From 68f3f16d9ad0f1e28ab3fd0001ab5798c41f15a3 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 21 May 2012 21:42:32 -0400 Subject: new helper: sigsuspend() guts of saved_sigmask-based sigsuspend/rt_sigsuspend. Takes kernel sigset_t *. Open-coded instances replaced with calling it. Signed-off-by: Al Viro --- arch/sh/kernel/signal_32.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) (limited to 'arch/sh') diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c index 5901fba..46c9f9b 100644 --- a/arch/sh/kernel/signal_32.c +++ b/arch/sh/kernel/signal_32.c @@ -58,18 +58,8 @@ sys_sigsuspend(old_sigset_t mask, struct pt_regs __regs) { 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 -- cgit v1.1 From 9ef461adf9875a0fcaafe4d152a7557740fa1a25 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 22 Apr 2012 01:16:34 -0400 Subject: sh: switch to saved_sigmask-based sigsuspend()/rt_sigsuspend() Complete the move of sh64 to it, trim the crap from prototypes, tidy up a bit. Infrastructure in do_signal() had already been there, in signal_64 as well as in signal_32 (where it was already used). Signed-off-by: Al Viro --- arch/sh/include/asm/syscalls_32.h | 4 +-- arch/sh/include/asm/unistd.h | 4 +-- arch/sh/kernel/signal_32.c | 4 +-- arch/sh/kernel/signal_64.c | 72 ++++++--------------------------------- 4 files changed, 13 insertions(+), 71 deletions(-) (limited to 'arch/sh') diff --git a/arch/sh/include/asm/syscalls_32.h b/arch/sh/include/asm/syscalls_32.h index ae717e3..6c1fa55 100644 --- a/arch/sh/include/asm/syscalls_32.h +++ b/arch/sh/include/asm/syscalls_32.h @@ -23,9 +23,7 @@ asmlinkage int sys_execve(const char __user *ufilename, const char __user *const __user *uargv, const char __user *const __user *uenvp, unsigned long r7, struct pt_regs __regs); -asmlinkage int sys_sigsuspend(old_sigset_t mask, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs __regs); +asmlinkage int sys_sigsuspend(old_sigset_t mask); asmlinkage int sys_sigaction(int sig, const struct old_sigaction __user *act, struct old_sigaction __user *oact); asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, diff --git a/arch/sh/include/asm/unistd.h b/arch/sh/include/asm/unistd.h index a42a561..e800a38 100644 --- a/arch/sh/include/asm/unistd.h +++ b/arch/sh/include/asm/unistd.h @@ -1,13 +1,11 @@ #ifdef __KERNEL__ # ifdef CONFIG_SUPERH32 - # include "unistd_32.h" -# define __ARCH_WANT_SYS_RT_SIGSUSPEND - # else # include "unistd_64.h" # endif +# define __ARCH_WANT_SYS_RT_SIGSUSPEND # define __ARCH_WANT_IPC_PARSE_VERSION # define __ARCH_WANT_OLD_READDIR # define __ARCH_WANT_OLD_STAT diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c index 46c9f9b..04d776f 100644 --- a/arch/sh/kernel/signal_32.c +++ b/arch/sh/kernel/signal_32.c @@ -53,9 +53,7 @@ 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; siginitset(&blocked, mask); diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c index 3c9a6f7..8f6ed23 100644 --- a/arch/sh/kernel/signal_64.c +++ b/arch/sh/kernel/signal_64.c @@ -83,11 +83,12 @@ handle_syscall_restart(struct pt_regs *regs, struct sigaction *sa) * the kernel can handle, and then we build all the user-level signal handling * stack-frames in one go after that. */ -static int do_signal(struct pt_regs *regs, sigset_t *oldset) +static void do_signal(struct pt_regs *regs) { siginfo_t info; int signr; struct k_sigaction ka; + sigset_t *oldset; /* * We want the common case to go fast, which @@ -96,11 +97,11 @@ static int do_signal(struct pt_regs *regs, sigset_t *oldset) * if so. */ if (!user_mode(regs)) - return 1; + return; if (current_thread_info()->status & TS_RESTORE_SIGMASK) oldset = ¤t->saved_sigmask; - else if (!oldset) + else oldset = ¤t->blocked; signr = get_signal_to_deliver(&info, &ka, regs, 0); @@ -118,7 +119,7 @@ static int do_signal(struct pt_regs *regs, sigset_t *oldset) tracehook_signal_handler(signr, &info, &ka, regs, test_thread_flag(TIF_SINGLESTEP)); - return 1; + return; } } @@ -147,71 +148,18 @@ static int do_signal(struct pt_regs *regs, sigset_t *oldset) sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); } - return 0; + return; } /* * Atomically swap in the new signal mask, and wait for a signal. */ asmlinkage int -sys_sigsuspend(old_sigset_t mask, - unsigned long r3, unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs * regs) +sys_sigsuspend(old_sigset_t mask) { - sigset_t saveset, blocked; - - saveset = current->blocked; - - mask &= _BLOCKABLE; + sigset_t blocked; siginitset(&blocked, mask); - set_current_blocked(&blocked); - - REF_REG_RET = -EINTR; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - set_restore_sigmask(); - regs->pc += 4; /* because sys_sigreturn decrements the pc */ - if (do_signal(regs, &saveset)) { - /* pc now points at signal handler. Need to decrement - it because entry.S will increment it. */ - regs->pc -= 4; - return -EINTR; - } - } -} - -asmlinkage int -sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, - unsigned long r4, unsigned long r5, unsigned long r6, - unsigned long r7, - struct pt_regs * regs) -{ - sigset_t saveset, newset; - - /* XXX: Don't preclude handling different sized sigset_t's. */ - if (sigsetsize != sizeof(sigset_t)) - return -EINVAL; - - if (copy_from_user(&newset, unewset, sizeof(newset))) - return -EFAULT; - sigdelsetmask(&newset, ~_BLOCKABLE); - saveset = current->blocked; - set_current_blocked(&newset); - - REF_REG_RET = -EINTR; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - regs->pc += 4; /* because sys_sigreturn decrements the pc */ - if (do_signal(regs, &saveset)) { - /* pc now points at signal handler. Need to decrement - it because entry.S will increment it. */ - regs->pc -= 4; - return -EINTR; - } - } + return sigsuspend(&blocked); } asmlinkage int @@ -732,7 +680,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) { if (thread_info_flags & _TIF_SIGPENDING) - do_signal(regs, 0); + do_signal(regs); if (thread_info_flags & _TIF_NOTIFY_RESUME) { clear_thread_flag(TIF_NOTIFY_RESUME); -- cgit v1.1 From a46808e1b75216f175a12cd16e3af3be2d4a53d4 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 22 Apr 2012 16:59:56 -0400 Subject: sh: missing checks of __get_user()/__put_user() return values Signed-off-by: Al Viro --- arch/sh/kernel/signal_32.c | 37 +++++++++++++++++++++---------------- arch/sh/kernel/signal_64.c | 12 ++++++------ 2 files changed, 27 insertions(+), 22 deletions(-) (limited to 'arch/sh') diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c index 04d776f..cb4172c 100644 --- a/arch/sh/kernel/signal_32.c +++ b/arch/sh/kernel/signal_32.c @@ -71,10 +71,10 @@ 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); } @@ -83,10 +83,10 @@ 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; @@ -150,12 +150,11 @@ 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. @@ -195,7 +194,7 @@ 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); } @@ -386,11 +385,14 @@ 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", @@ -470,11 +472,14 @@ 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", diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c index 8f6ed23..b589a35 100644 --- a/arch/sh/kernel/signal_64.c +++ b/arch/sh/kernel/signal_64.c @@ -173,10 +173,10 @@ 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); } @@ -185,10 +185,10 @@ 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; -- cgit v1.1