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Diffstat (limited to 'arch/sh/kernel/signal_32.c')
-rw-r--r--arch/sh/kernel/signal_32.c98
1 files changed, 32 insertions, 66 deletions
diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index 5901fba3176e..d6b7b6154f87 100644
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -32,8 +32,6 @@
#include <asm/syscalls.h>
#include <asm/fpu.h>
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
struct fdpic_func_descriptor {
unsigned long text;
unsigned long GOT;
@@ -53,23 +51,11 @@ struct fdpic_func_descriptor {
* Atomically swap in the new signal mask, and wait for a signal.
*/
asmlinkage int
-sys_sigsuspend(old_sigset_t mask,
- unsigned long r5, unsigned long r6, unsigned long r7,
- struct pt_regs __regs)
+sys_sigsuspend(old_sigset_t mask)
{
sigset_t blocked;
-
- current->saved_sigmask = current->blocked;
-
- mask &= _BLOCKABLE;
siginitset(&blocked, mask);
- set_current_blocked(&blocked);
-
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- set_restore_sigmask();
-
- return -ERESTARTNOHAND;
+ return sigsuspend(&blocked);
}
asmlinkage int
@@ -83,10 +69,10 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
old_sigset_t mask;
if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
- __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+ __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
+ __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
+ __get_user(mask, &act->sa_mask))
return -EFAULT;
- __get_user(new_ka.sa.sa_flags, &act->sa_flags);
- __get_user(mask, &act->sa_mask);
siginitset(&new_ka.sa.sa_mask, mask);
}
@@ -95,10 +81,10 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
if (!ret && oact) {
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
- __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+ __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
+ __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
+ __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
return -EFAULT;
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
}
return ret;
@@ -162,12 +148,11 @@ static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
if (!(boot_cpu_data.flags & CPU_HAS_FPU))
return 0;
- if (!used_math()) {
- __put_user(0, &sc->sc_ownedfp);
- return 0;
- }
+ if (!used_math())
+ return __put_user(0, &sc->sc_ownedfp);
- __put_user(1, &sc->sc_ownedfp);
+ if (__put_user(1, &sc->sc_ownedfp))
+ return -EFAULT;
/* This will cause a "finit" to be triggered by the next
attempted FPU operation by the 'current' process.
@@ -207,7 +192,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p
regs->sr |= SR_FD; /* Release FPU */
clear_fpu(tsk, regs);
clear_used_math();
- __get_user (owned_fp, &sc->sc_ownedfp);
+ err |= __get_user (owned_fp, &sc->sc_ownedfp);
if (owned_fp)
err |= restore_sigcontext_fpu(sc);
}
@@ -239,7 +224,6 @@ asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
sizeof(frame->extramask))))
goto badframe;
- sigdelsetmask(&set, ~_BLOCKABLE);
set_current_blocked(&set);
if (restore_sigcontext(regs, &frame->sc, &r0))
@@ -269,7 +253,6 @@ asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
goto badframe;
- sigdelsetmask(&set, ~_BLOCKABLE);
set_current_blocked(&set);
if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
@@ -398,11 +381,14 @@ static int setup_frame(int sig, struct k_sigaction *ka,
struct fdpic_func_descriptor __user *funcptr =
(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
- __get_user(regs->pc, &funcptr->text);
- __get_user(regs->regs[12], &funcptr->GOT);
+ err |= __get_user(regs->pc, &funcptr->text);
+ err |= __get_user(regs->regs[12], &funcptr->GOT);
} else
regs->pc = (unsigned long)ka->sa.sa_handler;
+ if (err)
+ goto give_sigsegv;
+
set_fs(USER_DS);
pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
@@ -482,11 +468,14 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
struct fdpic_func_descriptor __user *funcptr =
(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
- __get_user(regs->pc, &funcptr->text);
- __get_user(regs->regs[12], &funcptr->GOT);
+ err |= __get_user(regs->pc, &funcptr->text);
+ err |= __get_user(regs->regs[12], &funcptr->GOT);
} else
regs->pc = (unsigned long)ka->sa.sa_handler;
+ if (err)
+ goto give_sigsegv;
+
set_fs(USER_DS);
pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
@@ -529,10 +518,11 @@ handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs,
/*
* OK, we're invoking a handler
*/
-static int
+static void
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0)
+ struct pt_regs *regs, unsigned int save_r0)
{
+ sigset_t *oldset = sigmask_to_save();
int ret;
/* Set up the stack frame */
@@ -541,10 +531,10 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
else
ret = setup_frame(sig, ka, oldset, regs);
- if (ret == 0)
- block_sigmask(ka, sig);
-
- return ret;
+ if (ret)
+ return;
+ signal_delivered(sig, info, ka, regs,
+ test_thread_flag(TIF_SINGLESTEP));
}
/*
@@ -561,7 +551,6 @@ static void do_signal(struct pt_regs *regs, unsigned int save_r0)
siginfo_t info;
int signr;
struct k_sigaction ka;
- sigset_t *oldset;
/*
* We want the common case to go fast, which
@@ -572,30 +561,12 @@ static void do_signal(struct pt_regs *regs, unsigned int save_r0)
if (!user_mode(regs))
return;
- if (current_thread_info()->status & TS_RESTORE_SIGMASK)
- oldset = &current->saved_sigmask;
- else
- oldset = &current->blocked;
-
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
handle_syscall_restart(save_r0, regs, &ka.sa);
/* Whee! Actually deliver the signal. */
- if (handle_signal(signr, &ka, &info, oldset,
- regs, save_r0) == 0) {
- /*
- * A signal was successfully delivered; the saved
- * sigmask will have been stored in the signal frame,
- * and will be restored by sigreturn, so we can simply
- * clear the TS_RESTORE_SIGMASK flag
- */
- current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
-
- tracehook_signal_handler(signr, &info, &ka, regs,
- test_thread_flag(TIF_SINGLESTEP));
- }
-
+ handle_signal(signr, &ka, &info, regs, save_r0);
return;
}
@@ -617,10 +588,7 @@ static void do_signal(struct pt_regs *regs, unsigned int save_r0)
* If there's no signal to deliver, we just put the saved sigmask
* back.
*/
- if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
- current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
- sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
- }
+ restore_saved_sigmask();
}
asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
@@ -633,7 +601,5 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
if (thread_info_flags & _TIF_NOTIFY_RESUME) {
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(regs);
- if (current->replacement_session_keyring)
- key_replace_session_keyring();
}
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.