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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 18:50:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 18:50:11 -0800
commit9e2d59ad580d590134285f361a0e80f0e98c0207 (patch)
treef3232be75781484193413f32ec82c21f6d8eb76e /arch/cris
parent5ce1a70e2f00f0bce0cab57f798ca354b9496169 (diff)
parent235b80226b986dabcbba844968f7807866bd0bfe (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal
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() ...
Diffstat (limited to 'arch/cris')
-rw-r--r--arch/cris/Kconfig2
-rw-r--r--arch/cris/arch-v10/kernel/signal.c65
-rw-r--r--arch/cris/arch-v32/kernel/signal.c68
-rw-r--r--arch/cris/include/asm/signal.h19
-rw-r--r--arch/cris/include/asm/unistd.h2
5 files changed, 17 insertions, 139 deletions
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index c59a01dd9c0..0e5c187ac7d 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -50,6 +50,8 @@ config CRIS
select GENERIC_CMOS_UPDATE
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS2
+ select OLD_SIGSUSPEND
+ select OLD_SIGACTION
config HZ
int
diff --git a/arch/cris/arch-v10/kernel/signal.c b/arch/cris/arch-v10/kernel/signal.c
index 0bb477c13a4..61ce6273a89 100644
--- a/arch/cris/arch-v10/kernel/signal.c
+++ b/arch/cris/arch-v10/kernel/signal.c
@@ -42,55 +42,6 @@
void do_signal(int canrestart, struct pt_regs *regs);
/*
- * Atomically swap in the new signal mask, and wait for a signal. Define
- * dummy arguments to be able to reach the regs argument. (Note that this
- * arrangement relies on old_sigset_t occupying one register.)
- */
-int sys_sigsuspend(old_sigset_t mask)
-{
- sigset_t blocked;
- siginitset(&blocked, mask);
- return sigsuspend(&blocked);
-}
-
-int sys_sigaction(int sig, const struct old_sigaction __user *act,
- struct old_sigaction *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;
- 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;
-}
-
-int sys_sigaltstack(const stack_t *uss, stack_t __user *uoss)
-{
- return do_sigaltstack(uss, uoss, rdusp());
-}
-
-
-/*
* Do a signal return; undo the signal stack.
*/
@@ -150,11 +101,9 @@ badframe:
return 1;
}
-/* Define dummy arguments to be able to reach the regs argument. */
-
-asmlinkage int sys_sigreturn(long r10, long r11, long r12, long r13, long mof,
- long srp, struct pt_regs *regs)
+asmlinkage int sys_sigreturn(void)
{
+ struct pt_regs *regs = current_pt_regs();
struct sigframe __user *frame = (struct sigframe *)rdusp();
sigset_t set;
@@ -188,11 +137,9 @@ badframe:
return 0;
}
-/* Define dummy arguments to be able to reach the regs argument. */
-
-asmlinkage int sys_rt_sigreturn(long r10, long r11, long r12, long r13,
- long mof, long srp, struct pt_regs *regs)
+asmlinkage int sys_rt_sigreturn(void)
{
+ struct pt_regs *regs = current_pt_regs();
struct rt_sigframe __user *frame = (struct rt_sigframe *)rdusp();
sigset_t set;
@@ -214,7 +161,7 @@ asmlinkage int sys_rt_sigreturn(long r10, long r11, long r12, long r13,
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
- if (do_sigaltstack(&frame->uc.uc_stack, NULL, rdusp()) == -EFAULT)
+ if (restore_altstack(&frame->uc.uc_stack))
goto badframe;
return regs->r10;
@@ -362,6 +309,8 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ err |= __save_altstack(&frame->uc.uc_stack, rdusp());
+
if (err)
goto give_sigsegv;
diff --git a/arch/cris/arch-v32/kernel/signal.c b/arch/cris/arch-v32/kernel/signal.c
index b60d1b65a42..01d1375c900 100644
--- a/arch/cris/arch-v32/kernel/signal.c
+++ b/arch/cris/arch-v32/kernel/signal.c
@@ -51,59 +51,6 @@ struct rt_signal_frame {
void do_signal(int restart, struct pt_regs *regs);
void keep_debug_flags(unsigned long oldccs, unsigned long oldspc,
struct pt_regs *regs);
-/*
- * Swap in the new signal mask, and wait for a signal. Define some
- * dummy arguments to be able to reach the regs argument.
- */
-int
-sys_sigsuspend(old_sigset_t mask)
-{
- sigset_t blocked;
- siginitset(&blocked, mask);
- return sigsuspend(&blocked);
-}
-
-int
-sys_sigaction(int signal, const struct old_sigaction *act,
- struct old_sigaction *oact)
-{
- int retval;
- struct k_sigaction newk;
- struct k_sigaction oldk;
-
- if (act) {
- old_sigset_t mask;
-
- if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
- __get_user(newk.sa.sa_handler, &act->sa_handler) ||
- __get_user(newk.sa.sa_restorer, &act->sa_restorer) ||
- __get_user(newk.sa.sa_flags, &act->sa_flags) ||
- __get_user(mask, &act->sa_mask))
- return -EFAULT;
-
- siginitset(&newk.sa.sa_mask, mask);
- }
-
- retval = do_sigaction(signal, act ? &newk : NULL, oact ? &oldk : NULL);
-
- if (!retval && oact) {
- if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
- __put_user(oldk.sa.sa_handler, &oact->sa_handler) ||
- __put_user(oldk.sa.sa_restorer, &oact->sa_restorer) ||
- __put_user(oldk.sa.sa_flags, &oact->sa_flags) ||
- __put_user(oldk.sa.sa_mask.sig[0], &oact->sa_mask))
- return -EFAULT;
-
- }
-
- return retval;
-}
-
-int
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
-{
- return do_sigaltstack(uss, uoss, rdusp());
-}
static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
@@ -135,11 +82,9 @@ badframe:
return 1;
}
-/* Define some dummy arguments to be able to reach the regs argument. */
-asmlinkage int
-sys_sigreturn(long r10, long r11, long r12, long r13, long mof, long srp,
- struct pt_regs *regs)
+asmlinkage int sys_sigreturn(void)
{
+ struct pt_regs *regs = current_pt_regs();
sigset_t set;
struct signal_frame __user *frame;
unsigned long oldspc = regs->spc;
@@ -178,11 +123,9 @@ badframe:
return 0;
}
-/* Define some dummy variables to be able to reach the regs argument. */
-asmlinkage int
-sys_rt_sigreturn(long r10, long r11, long r12, long r13, long mof, long srp,
- struct pt_regs *regs)
+asmlinkage int sys_rt_sigreturn(void)
{
+ struct pt_regs *regs = current_pt_regs();
sigset_t set;
struct rt_signal_frame __user *frame;
unsigned long oldspc = regs->spc;
@@ -209,7 +152,7 @@ sys_rt_sigreturn(long r10, long r11, long r12, long r13, long mof, long srp,
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
- if (do_sigaltstack(&frame->uc.uc_stack, NULL, rdusp()) == -EFAULT)
+ if (restore_altstack(&frame->uc.uc_stack))
goto badframe;
keep_debug_flags(oldccs, oldspc, regs);
@@ -371,6 +314,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ err |= __save_altstack(&frame->uc.uc_stack, rdusp());
if (err)
goto give_sigsegv;
diff --git a/arch/cris/include/asm/signal.h b/arch/cris/include/asm/signal.h
index c0cb1fd4644..c11b8745cec 100644
--- a/arch/cris/include/asm/signal.h
+++ b/arch/cris/include/asm/signal.h
@@ -16,23 +16,8 @@ typedef struct {
unsigned long sig[_NSIG_WORDS];
} sigset_t;
-struct old_sigaction {
- __sighandler_t sa_handler;
- old_sigset_t sa_mask;
- unsigned long sa_flags;
- void (*sa_restorer)(void);
-};
-
-struct sigaction {
- __sighandler_t sa_handler;
- unsigned long sa_flags;
- void (*sa_restorer)(void);
- sigset_t sa_mask; /* mask last for extensibility */
-};
-
-struct k_sigaction {
- struct sigaction sa;
-};
+#define __ARCH_HAS_SA_RESTORER
+
#include <asm/sigcontext.h>
#endif
diff --git a/arch/cris/include/asm/unistd.h b/arch/cris/include/asm/unistd.h
index 6d062bdf92d..be57a988bfb 100644
--- a/arch/cris/include/asm/unistd.h
+++ b/arch/cris/include/asm/unistd.h
@@ -30,8 +30,6 @@
#define __ARCH_WANT_SYS_OLDUMOUNT
#define __ARCH_WANT_SYS_SIGPENDING
#define __ARCH_WANT_SYS_SIGPROCMASK
-#define __ARCH_WANT_SYS_RT_SIGACTION
-#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_VFORK
#define __ARCH_WANT_SYS_CLONE