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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
parent 5ce1a70e2f 235b80226b
commit 9e2d59ad58
185 changed files with 1361 additions and 4823 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/Kconfig
+26 -3
View File
@@ -368,9 +368,6 @@ config MODULES_USE_ELF_REL
Modules only use ELF REL relocations. Modules with ELF RELA
relocations will give an error.
config GENERIC_SIGALTSTACK
bool
#
# ABI hall of shame
#
@@ -385,4 +382,30 @@ config CLONE_BACKWARDS2
help
Architecture has the first two arguments of clone(2) swapped.
config ODD_RT_SIGACTION
bool
help
Architecture has unusual rt_sigaction(2) arguments
config OLD_SIGSUSPEND
bool
help
Architecture has old sigsuspend(2) syscall, of one-argument variety
config OLD_SIGSUSPEND3
bool
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"
arch/alpha/Kconfig
+2 -1
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,
arch/alpha/include/asm/signal.h
+1 -10
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
arch/alpha/include/asm/unistd.h
-1
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
arch/alpha/kernel/process.c
-1
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;
arch/alpha/kernel/signal.c
+45 -76
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 */
}
arch/arm/Kconfig
+2
View File
@@ -56,6 +56,8 @@ config ARM
select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
select MODULES_USE_ELF_REL
select CLONE_BACKWARDS
select OLD_SIGSUSPEND3
select OLD_SIGACTION
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and
arch/arm/include/asm/signal.h
+1 -17
View File
@@ -16,23 +16,7 @@ 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;
__sigrestore_t sa_restorer;
};
struct sigaction {
__sighandler_t sa_handler;
unsigned long sa_flags;
__sigrestore_t sa_restorer;
sigset_t sa_mask; /* mask last for extensibility */
};
struct k_sigaction {
struct sigaction sa;
};
#define __ARCH_HAS_SA_RESTORER
#include <asm/sigcontext.h>
#endif
arch/arm/include/asm/unistd.h
-2
View File
@@ -26,8 +26,6 @@
#define __ARCH_WANT_SYS_NICE
#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_OLD_MMAP
#define __ARCH_WANT_SYS_OLD_SELECT
arch/arm/kernel/calls.S
+1 -1
View File
@@ -195,7 +195,7 @@
CALL(sys_getcwd)
CALL(sys_capget)
/* 185 */ CALL(sys_capset)
CALL(sys_sigaltstack_wrapper)
CALL(sys_sigaltstack)
CALL(sys_sendfile)
CALL(sys_ni_syscall) /* getpmsg */
CALL(sys_ni_syscall) /* putpmsg */
arch/arm/kernel/entry-common.S
-5
View File
@@ -514,11 +514,6 @@ sys_rt_sigreturn_wrapper:
b sys_rt_sigreturn
ENDPROC(sys_rt_sigreturn_wrapper)
sys_sigaltstack_wrapper:
ldr r2, [sp, #S_OFF + S_SP]
b do_sigaltstack
ENDPROC(sys_sigaltstack_wrapper)
sys_statfs64_wrapper:
teq r1, #88
moveq r1, #84
arch/arm/kernel/signal.c
+50 -112
View File
@@ -45,48 +45,6 @@ const unsigned long sigreturn_codes[7] = {
MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
};
/*
* atomically swap in the new signal mask, and wait for a signal.
*/
asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask)
{
sigset_t blocked;
siginitset(&blocked, mask);
return sigsuspend(&blocked);
}
asmlinkage int
sys_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;
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;
}
#ifdef CONFIG_CRUNCH
static int preserve_crunch_context(struct crunch_sigframe __user *frame)
{
@@ -300,7 +258,7 @@ asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
if (restore_sigframe(regs, &frame->sig))
goto badframe;
if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT)
if (restore_altstack(&frame->sig.uc.uc_stack))
goto badframe;
return regs->ARM_r0;
@@ -360,17 +318,11 @@ setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set)
}
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize)
get_sigframe(struct ksignal *ksig, struct pt_regs *regs, int framesize)
{
unsigned long sp = regs->ARM_sp;
unsigned long sp = sigsp(regs->ARM_sp, ksig);
void __user *frame;
/*
* This is the X/Open sanctioned signal stack switching.
*/
if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
sp = current->sas_ss_sp + current->sas_ss_size;
/*
* ATPCS B01 mandates 8-byte alignment
*/
@@ -385,11 +337,22 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize)
return frame;
}
static int
setup_return(struct pt_regs *regs, struct k_sigaction *ka,
unsigned long __user *rc, void __user *frame, int usig)
/*
* translate the signal
*/
static inline int map_sig(int sig)
{
unsigned long handler = (unsigned long)ka->sa.sa_handler;
struct thread_info *thread = current_thread_info();
if (sig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
sig = thread->exec_domain->signal_invmap[sig];
return sig;
}
static int
setup_return(struct pt_regs *regs, struct ksignal *ksig,
unsigned long __user *rc, void __user *frame)
{
unsigned long handler = (unsigned long)ksig->ka.sa.sa_handler;
unsigned long retcode;
int thumb = 0;
unsigned long cpsr = regs->ARM_cpsr & ~(PSR_f | PSR_E_BIT);
@@ -399,7 +362,7 @@ setup_return(struct pt_regs *regs, struct k_sigaction *ka,
/*
* Maybe we need to deliver a 32-bit signal to a 26-bit task.
*/
if (ka->sa.sa_flags & SA_THIRTYTWO)
if (ksig->ka.sa.sa_flags & SA_THIRTYTWO)
cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
#ifdef CONFIG_ARM_THUMB
@@ -421,12 +384,12 @@ setup_return(struct pt_regs *regs, struct k_sigaction *ka,
}
#endif
if (ka->sa.sa_flags & SA_RESTORER) {
retcode = (unsigned long)ka->sa.sa_restorer;
if (ksig->ka.sa.sa_flags & SA_RESTORER) {
retcode = (unsigned long)ksig->ka.sa.sa_restorer;
} else {
unsigned int idx = thumb << 1;
if (ka->sa.sa_flags & SA_SIGINFO)
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
idx += 3;
if (__put_user(sigreturn_codes[idx], rc) ||
@@ -451,7 +414,7 @@ setup_return(struct pt_regs *regs, struct k_sigaction *ka,
}
}
regs->ARM_r0 = usig;
regs->ARM_r0 = map_sig(ksig->sig);
regs->ARM_sp = (unsigned long)frame;
regs->ARM_lr = retcode;
regs->ARM_pc = handler;
@@ -461,9 +424,9 @@ setup_return(struct pt_regs *regs, struct k_sigaction *ka,
}
static int
setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs)
setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
{
struct sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame));
struct sigframe __user *frame = get_sigframe(ksig, regs, sizeof(*frame));
int err = 0;
if (!frame)
@@ -476,36 +439,29 @@ setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *reg
err |= setup_sigframe(frame, regs, set);
if (err == 0)
err = setup_return(regs, ka, frame->retcode, frame, usig);
err = setup_return(regs, ksig, frame->retcode, frame);
return err;
}
static int
setup_rt_frame(int usig, 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)
{
struct rt_sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame));
stack_t stack;
struct rt_sigframe __user *frame = get_sigframe(ksig, regs, sizeof(*frame));
int err = 0;
if (!frame)
return 1;
err |= copy_siginfo_to_user(&frame->info, info);
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
__put_user_error(0, &frame->sig.uc.uc_flags, err);
__put_user_error(NULL, &frame->sig.uc.uc_link, err);
memset(&stack, 0, sizeof(stack));
stack.ss_sp = (void __user *)current->sas_ss_sp;
stack.ss_flags = sas_ss_flags(regs->ARM_sp);
stack.ss_size = current->sas_ss_size;
err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
err |= __save_altstack(&frame->sig.uc.uc_stack, regs->ARM_sp);
err |= setup_sigframe(&frame->sig, regs, set);
if (err == 0)
err = setup_return(regs, ka, frame->sig.retcode, frame, usig);
err = setup_return(regs, ksig, frame->sig.retcode, frame);
if (err == 0) {
/*
@@ -523,40 +479,25 @@ setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
/*
* OK, we're invoking a handler
*/
static void
handle_signal(unsigned long sig, struct k_sigaction *ka,
siginfo_t *info, struct pt_regs *regs)
static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
struct thread_info *thread = current_thread_info();
struct task_struct *tsk = current;
sigset_t *oldset = sigmask_to_save();
int usig = sig;
int ret;
/*
* translate the signal
*/
if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
usig = thread->exec_domain->signal_invmap[usig];
/*
* Set up the stack frame
*/
if (ka->sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(usig, ka, info, oldset, regs);
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(ksig, oldset, regs);
else
ret = setup_frame(usig, ka, oldset, regs);
ret = setup_frame(ksig, oldset, regs);
/*
* Check that the resulting registers are actually sane.
*/
ret |= !valid_user_regs(regs);
if (ret != 0) {
force_sigsegv(sig, tsk);
return;
}
signal_delivered(sig, info, ka, regs, 0);
signal_setup_done(ret, ksig, 0);
}
/*
@@ -571,9 +512,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
static int do_signal(struct pt_regs *regs, int syscall)
{
unsigned int retval = 0, continue_addr = 0, restart_addr = 0;
struct k_sigaction ka;
siginfo_t info;
int signr;
struct ksignal ksig;
int restart = 0;
/*
@@ -605,33 +544,32 @@ static int do_signal(struct pt_regs *regs, int syscall)
* Get the signal to deliver. When running under ptrace, at this
* point the debugger may change all our registers ...
*/
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
/*
* Depending on the signal settings we may need to revert the
* decision to restart the system call. But skip this if a
* debugger has chosen to restart at a different PC.
*/
if (regs->ARM_pc != restart_addr)
restart = 0;
if (signr > 0) {
if (unlikely(restart)) {
if (get_signal(&ksig)) {
/* handler */
if (unlikely(restart) && regs->ARM_pc == restart_addr) {
if (retval == -ERESTARTNOHAND ||
retval == -ERESTART_RESTARTBLOCK
|| (retval == -ERESTARTSYS
&& !(ka.sa.sa_flags & SA_RESTART))) {
&& !(ksig.ka.sa.sa_flags & SA_RESTART))) {
regs->ARM_r0 = -EINTR;
regs->ARM_pc = continue_addr;
}
}
handle_signal(signr, &ka, &info, regs);
return 0;
handle_signal(&ksig, regs);
} else {
/* no handler */
restore_saved_sigmask();
if (unlikely(restart) && regs->ARM_pc == restart_addr) {
regs->ARM_pc = continue_addr;
return restart;
}
}
restore_saved_sigmask();
if (unlikely(restart))
regs->ARM_pc = continue_addr;
return restart;
return 0;
}
asmlinkage int
arch/arm64/Kconfig
+2
View File
@@ -205,6 +205,8 @@ config COMPAT
depends on !ARM64_64K_PAGES
select COMPAT_BINFMT_ELF
select HAVE_UID16
select OLD_SIGSUSPEND3
select COMPAT_OLD_SIGACTION
help
This option enables support for a 32-bit EL0 running under a 64-bit
kernel at EL1. AArch32-specific components such as system calls,
arch/arm64/include/asm/syscalls.h
-2
View File
@@ -24,8 +24,6 @@
* System call wrappers implemented in kernel/entry.S.
*/
asmlinkage long sys_rt_sigreturn_wrapper(void);
asmlinkage long sys_sigaltstack_wrapper(const stack_t __user *uss,
stack_t __user *uoss);
#include <asm-generic/syscalls.h>
arch/arm64/include/asm/unistd.h
-2
View File
@@ -20,10 +20,8 @@
#define __ARCH_WANT_SYS_GETPGRP
#define __ARCH_WANT_SYS_LLSEEK
#define __ARCH_WANT_SYS_NICE
#define __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
#define __ARCH_WANT_SYS_SIGPENDING
#define __ARCH_WANT_SYS_SIGPROCMASK
#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_COMPAT_SYS_SENDFILE
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_VFORK
arch/arm64/include/asm/unistd32.h
+2 -2
View File
@@ -93,7 +93,7 @@ __SYSCALL(68, sys_ni_syscall) /* 68 was sys_sgetmask */
__SYSCALL(69, sys_ni_syscall) /* 69 was sys_ssetmask */
__SYSCALL(70, sys_setreuid16)
__SYSCALL(71, sys_setregid16)
__SYSCALL(72, compat_sys_sigsuspend)
__SYSCALL(72, sys_sigsuspend)
__SYSCALL(73, compat_sys_sigpending)
__SYSCALL(74, sys_sethostname)
__SYSCALL(75, compat_sys_setrlimit)
@@ -207,7 +207,7 @@ __SYSCALL(182, sys_chown16)
__SYSCALL(183, sys_getcwd)
__SYSCALL(184, sys_capget)
__SYSCALL(185, sys_capset)
__SYSCALL(186, compat_sys_sigaltstack_wrapper)
__SYSCALL(186, compat_sys_sigaltstack)
__SYSCALL(187, compat_sys_sendfile)
__SYSCALL(188, sys_ni_syscall) /* 188 reserved */
__SYSCALL(189, sys_ni_syscall) /* 189 reserved */
arch/arm64/kernel/entry.S
-5
View File
@@ -677,10 +677,5 @@ ENTRY(sys_rt_sigreturn_wrapper)
b sys_rt_sigreturn
ENDPROC(sys_rt_sigreturn_wrapper)
ENTRY(sys_sigaltstack_wrapper)
ldr x2, [sp, #S_SP]
b sys_sigaltstack
ENDPROC(sys_sigaltstack_wrapper)
ENTRY(handle_arch_irq)
.quad 0
arch/arm64/kernel/signal.c
+2 -15
View File
@@ -149,8 +149,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
if (restore_sigframe(regs, frame))
goto badframe;
if (do_sigaltstack(&frame->uc.uc_stack,
NULL, regs->sp) == -EFAULT)
if (restore_altstack(&frame->uc.uc_stack))
goto badframe;
return regs->regs[0];
@@ -164,12 +163,6 @@ badframe:
return 0;
}
asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
unsigned long sp)
{
return do_sigaltstack(uss, uoss, sp);
}
static int setup_sigframe(struct rt_sigframe __user *sf,
struct pt_regs *regs, sigset_t *set)
{
@@ -250,7 +243,6 @@ static int setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
stack_t stack;
int err = 0;
frame = get_sigframe(ka, regs);
@@ -260,12 +252,7 @@ static int setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
__put_user_error(0, &frame->uc.uc_flags, err);
__put_user_error(NULL, &frame->uc.uc_link, err);
memset(&stack, 0, sizeof(stack));
stack.ss_sp = (void __user *)current->sas_ss_sp;
stack.ss_flags = sas_ss_flags(regs->sp);
stack.ss_size = current->sas_ss_size;
err |= __copy_to_user(&frame->uc.uc_stack, &stack, sizeof(stack));
err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
err |= setup_sigframe(frame, regs, set);
if (err == 0) {
setup_return(regs, ka, frame, usig);
arch/arm64/kernel/signal32.c
+2 -218
View File
@@ -28,26 +28,6 @@
#include <asm/uaccess.h>
#include <asm/unistd32.h>
struct compat_sigaction {
compat_uptr_t sa_handler;
compat_ulong_t sa_flags;
compat_uptr_t sa_restorer;
compat_sigset_t sa_mask;
};
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;
};
typedef struct compat_sigaltstack {
compat_uptr_t ss_sp;
int ss_flags;
compat_size_t ss_size;
} compat_stack_t;
struct compat_sigcontext {
/* We always set these two fields to 0 */
compat_ulong_t trap_no;
@@ -339,127 +319,6 @@ static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
return err ? -EFAULT : 0;
}
/*
* atomically swap in the new signal mask, and wait for a signal.
*/
asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask,
compat_old_sigset_t mask)
{
sigset_t blocked;
siginitset(&current->blocked, mask);
return sigsuspend(&blocked);
}
asmlinkage int compat_sys_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;
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;
}
asmlinkage int compat_sys_rt_sigaction(int sig,
const struct compat_sigaction __user *act,
struct compat_sigaction __user *oact,
compat_size_t sigsetsize)
{
struct k_sigaction new_ka, old_ka;
int ret;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (act) {
compat_uptr_t handler, restorer;
ret = get_user(handler, &act->sa_handler);
new_ka.sa.sa_handler = compat_ptr(handler);
ret |= get_user(restorer, &act->sa_restorer);
new_ka.sa.sa_restorer = compat_ptr(restorer);
ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
if (ret)
return -EFAULT;
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
}
return ret;
}
int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss,
compat_ulong_t sp)
{
compat_stack_t __user *newstack = compat_ptr(compat_uss);
compat_stack_t __user *oldstack = compat_ptr(compat_uoss);
compat_uptr_t ss_sp;
int ret;
mm_segment_t old_fs;
stack_t uss, uoss;
/* Marshall the compat new stack into a stack_t */
if (newstack) {
if (get_user(ss_sp, &newstack->ss_sp) ||
__get_user(uss.ss_flags, &newstack->ss_flags) ||
__get_user(uss.ss_size, &newstack->ss_size))
return -EFAULT;
uss.ss_sp = compat_ptr(ss_sp);
}
old_fs = get_fs();
set_fs(KERNEL_DS);
/* The __user pointer casts are valid because of the set_fs() */
ret = do_sigaltstack(
newstack ? (stack_t __user *) &uss : NULL,
oldstack ? (stack_t __user *) &uoss : NULL,
(unsigned long)sp);
set_fs(old_fs);
/* Convert the old stack_t into a compat stack. */
if (!ret && oldstack &&
(put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
__put_user(uoss.ss_flags, &oldstack->ss_flags) ||
__put_user(uoss.ss_size, &oldstack->ss_size)))
return -EFAULT;
return ret;
}
static int compat_restore_sigframe(struct pt_regs *regs,
struct compat_sigframe __user *sf)
{
@@ -562,9 +421,7 @@ asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
if (compat_restore_sigframe(regs, &frame->sig))
goto badframe;
if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack),
ptr_to_compat((void __user *)NULL),
regs->compat_sp) == -EFAULT)
if (compat_restore_altstack(&frame->sig.uc.uc_stack))
goto badframe;
return regs->regs[0];
@@ -705,11 +562,7 @@ int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
__put_user_error(0, &frame->sig.uc.uc_flags, err);
__put_user_error(0, &frame->sig.uc.uc_link, err);
memset(&stack, 0, sizeof(stack));
stack.ss_sp = (compat_uptr_t)current->sas_ss_sp;
stack.ss_flags = sas_ss_flags(regs->compat_sp);
stack.ss_size = current->sas_ss_size;
err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
err |= __compat_save_altstack(&frame->sig.uc.uc_stack, regs->compat_sp);
err |= compat_setup_sigframe(&frame->sig, regs, set);
@@ -742,75 +595,6 @@ int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set,
return err;
}
/*
* RT signals don't have generic compat wrappers.
* See arch/powerpc/kernel/signal_32.c
*/
asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
compat_sigset_t __user *oset,
compat_size_t sigsetsize)
{
sigset_t s;
sigset_t __user *up;
int ret;
mm_segment_t old_fs = get_fs();
if (set) {
if (get_sigset_t(&s, set))
return -EFAULT;
}
set_fs(KERNEL_DS);
/* This is valid because of the set_fs() */
up = (sigset_t __user *) &s;
ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL,
sigsetsize);
set_fs(old_fs);
if (ret)
return ret;
if (oset) {
if (put_sigset_t(oset, &s))
return -EFAULT;
}
return 0;
}
asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set,
compat_size_t sigsetsize)
{
sigset_t s;
int ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
/* The __user pointer cast is valid because of the set_fs() */
ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
set_fs(old_fs);
if (!ret) {
if (put_sigset_t(set, &s))
return -EFAULT;
}
return ret;
}
asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig,
compat_siginfo_t __user *uinfo)
{
siginfo_t info;
int ret;
mm_segment_t old_fs = get_fs();
ret = copy_siginfo_from_user32(&info, uinfo);
if (unlikely(ret))
return ret;
set_fs (KERNEL_DS);
/* The __user pointer cast is valid because of the set_fs() */
ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
set_fs (old_fs);
return ret;
}
void compat_setup_restart_syscall(struct pt_regs *regs)
{
regs->regs[7] = __NR_compat_restart_syscall;
arch/arm64/kernel/sys.c
-1
View File
@@ -40,7 +40,6 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
* Wrappers to pass the pt_regs argument.
*/
#define sys_rt_sigreturn sys_rt_sigreturn_wrapper
#define sys_sigaltstack sys_sigaltstack_wrapper
#include <asm/syscalls.h>

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