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.par...@gmail.com>
---
Removed _ignore_siginfo wrappers as requested.
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/include/shared/as-layout.h
linux-3.4.1-mod/arch/um/include/shared/as-layout.h
--- linux-3.4.1/arch/um/include/shared/as-layout.h 2012-06-01
10:18:44.000000000 +0300
+++ linux-3.4.1-mod/arch/um/include/shared/as-layout.h 2012-06-15
13:55:32.817111341 +0300
@@ -60,7 +60,8 @@ extern unsigned long host_task_size;
extern int linux_main(int argc, char **argv);
-extern void (*sig_info[])(int, struct uml_pt_regs *);
+struct siginfo;
+extern void (*sig_info[])(int, struct siginfo *si, struct uml_pt_regs *);
#endif
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/include/shared/irq_user.h
linux-3.4.1-mod/arch/um/include/shared/irq_user.h
--- linux-3.4.1/arch/um/include/shared/irq_user.h 2012-06-01
10:18:44.000000000 +0300
+++ linux-3.4.1-mod/arch/um/include/shared/irq_user.h 2012-06-21
10:40:17.579071501 +0300
@@ -20,7 +20,8 @@ struct irq_fd {
enum { IRQ_READ, IRQ_WRITE };
-extern void sigio_handler(int sig, struct uml_pt_regs *regs);
+struct siginfo;
+extern void sigio_handler(int sig, struct siginfo *unused_si, struct
uml_pt_regs *regs);
extern void free_irq_by_fd(int fd);
extern void reactivate_fd(int fd, int irqnum);
extern void deactivate_fd(int fd, int irqnum);
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/include/shared/kern_util.h
linux-3.4.1-mod/arch/um/include/shared/kern_util.h
--- linux-3.4.1/arch/um/include/shared/kern_util.h 2012-06-01
10:18:44.000000000 +0300
+++ linux-3.4.1-mod/arch/um/include/shared/kern_util.h 2012-06-21
10:31:23.204318601 +0300
@@ -9,6 +9,8 @@
#include "sysdep/ptrace.h"
#include "sysdep/faultinfo.h"
+struct siginfo;
+
extern int uml_exitcode;
extern int ncpus;
@@ -22,7 +24,7 @@ extern void free_stack(unsigned long sta
extern int do_signal(void);
extern void interrupt_end(void);
-extern void relay_signal(int sig, struct uml_pt_regs *regs);
+extern void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs
*regs);
extern unsigned long segv(struct faultinfo fi, unsigned long ip,
int is_user, struct uml_pt_regs *regs);
@@ -33,9 +35,8 @@ extern unsigned int do_IRQ(int irq, stru
extern int smp_sigio_handler(void);
extern void initial_thread_cb(void (*proc)(void *), void *arg);
extern int is_syscall(unsigned long addr);
-extern void timer_handler(int sig, struct uml_pt_regs *regs);
-extern void timer_handler(int sig, struct uml_pt_regs *regs);
+extern void timer_handler(int sig, struct siginfo *unused_si, struct
uml_pt_regs *regs);
extern int start_uml(void);
extern void paging_init(void);
@@ -59,9 +60,9 @@ extern unsigned long from_irq_stack(int
extern void syscall_trace(struct uml_pt_regs *regs, int entryexit);
extern int singlestepping(void *t);
-extern void segv_handler(int sig, struct uml_pt_regs *regs);
-extern void bus_handler(int sig, struct uml_pt_regs *regs);
-extern void winch(int sig, struct uml_pt_regs *regs);
+extern void segv_handler(int sig, struct siginfo *unused_si, struct
uml_pt_regs *regs);
+extern void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs);
+extern void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs
*regs);
extern void fatal_sigsegv(void) __attribute__ ((noreturn));
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/kernel/irq.c linux-3.4.1-mod/arch/um/kernel/irq.c
--- linux-3.4.1/arch/um/kernel/irq.c 2012-06-01 10:18:44.000000000 +0300
+++ linux-3.4.1-mod/arch/um/kernel/irq.c 2012-06-21 10:30:42.036317885
+0300
@@ -30,7 +30,7 @@ static struct irq_fd **last_irq_ptr = &a
extern void free_irqs(void);
-void sigio_handler(int sig, struct uml_pt_regs *regs)
+void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs
*regs)
{
struct irq_fd *irq_fd;
int n;
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/kernel/time.c linux-3.4.1-mod/arch/um/kernel/time.c
--- linux-3.4.1/arch/um/kernel/time.c 2012-06-01 10:18:44.000000000 +0300
+++ linux-3.4.1-mod/arch/um/kernel/time.c 2012-06-21 10:31:15.852318471
+0300
@@ -13,7 +13,7 @@
#include "kern_util.h"
#include "os.h"
-void timer_handler(int sig, struct uml_pt_regs *regs)
+void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs
*regs)
{
unsigned long flags;
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/kernel/trap.c linux-3.4.1-mod/arch/um/kernel/trap.c
--- linux-3.4.1/arch/um/kernel/trap.c 2012-06-01 10:18:44.000000000 +0300
+++ linux-3.4.1-mod/arch/um/kernel/trap.c 2012-06-21 10:30:13.880317394
+0300
@@ -158,7 +158,7 @@ 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);
@@ -244,8 +244,11 @@ unsigned long segv(struct faultinfo fi,
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 "
@@ -255,18 +258,40 @@ void relay_signal(int sig, struct uml_pt
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);
}
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/os-Linux/internal.h
linux-3.4.1-mod/arch/um/os-Linux/internal.h
--- linux-3.4.1/arch/um/os-Linux/internal.h 2012-06-01 10:18:44.000000000
+0300
+++ linux-3.4.1-mod/arch/um/os-Linux/internal.h 2012-06-21 10:32:11.956319450
+0300
@@ -1 +1 @@
-void alarm_handler(int, mcontext_t *);
+void alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc);
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/os-Linux/signal.c linux-3.4.1-mod/arch/um/os-Linux/signal.c
--- linux-3.4.1/arch/um/os-Linux/signal.c 2012-06-01 10:18:44.000000000
+0300
+++ linux-3.4.1-mod/arch/um/os-Linux/signal.c 2012-06-21 10:34:42.668322074
+0300
@@ -13,8 +13,9 @@
#include "kern_util.h"
#include "os.h"
#include "sysdep/mcontext.h"
+#include "internal.h"
-void (*sig_info[NSIG])(int, struct uml_pt_regs *) = {
+void (*sig_info[NSIG])(int, siginfo_t *, struct uml_pt_regs *) = {
[SIGTRAP] = relay_signal,
[SIGFPE] = relay_signal,
[SIGILL] = relay_signal,
@@ -24,7 +25,7 @@ void (*sig_info[NSIG])(int, struct uml_p
[SIGIO] = sigio_handler,
[SIGVTALRM] = timer_handler };
-static void sig_handler_common(int sig, mcontext_t *mc)
+static void sig_handler_common(int sig, siginfo_t *si, mcontext_t *mc)
{
struct uml_pt_regs r;
int save_errno = errno;
@@ -40,7 +41,7 @@ static void sig_handler_common(int sig,
if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM))
unblock_signals();
- (*sig_info[sig])(sig, &r);
+ (*sig_info[sig])(sig, si, &r);
errno = save_errno;
}
@@ -60,7 +61,7 @@ static void sig_handler_common(int sig,
static int signals_enabled;
static unsigned int signals_pending;
-void sig_handler(int sig, mcontext_t *mc)
+void sig_handler(int sig, siginfo_t *si, mcontext_t *mc)
{
int enabled;
@@ -72,7 +73,7 @@ void sig_handler(int sig, mcontext_t *mc
block_signals();
- sig_handler_common(sig, mc);
+ sig_handler_common(sig, si, mc);
set_signals(enabled);
}
@@ -85,10 +86,10 @@ static void real_alarm_handler(mcontext_
get_regs_from_mc(®s, mc);
regs.is_user = 0;
unblock_signals();
- timer_handler(SIGVTALRM, ®s);
+ timer_handler(SIGVTALRM, NULL, ®s);
}
-void alarm_handler(int sig, mcontext_t *mc)
+void alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
{
int enabled;
@@ -119,7 +120,7 @@ void set_sigstack(void *sig_stack, int s
panic("enabling signal stack failed, errno = %d\n", errno);
}
-static void (*handlers[_NSIG])(int sig, mcontext_t *mc) = {
+static void (*handlers[_NSIG])(int sig, siginfo_t *si, mcontext_t *mc) = {
[SIGSEGV] = sig_handler,
[SIGBUS] = sig_handler,
[SIGILL] = sig_handler,
@@ -132,7 +133,7 @@ static void (*handlers[_NSIG])(int sig,
};
-static void hard_handler(int sig, siginfo_t *info, void *p)
+static void hard_handler(int sig, siginfo_t *si, void *p)
{
struct ucontext *uc = p;
mcontext_t *mc = &uc->uc_mcontext;
@@ -161,7 +162,7 @@ static void hard_handler(int sig, siginf
while ((sig = ffs(pending)) != 0){
sig--;
pending &= ~(1 << sig);
- (*handlers[sig])(sig, mc);
+ (*handlers[sig])(sig, si, mc);
}
/*
@@ -273,9 +274,12 @@ void unblock_signals(void)
* Deal with SIGIO first because the alarm handler might
* schedule, leaving the pending SIGIO stranded until we come
* back here.
+ *
+ * SIGIO's handler doesn't use siginfo or mcontext,
+ * so they can be NULL.
*/
if (save_pending & SIGIO_MASK)
- sig_handler_common(SIGIO, NULL);
+ sig_handler_common(SIGIO, NULL, NULL);
if (save_pending & SIGVTALRM_MASK)
real_alarm_handler(NULL);
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/os-Linux/skas/process.c
linux-3.4.1-mod/arch/um/os-Linux/skas/process.c
--- linux-3.4.1/arch/um/os-Linux/skas/process.c 2012-06-01 10:18:44.000000000
+0300
+++ linux-3.4.1-mod/arch/um/os-Linux/skas/process.c 2012-06-15
13:56:58.261111142 +0300
@@ -346,6 +346,7 @@ void userspace(struct uml_pt_regs *regs)
int err, status, op, pid = userspace_pid[0];
/* To prevent races if using_sysemu changes under us.*/
int local_using_sysemu;
+ siginfo_t si;
if (getitimer(ITIMER_VIRTUAL, &timer))
printk(UM_KERN_ERR "Failed to get itimer, errno = %d\n", errno);
@@ -404,13 +405,17 @@ void userspace(struct uml_pt_regs *regs)
if (WIFSTOPPED(status)) {
int sig = WSTOPSIG(status);
+
+ ptrace(PTRACE_GETSIGINFO, pid, 0, &si);
+
switch (sig) {
case SIGSEGV:
if (PTRACE_FULL_FAULTINFO ||
!ptrace_faultinfo) {
get_skas_faultinfo(pid,
®s->faultinfo);
- (*sig_info[SIGSEGV])(SIGSEGV, regs);
+ (*sig_info[SIGSEGV])(SIGSEGV, &si,
+ regs);
}
else handle_segv(pid, regs);
break;
@@ -418,14 +423,14 @@ void userspace(struct uml_pt_regs *regs)
handle_trap(pid, regs, local_using_sysemu);
break;
case SIGTRAP:
- relay_signal(SIGTRAP, regs);
+ relay_signal(SIGTRAP, &si, regs);
break;
case SIGVTALRM:
now = os_nsecs();
if (now < nsecs)
break;
block_signals();
- (*sig_info[sig])(sig, regs);
+ (*sig_info[sig])(sig, &si, regs);
unblock_signals();
nsecs = timer.it_value.tv_sec *
UM_NSEC_PER_SEC +
@@ -439,7 +444,7 @@ void userspace(struct uml_pt_regs *regs)
case SIGFPE:
case SIGWINCH:
block_signals();
- (*sig_info[sig])(sig, regs);
+ (*sig_info[sig])(sig, &si, regs);
unblock_signals();
break;
default:
diff -uprN -X linux-3.4.1/Documentation/dontdiff -x config.c -x config.tmp
linux-3.4.1/arch/um/os-Linux/time.c linux-3.4.1-mod/arch/um/os-Linux/time.c
--- linux-3.4.1/arch/um/os-Linux/time.c 2012-06-01 10:18:44.000000000 +0300
+++ linux-3.4.1-mod/arch/um/os-Linux/time.c 2012-06-21 10:33:21.748320666
+0300
@@ -87,7 +87,7 @@ static int after_sleep_interval(struct t
static void deliver_alarm(void)
{
- alarm_handler(SIGVTALRM, NULL);
+ alarm_handler(SIGVTALRM, NULL, NULL);
}
static unsigned long long sleep_time(unsigned long long nsecs)
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