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Commit 495dfbf7 authored by Al Viro's avatar Al Viro
Browse files

generic sys_sigaction() and compat_sys_sigaction() 



conditional on OLD_SIGACTION/COMPAT_OLD_SIGACTION

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 08d32fe5

arch/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -400,4 +400,15 @@ config OLD_SIGSUSPEND3 
	help

	  Even weirder antique ABI - three-argument sigsuspend(2)



config OLD_SIGACTION

	bool

	help

	  Architecture has old sigaction(2) syscall.  Nope, not the same

	  as OLD_SIGSUSPEND | OLD_SIGSUSPEND3 - alpha has sigsuspend(2),

	  but fairly different variant of sigaction(2), thanks to OSF/1

	  compatibility...



config COMPAT_OLD_SIGACTION

	bool



source "kernel/gcov/Kconfig"

include/linux/compat.h

+14 −0
Original line number Diff line number Diff line
@@ -299,6 +299,15 @@ struct compat_robust_list_head { 
	compat_uptr_t			list_op_pending;

};



#ifdef CONFIG_COMPAT_OLD_SIGACTION

struct compat_old_sigaction {

	compat_uptr_t			sa_handler;

	compat_old_sigset_t		sa_mask;

	compat_ulong_t			sa_flags;

	compat_uptr_t			sa_restorer;

};

#endif



struct compat_statfs;

struct compat_statfs64;

struct compat_old_linux_dirent;
@@ -383,6 +392,11 @@ int get_compat_sigevent(struct sigevent *event, 
		const struct compat_sigevent __user *u_event);

long compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,

				  struct compat_siginfo __user *uinfo);

#ifdef CONFIG_COMPAT_OLD_SIGACTION

asmlinkage long compat_sys_sigaction(int sig,

                                   const struct compat_old_sigaction __user *act,

                                   struct compat_old_sigaction __user *oact);

#endif



static inline int compat_timeval_compare(struct compat_timeval *lhs,

					struct compat_timeval *rhs)

include/linux/signal.h

+9 −0
Original line number Diff line number Diff line
@@ -270,6 +270,15 @@ struct k_sigaction { 
#endif

};

 

#ifdef CONFIG_OLD_SIGACTION

struct old_sigaction {

	__sighandler_t sa_handler;

	old_sigset_t sa_mask;

	unsigned long sa_flags;

	__sigrestore_t sa_restorer;

};

#endif



extern int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie);

extern void signal_delivered(int sig, siginfo_t *info, struct k_sigaction *ka, struct pt_regs *regs, int stepping);

extern void exit_signals(struct task_struct *tsk);

include/linux/syscalls.h

+5 −0
Original line number Diff line number Diff line
@@ -385,6 +385,11 @@ asmlinkage long sys_sigsuspend(old_sigset_t mask); 
asmlinkage long sys_sigsuspend(int unused1, int unused2, old_sigset_t mask);

#endif



#ifdef CONFIG_OLD_SIGACTION

asmlinkage long sys_sigaction(int, const struct old_sigaction __user *,

				struct old_sigaction __user *);

#endif



#ifndef CONFIG_ODD_RT_SIGACTION

asmlinkage long sys_rt_sigaction(int,

				 const struct sigaction __user *,

kernel/signal.c

+78 −0
Original line number Diff line number Diff line
@@ -3409,6 +3409,84 @@ COMPAT_SYSCALL_DEFINE4(rt_sigaction, int, sig, 
#endif

#endif /* !CONFIG_ODD_RT_SIGACTION */



#ifdef CONFIG_OLD_SIGACTION

SYSCALL_DEFINE3(sigaction, int, sig,

		const struct old_sigaction __user *, act,

	        struct old_sigaction __user *, oact)

{

	struct k_sigaction new_ka, old_ka;

	int ret;



	if (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_flags, &act->sa_flags) ||

		    __get_user(mask, &act->sa_mask))

			return -EFAULT;

#ifdef __ARCH_HAS_KA_RESTORER

		new_ka.ka_restorer = NULL;

#endif

		siginitset(&new_ka.sa.sa_mask, mask);

	}



	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);



	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_flags, &oact->sa_flags) ||

		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))

			return -EFAULT;

	}



	return ret;

}

#endif

#ifdef CONFIG_COMPAT_OLD_SIGACTION

COMPAT_SYSCALL_DEFINE3(sigaction, int, sig,

		const struct compat_old_sigaction __user *, act,

	        struct compat_old_sigaction __user *, oact)

{

	struct k_sigaction new_ka, old_ka;

	int ret;

	compat_old_sigset_t mask;

	compat_uptr_t handler, restorer;



	if (act) {

		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||

		    __get_user(handler, &act->sa_handler) ||

		    __get_user(restorer, &act->sa_restorer) ||

		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||

		    __get_user(mask, &act->sa_mask))

			return -EFAULT;



#ifdef __ARCH_HAS_KA_RESTORER

		new_ka.ka_restorer = NULL;

#endif

		new_ka.sa.sa_handler = compat_ptr(handler);

		new_ka.sa.sa_restorer = compat_ptr(restorer);

		siginitset(&new_ka.sa.sa_mask, mask);

	}



	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);



	if (!ret && oact) {

		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||

		    __put_user(ptr_to_compat(old_ka.sa.sa_handler),

			       &oact->sa_handler) ||

		    __put_user(ptr_to_compat(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;

	}

	return ret;

}

#endif



#ifdef __ARCH_WANT_SYS_SGETMASK



/*