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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

Browse source 
Pull signal handling cleanups from Al Viro:
 "This is the first pile; another one will come a bit later and will
  contain SYSCALL_DEFINE-related patches.

   - a bunch of signal-related syscalls (both native and compat)
     unified.

   - a bunch of compat syscalls switched to COMPAT_SYSCALL_DEFINE
     (fixing several potential problems with missing argument
     validation, while we are at it)

   - a lot of now-pointless wrappers killed

   - a couple of architectures (cris and hexagon) forgot to save
     altstack settings into sigframe, even though they used the
     (uninitialized) values in sigreturn; fixed.

   - microblaze fixes for delivery of multiple signals arriving at once

   - saner set of helpers for signal delivery introduced, several
     architectures switched to using those."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (143 commits)
  x86: convert to ksignal
  sparc: convert to ksignal
  arm: switch to struct ksignal * passing
  alpha: pass k_sigaction and siginfo_t using ksignal pointer
  burying unused conditionals
  make do_sigaltstack() static
  arm64: switch to generic old sigaction() (compat-only)
  arm64: switch to generic compat rt_sigaction()
  arm64: switch compat to generic old sigsuspend
  arm64: switch to generic compat rt_sigqueueinfo()
  arm64: switch to generic compat rt_sigpending()
  arm64: switch to generic compat rt_sigprocmask()
  arm64: switch to generic sigaltstack
  sparc: switch to generic old sigsuspend
  sparc: COMPAT_SYSCALL_DEFINE does all sign-extension as well as SYSCALL_DEFINE
  sparc: kill sign-extending wrappers for native syscalls
  kill sparc32_open()
  sparc: switch to use of generic old sigaction
  sparc: switch sys_compat_rt_sigaction() to COMPAT_SYSCALL_DEFINE
  mips: switch to generic sys_fork() and sys_clone()
  ...
This commit is contained in:
Linus Torvalds 2013-02-23 18:50:11 -08:00
commit 9e2d59ad58
185 changed files with 1363 additions and 4825 deletions
Download patch file Download diff file Expand all files Collapse all files

3
arch/alpha/Kconfig
View file

@ -21,7 +21,8 @@ config ALPHA
select GENERIC_STRNLEN_USER
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select GENERIC_SIGALTSTACK
select ODD_RT_SIGACTION
select OLD_SIGSUSPEND
help
The Alpha is a 64-bit general-purpose processor designed and
marketed by the Digital Equipment Corporation of blessed memory,

11
arch/alpha/include/asm/signal.h
View file

@ -22,15 +22,6 @@ struct osf_sigaction {
int sa_flags;
};
struct sigaction {
__sighandler_t sa_handler;
unsigned long sa_flags;
sigset_t sa_mask; /* mask last for extensibility */
};
struct k_sigaction {
struct sigaction sa;
__sigrestore_t ka_restorer;
};
#define __ARCH_HAS_KA_RESTORER
#include <asm/sigcontext.h>
#endif

1
arch/alpha/include/asm/unistd.h
View file

@ -14,7 +14,6 @@
#define __ARCH_WANT_SYS_OLD_GETRLIMIT
#define __ARCH_WANT_SYS_OLDUMOUNT
#define __ARCH_WANT_SYS_SIGPENDING
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_VFORK
#define __ARCH_WANT_SYS_CLONE

1
arch/alpha/kernel/process.c
View file

@ -250,7 +250,6 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
struct pt_regs *childregs = task_pt_regs(p);
struct pt_regs *regs = current_pt_regs();
struct switch_stack *childstack, *stack;
unsigned long settls;
childstack = ((struct switch_stack *) childregs) - 1;
childti->pcb.ksp = (unsigned long) childstack;

121
arch/alpha/kernel/signal.c
View file

@ -112,16 +112,6 @@ SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
return ret;
}
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
SYSCALL_DEFINE1(sigsuspend, old_sigset_t, mask)
{
sigset_t blocked;
siginitset(&blocked, mask);
return sigsuspend(&blocked);
}
/*
* Do a signal return; undo the signal stack.
*/
@ -282,12 +272,9 @@ give_sigsegv:
*/
static inline void __user *
get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
get_sigframe(struct ksignal *ksig, unsigned long sp, size_t frame_size)
{
if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
sp = current->sas_ss_sp + current->sas_ss_size;
return (void __user *)((sp - frame_size) & -32ul);
return (void __user *)((sigsp(sp, ksig) - frame_size) & -32ul);
}
static long
@ -348,14 +335,13 @@ setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
}
static int
setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
struct pt_regs *regs)
setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
{
unsigned long oldsp, r26, err = 0;
struct sigframe __user *frame;
oldsp = rdusp();
frame = get_sigframe(ka, oldsp, sizeof(*frame));
frame = get_sigframe(ksig, oldsp, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;
@ -365,9 +351,8 @@ setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->ka_restorer) {
r26 = (unsigned long) ka->ka_restorer;
} else {
r26 = (unsigned long) ksig->ka.ka_restorer;
if (!r26) {
err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
err |= __put_user(INSN_LDI_R0+__NR_sigreturn, frame->retcode+1);
err |= __put_user(INSN_CALLSYS, frame->retcode+2);
@ -381,8 +366,8 @@ setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
/* "Return" to the handler */
regs->r26 = r26;
regs->r27 = regs->pc = (unsigned long) ka->sa.sa_handler;
regs->r16 = sig; /* a0: signal number */
regs->r27 = regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
regs->r16 = ksig->sig; /* a0: signal number */
regs->r17 = 0; /* a1: exception code */
regs->r18 = (unsigned long) &frame->sc; /* a2: sigcontext pointer */
wrusp((unsigned long) frame);
@ -395,18 +380,17 @@ setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
}
static int
setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
{
unsigned long oldsp, r26, err = 0;
struct rt_sigframe __user *frame;
oldsp = rdusp();
frame = get_sigframe(ka, oldsp, sizeof(*frame));
frame = get_sigframe(ksig, oldsp, sizeof(*frame));
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;
err |= copy_siginfo_to_user(&frame->info, info);
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
@ -421,9 +405,8 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->ka_restorer) {
r26 = (unsigned long) ka->ka_restorer;
} else {
r26 = (unsigned long) ksig->ka.ka_restorer;
if (!r26) {
err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
err |= __put_user(INSN_LDI_R0+__NR_rt_sigreturn,
frame->retcode+1);
@ -437,8 +420,8 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
/* "Return" to the handler */
regs->r26 = r26;
regs->r27 = regs->pc = (unsigned long) ka->sa.sa_handler;
regs->r16 = sig; /* a0: signal number */
regs->r27 = regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
regs->r16 = ksig->sig; /* a0: signal number */
regs->r17 = (unsigned long) &frame->info; /* a1: siginfo pointer */
regs->r18 = (unsigned long) &frame->uc; /* a2: ucontext pointer */
wrusp((unsigned long) frame);
@ -456,22 +439,17 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
* OK, we're invoking a handler.
*/
static inline void
handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
struct pt_regs * regs)
handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
sigset_t *oldset = sigmask_to_save();
int ret;
if (ka->sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(sig, ka, info, oldset, regs);
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(ksig, oldset, regs);
else
ret = setup_frame(sig, ka, oldset, regs);
ret = setup_frame(ksig, oldset, regs);
if (ret) {
force_sigsegv(sig, current);
return;
}
signal_delivered(sig, info, ka, regs, 0);
signal_setup_done(ret, ksig, 0);
}
static inline void
@ -514,47 +492,38 @@ syscall_restart(unsigned long r0, unsigned long r19,
static void
do_signal(struct pt_regs *regs, unsigned long r0, unsigned long r19)
{
siginfo_t info;
int signr;
unsigned long single_stepping = ptrace_cancel_bpt(current);
struct k_sigaction ka;
struct ksignal ksig;
/* This lets the debugger run, ... */
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
/* ... so re-check the single stepping. */
single_stepping |= ptrace_cancel_bpt(current);
if (signr > 0) {
if (get_signal(&ksig)) {
/* ... so re-check the single stepping. */
single_stepping |= ptrace_cancel_bpt(current);
/* Whee! Actually deliver the signal. */
if (r0)
syscall_restart(r0, r19, regs, &ka);
handle_signal(signr, &ka, &info, regs);
if (single_stepping)
ptrace_set_bpt(current); /* re-set bpt */
return;
}
if (r0) {
switch (regs->r0) {
case ERESTARTNOHAND:
case ERESTARTSYS:
case ERESTARTNOINTR:
/* Reset v0 and a3 and replay syscall. */
regs->r0 = r0;
regs->r19 = r19;
regs->pc -= 4;
break;
case ERESTART_RESTARTBLOCK:
/* Force v0 to the restart syscall and reply. */
regs->r0 = __NR_restart_syscall;
regs->pc -= 4;
break;
syscall_restart(r0, r19, regs, &ksig.ka);
handle_signal(&ksig, regs);
} else {
single_stepping |= ptrace_cancel_bpt(current);
if (r0) {
switch (regs->r0) {
case ERESTARTNOHAND:
case ERESTARTSYS:
case ERESTARTNOINTR:
/* Reset v0 and a3 and replay syscall. */
regs->r0 = r0;
regs->r19 = r19;
regs->pc -= 4;
break;
case ERESTART_RESTARTBLOCK:
/* Set v0 to the restart_syscall and replay */
regs->r0 = __NR_restart_syscall;
regs->pc -= 4;
break;
}
}
restore_saved_sigmask();
}
/* If there's no signal to deliver, we just restore the saved mask. */
restore_saved_sigmask();
if (single_stepping)
ptrace_set_bpt(current); /* re-set breakpoint */
}