ILLADR:
code = "ILLADR";
break;
case ILL_PRVOPC:
code = "PRVOPC";
break;
case ILL_PRVREG:
code = "PRVREG";
break;
case ILL_COPROC:
code = "COPROC";
break;
}
break;
case SIGFPE:
sig = "FPE";
switch (info->si_code) {
case FPE_INTDIV:
code = "INTDIV";
break;
case FPE_INTOVF:
code = "INTOVF";
break;
}
break;
case SIGTRAP:
sig = "TRAP";
break;
default: default:
snprintf(sigbuf, sizeof(sigbuf), "%d", info->si_signo); snprintf(sigbuf, sizeof(sigbuf), "%d", info->si_signo);
sig = sigbuf; sig = sigbuf;
@ -900,7 +937,8 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
/* /*
* Non-spoofed SIGSEGV and SIGBUS are synchronous, and need special * Non-spoofed SIGSEGV and SIGBUS are synchronous, and need special
* handling wrt signal blocking and unwinding. * handling wrt signal blocking and unwinding. Non-spoofed SIGILL,
* SIGFPE, SIGTRAP are always host bugs.
*/ */
if (info->si_code > 0) { if (info->si_code > 0) {
switch (host_sig) { switch (host_sig) {
@ -912,6 +950,10 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
host_sigbus_handler(cpu, info, uc); host_sigbus_handler(cpu, info, uc);
sync_sig = true; sync_sig = true;
break; break;
case SIGILL:
case SIGFPE:
case SIGTRAP:
die_from_signal(info);
} }
} }