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um: pass siginfo to guest process

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UML guest processes now get correct siginfo_t for SIGTRAP, SIGFPE,
SIGILL and SIGBUS. Specifically, si_addr and si_code are now correct
where previously they were si_addr = NULL and si_code = 128.

Signed-off-by: Martin Pärtel <martin.partel@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Martin Pärtel
2012-08-02 00:49:17 +02:00
committed by Richard Weinberger
parent d4afcba95f
commit d3c1cfcdb4
10 changed files with 71 additions and 34 deletions
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39
arch/um/kernel/trap.c
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@@ -172,7 +172,7 @@ void fatal_sigsegv(void)
os_dump_core();
}
void segv_handler(int sig, struct uml_pt_regs *regs)
void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
struct faultinfo * fi = UPT_FAULTINFO(regs);
@@ -258,8 +258,11 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
return 0;
}
void relay_signal(int sig, struct uml_pt_regs *regs)
void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs)
{
struct faultinfo *fi;
struct siginfo clean_si;
if (!UPT_IS_USER(regs)) {
if (sig == SIGBUS)
printk(KERN_ERR "Bus error - the host /dev/shm or /tmp "
@@ -269,18 +272,40 @@ void relay_signal(int sig, struct uml_pt_regs *regs)
arch_examine_signal(sig, regs);
current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);
force_sig(sig, current);
memset(&clean_si, 0, sizeof(clean_si));
clean_si.si_signo = si->si_signo;
clean_si.si_errno = si->si_errno;
clean_si.si_code = si->si_code;
switch (sig) {
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
case SIGTRAP:
fi = UPT_FAULTINFO(regs);
clean_si.si_addr = (void __user *) FAULT_ADDRESS(*fi);
current->thread.arch.faultinfo = *fi;
#ifdef __ARCH_SI_TRAPNO
clean_si.si_trapno = si->si_trapno;
#endif
break;
default:
printk(KERN_ERR "Attempted to relay unknown signal %d (si_code = %d)\n",
sig, si->si_code);
}
force_sig_info(sig, &clean_si, current);
}
void bus_handler(int sig, struct uml_pt_regs *regs)
void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs)
{
if (current->thread.fault_catcher != NULL)
UML_LONGJMP(current->thread.fault_catcher, 1);
else relay_signal(sig, regs);
else
relay_signal(sig, si, regs);
}
void winch(int sig, struct uml_pt_regs *regs)
void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
do_IRQ(WINCH_IRQ, regs);
}