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Diffstat (limited to 'arch/x86/kernel/signal_64.c')
-rw-r--r--arch/x86/kernel/signal_64.c139
1 files changed, 79 insertions, 60 deletions
diff --git a/arch/x86/kernel/signal_64.c b/arch/x86/kernel/signal_64.c
index 823a55bf8c3..bf77d4789a2 100644
--- a/arch/x86/kernel/signal_64.c
+++ b/arch/x86/kernel/signal_64.c
@@ -94,7 +94,8 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
}
{
- struct _fpstate __user *buf;
+ void __user *buf;
+
err |= __get_user(buf, &sc->fpstate);
err |= restore_i387_xstate(buf);
}
@@ -103,11 +104,11 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
return err;
}
-asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
+static long do_rt_sigreturn(struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
- sigset_t set;
unsigned long ax;
+ sigset_t set;
frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
@@ -130,10 +131,15 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
return ax;
badframe:
- signal_fault(regs, frame, "sigreturn");
+ signal_fault(regs, frame, "rt_sigreturn");
return 0;
}
+asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
+{
+ return do_rt_sigreturn(regs);
+}
+
/*
* Set up a signal frame.
*/
@@ -195,8 +201,8 @@ get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
return (void __user *)round_down(sp - size, 64);
}
-static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
+static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
void __user *fp = NULL;
@@ -209,17 +215,16 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
(unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
if (save_i387_xstate(fp) < 0)
- err |= -1;
+ return -EFAULT;
} else
frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8;
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;
if (ka->sa.sa_flags & SA_SIGINFO) {
- err |= copy_siginfo_to_user(&frame->info, info);
- if (err)
- goto give_sigsegv;
+ if (copy_siginfo_to_user(&frame->info, info))
+ return -EFAULT;
}
/* Create the ucontext. */
@@ -247,11 +252,11 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
} else {
/* could use a vstub here */
- goto give_sigsegv;
+ return -EFAULT;
}
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Set up registers for signal handler */
regs->di = sig;
@@ -271,15 +276,34 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
regs->cs = __USER_CS;
return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}
/*
* OK, we're invoking a handler
*/
+static int
+setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
+{
+ int ret;
+
+#ifdef CONFIG_IA32_EMULATION
+ if (test_thread_flag(TIF_IA32)) {
+ if (ka->sa.sa_flags & SA_SIGINFO)
+ ret = ia32_setup_rt_frame(sig, ka, info, set, regs);
+ else
+ ret = ia32_setup_frame(sig, ka, set, regs);
+ } else
+#endif
+ ret = __setup_rt_frame(sig, ka, info, set, regs);
+
+ if (ret) {
+ force_sigsegv(sig, current);
+ return -EFAULT;
+ }
+
+ return ret;
+}
static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
@@ -317,51 +341,46 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
regs->flags &= ~X86_EFLAGS_TF;
-#ifdef CONFIG_IA32_EMULATION
- if (test_thread_flag(TIF_IA32)) {
- if (ka->sa.sa_flags & SA_SIGINFO)
- ret = ia32_setup_rt_frame(sig, ka, info, oldset, regs);
- else
- ret = ia32_setup_frame(sig, ka, oldset, regs);
- } else
-#endif
ret = setup_rt_frame(sig, ka, info, oldset, regs);
- if (ret == 0) {
- /*
- * This has nothing to do with segment registers,
- * despite the name. This magic affects uaccess.h
- * macros' behavior. Reset it to the normal setting.
- */
- set_fs(USER_DS);
+ if (ret)
+ return ret;
- /*
- * Clear the direction flag as per the ABI for function entry.
- */
- regs->flags &= ~X86_EFLAGS_DF;
+ /*
+ * This has nothing to do with segment registers,
+ * despite the name. This magic affects uaccess.h
+ * macros' behavior. Reset it to the normal setting.
+ */
+ set_fs(USER_DS);
- /*
- * Clear TF when entering the signal handler, but
- * notify any tracer that was single-stepping it.
- * The tracer may want to single-step inside the
- * handler too.
- */
- regs->flags &= ~X86_EFLAGS_TF;
+ /*
+ * Clear the direction flag as per the ABI for function entry.
+ */
+ regs->flags &= ~X86_EFLAGS_DF;
- spin_lock_irq(&current->sighand->siglock);
- sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
- if (!(ka->sa.sa_flags & SA_NODEFER))
- sigaddset(&current->blocked, sig);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
+ /*
+ * Clear TF when entering the signal handler, but
+ * notify any tracer that was single-stepping it.
+ * The tracer may want to single-step inside the
+ * handler too.
+ */
+ regs->flags &= ~X86_EFLAGS_TF;
- tracehook_signal_handler(sig, info, ka, regs,
- test_thread_flag(TIF_SINGLESTEP));
- }
+ spin_lock_irq(&current->sighand->siglock);
+ sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
+ if (!(ka->sa.sa_flags & SA_NODEFER))
+ sigaddset(&current->blocked, sig);
+ recalc_sigpending();
+ spin_unlock_irq(&current->sighand->siglock);
- return ret;
+ tracehook_signal_handler(sig, info, ka, regs,
+ test_thread_flag(TIF_SINGLESTEP));
+
+ return 0;
}
+#define NR_restart_syscall \
+ test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
@@ -423,9 +442,7 @@ static void do_signal(struct pt_regs *regs)
regs->ip -= 2;
break;
case -ERESTART_RESTARTBLOCK:
- regs->ax = test_thread_flag(TIF_IA32) ?
- __NR_ia32_restart_syscall :
- __NR_restart_syscall;
+ regs->ax = NR_restart_syscall;
regs->ip -= 2;
break;
}
@@ -463,12 +480,14 @@ void do_notify_resume(struct pt_regs *regs, void *unused,
void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
{
struct task_struct *me = current;
+
if (show_unhandled_signals && printk_ratelimit()) {
- printk("%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
- me->comm, me->pid, where, frame, regs->ip,
- regs->sp, regs->orig_ax);
+ printk(KERN_INFO
+ "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
+ me->comm, me->pid, where, frame,
+ regs->ip, regs->sp, regs->orig_ax);
print_vma_addr(" in ", regs->ip);
- printk("\n");
+ printk(KERN_CONT "\n");
}
force_sig(SIGSEGV, me);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-04-14 16:01:05 +0000