Contributors: 11
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jeff Dike |
348 |
73.57% |
16 |
48.48% |
| Johannes Berg |
57 |
12.05% |
1 |
3.03% |
| Richard Weinberger |
26 |
5.50% |
3 |
9.09% |
| Al Viro |
26 |
5.50% |
6 |
18.18% |
| Eric W. Biedermann |
4 |
0.85% |
1 |
3.03% |
| Ingo Molnar |
2 |
0.42% |
1 |
3.03% |
| Gustavo A. R. Silva |
2 |
0.42% |
1 |
3.03% |
| Paolo 'Blaisorblade' Giarrusso |
2 |
0.42% |
1 |
3.03% |
| Daniel Jacobowitz |
2 |
0.42% |
1 |
3.03% |
| Alex Dewar |
2 |
0.42% |
1 |
3.03% |
| Gennady Sharapov |
2 |
0.42% |
1 |
3.03% |
| Total |
473 |
|
33 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
*/
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/ftrace.h>
#include <asm/siginfo.h>
#include <asm/signal.h>
#include <asm/unistd.h>
#include <frame_kern.h>
#include <kern_util.h>
#include <os.h>
EXPORT_SYMBOL(block_signals);
EXPORT_SYMBOL(unblock_signals);
void block_signals_trace(void)
{
block_signals();
if (current_thread_info())
trace_hardirqs_off();
}
void unblock_signals_trace(void)
{
if (current_thread_info())
trace_hardirqs_on();
unblock_signals();
}
void um_trace_signals_on(void)
{
if (current_thread_info())
trace_hardirqs_on();
}
void um_trace_signals_off(void)
{
if (current_thread_info())
trace_hardirqs_off();
}
/*
* OK, we're invoking a handler
*/
static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
sigset_t *oldset = sigmask_to_save();
int singlestep = 0;
unsigned long sp;
int err;
if (test_thread_flag(TIF_SINGLESTEP) && (current->ptrace & PT_PTRACED))
singlestep = 1;
/* Did we come from a system call? */
if (PT_REGS_SYSCALL_NR(regs) >= 0) {
/* If so, check system call restarting.. */
switch (PT_REGS_SYSCALL_RET(regs)) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
PT_REGS_SYSCALL_RET(regs) = -EINTR;
break;
case -ERESTARTSYS:
if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
PT_REGS_SYSCALL_RET(regs) = -EINTR;
break;
}
fallthrough;
case -ERESTARTNOINTR:
PT_REGS_RESTART_SYSCALL(regs);
PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
break;
}
}
sp = PT_REGS_SP(regs);
if ((ksig->ka.sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
sp = current->sas_ss_sp + current->sas_ss_size;
#ifdef CONFIG_ARCH_HAS_SC_SIGNALS
if (!(ksig->ka.sa.sa_flags & SA_SIGINFO))
err = setup_signal_stack_sc(sp, ksig, regs, oldset);
else
#endif
err = setup_signal_stack_si(sp, ksig, regs, oldset);
signal_setup_done(err, ksig, singlestep);
}
void do_signal(struct pt_regs *regs)
{
struct ksignal ksig;
int handled_sig = 0;
while (get_signal(&ksig)) {
handled_sig = 1;
/* Whee! Actually deliver the signal. */
handle_signal(&ksig, regs);
}
/* Did we come from a system call? */
if (!handled_sig && (PT_REGS_SYSCALL_NR(regs) >= 0)) {
/* Restart the system call - no handlers present */
switch (PT_REGS_SYSCALL_RET(regs)) {
case -ERESTARTNOHAND:
case -ERESTARTSYS:
case -ERESTARTNOINTR:
PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
PT_REGS_RESTART_SYSCALL(regs);
break;
case -ERESTART_RESTARTBLOCK:
PT_REGS_ORIG_SYSCALL(regs) = __NR_restart_syscall;
PT_REGS_RESTART_SYSCALL(regs);
break;
}
}
/*
* if there's no signal to deliver, we just put the saved sigmask
* back
*/
if (!handled_sig)
restore_saved_sigmask();
}