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Diffstat (limited to 'arch/tile/kernel/compat_signal.c')
-rw-r--r--arch/tile/kernel/compat_signal.c218
1 files changed, 18 insertions, 200 deletions
diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c
index fb64b99959d..19c04b5ce40 100644
--- a/arch/tile/kernel/compat_signal.c
+++ b/arch/tile/kernel/compat_signal.c
@@ -15,7 +15,6 @@
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
-#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
@@ -33,21 +32,9 @@
#include <asm/ucontext.h>
#include <asm/sigframe.h>
#include <asm/syscalls.h>
+#include <asm/vdso.h>
#include <arch/interrupts.h>
-struct compat_sigaction {
- compat_uptr_t sa_handler;
- compat_ulong_t sa_flags;
- compat_uptr_t sa_restorer;
- sigset_t sa_mask __packed;
-};
-
-struct compat_sigaltstack {
- compat_uptr_t ss_sp;
- int ss_flags;
- compat_size_t ss_size;
-};
-
struct compat_ucontext {
compat_ulong_t uc_flags;
compat_uptr_t uc_link;
@@ -56,129 +43,13 @@ struct compat_ucontext {
sigset_t uc_sigmask; /* mask last for extensibility */
};
-#define COMPAT_SI_PAD_SIZE ((SI_MAX_SIZE - 3 * sizeof(int)) / sizeof(int))
-
-struct compat_siginfo {
- int si_signo;
- int si_errno;
- int si_code;
-
- union {
- int _pad[COMPAT_SI_PAD_SIZE];
-
- /* kill() */
- struct {
- unsigned int _pid; /* sender's pid */
- unsigned int _uid; /* sender's uid */
- } _kill;
-
- /* POSIX.1b timers */
- struct {
- compat_timer_t _tid; /* timer id */
- int _overrun; /* overrun count */
- compat_sigval_t _sigval; /* same as below */
- int _sys_private; /* not to be passed to user */
- int _overrun_incr; /* amount to add to overrun */
- } _timer;
-
- /* POSIX.1b signals */
- struct {
- unsigned int _pid; /* sender's pid */
- unsigned int _uid; /* sender's uid */
- compat_sigval_t _sigval;
- } _rt;
-
- /* SIGCHLD */
- struct {
- unsigned int _pid; /* which child */
- unsigned int _uid; /* sender's uid */
- int _status; /* exit code */
- compat_clock_t _utime;
- compat_clock_t _stime;
- } _sigchld;
-
- /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
- struct {
- unsigned int _addr; /* faulting insn/memory ref. */
-#ifdef __ARCH_SI_TRAPNO
- int _trapno; /* TRAP # which caused the signal */
-#endif
- } _sigfault;
-
- /* SIGPOLL */
- struct {
- int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
- int _fd;
- } _sigpoll;
- } _sifields;
-};
-
struct compat_rt_sigframe {
unsigned char save_area[C_ABI_SAVE_AREA_SIZE]; /* caller save area */
struct compat_siginfo info;
struct compat_ucontext uc;
};
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-long compat_sys_rt_sigaction(int sig, struct compat_sigaction __user *act,
- struct compat_sigaction __user *oact,
- size_t sigsetsize)
-{
- struct k_sigaction new_sa, old_sa;
- int ret = -EINVAL;
-
- /* XXX: Don't preclude handling different sized sigset_t's. */
- if (sigsetsize != sizeof(sigset_t))
- goto out;
-
- if (act) {
- compat_uptr_t handler, restorer;
-
- if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
- __get_user(handler, &act->sa_handler) ||
- __get_user(new_sa.sa.sa_flags, &act->sa_flags) ||
- __get_user(restorer, &act->sa_restorer) ||
- __copy_from_user(&new_sa.sa.sa_mask, &act->sa_mask,
- sizeof(sigset_t)))
- return -EFAULT;
- new_sa.sa.sa_handler = compat_ptr(handler);
- new_sa.sa.sa_restorer = compat_ptr(restorer);
- }
-
- ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
-
- if (!ret && oact) {
- if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
- __put_user(ptr_to_compat(old_sa.sa.sa_handler),
- &oact->sa_handler) ||
- __put_user(ptr_to_compat(old_sa.sa.sa_restorer),
- &oact->sa_restorer) ||
- __put_user(old_sa.sa.sa_flags, &oact->sa_flags) ||
- __copy_to_user(&oact->sa_mask, &old_sa.sa.sa_mask,
- sizeof(sigset_t)))
- return -EFAULT;
- }
-out:
- return ret;
-}
-
-long compat_sys_rt_sigqueueinfo(int pid, int sig,
- struct compat_siginfo __user *uinfo)
-{
- siginfo_t info;
- int ret;
- mm_segment_t old_fs = get_fs();
-
- if (copy_siginfo_from_user32(&info, uinfo))
- return -EFAULT;
- set_fs(KERNEL_DS);
- ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *)&info);
- set_fs(old_fs);
- return ret;
-}
-
-int copy_siginfo_to_user32(struct compat_siginfo __user *to, siginfo_t *from)
+int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from)
{
int err;
@@ -256,69 +127,31 @@ int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
return err;
}
-long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
- struct compat_sigaltstack __user *uoss_ptr,
- struct pt_regs *regs)
-{
- stack_t uss, uoss;
- int ret;
- mm_segment_t seg;
-
- if (uss_ptr) {
- u32 ptr;
-
- memset(&uss, 0, sizeof(stack_t));
- if (!access_ok(VERIFY_READ, uss_ptr, sizeof(*uss_ptr)) ||
- __get_user(ptr, &uss_ptr->ss_sp) ||
- __get_user(uss.ss_flags, &uss_ptr->ss_flags) ||
- __get_user(uss.ss_size, &uss_ptr->ss_size))
- return -EFAULT;
- uss.ss_sp = compat_ptr(ptr);
- }
- seg = get_fs();
- set_fs(KERNEL_DS);
- ret = do_sigaltstack(uss_ptr ? (stack_t __user __force *)&uss : NULL,
- (stack_t __user __force *)&uoss,
- (unsigned long)compat_ptr(regs->sp));
- set_fs(seg);
- if (ret >= 0 && uoss_ptr) {
- if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(*uoss_ptr)) ||
- __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) ||
- __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) ||
- __put_user(uoss.ss_size, &uoss_ptr->ss_size))
- ret = -EFAULT;
- }
- return ret;
-}
-
-long compat_sys_rt_sigreturn(struct pt_regs *regs)
+/* The assembly shim for this function arranges to ignore the return value. */
+long compat_sys_rt_sigreturn(void)
{
+ struct pt_regs *regs = current_pt_regs();
struct compat_rt_sigframe __user *frame =
(struct compat_rt_sigframe __user *) compat_ptr(regs->sp);
sigset_t set;
- long r0;
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
goto badframe;
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(&current->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
+ set_current_blocked(&set);
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
+ if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
- if (compat_sys_sigaltstack(&frame->uc.uc_stack, NULL, regs) != 0)
+ if (compat_restore_altstack(&frame->uc.uc_stack))
goto badframe;
- return r0;
+ return 0;
badframe:
- force_sig(SIGSEGV, current);
+ signal_fault("bad sigreturn frame", regs, frame, 0);
return 0;
}
@@ -389,17 +222,13 @@ int compat_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
err |= __put_user(0, &frame->uc.uc_flags);
err |= __put_user(0, &frame->uc.uc_link);
- err |= __put_user(ptr_to_compat((void *)(current->sas_ss_sp)),
- &frame->uc.uc_stack.ss_sp);
- err |= __put_user(sas_ss_flags(regs->sp),
- &frame->uc.uc_stack.ss_flags);
- err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+ err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
goto give_sigsegv;
- restorer = VDSO_BASE;
+ restorer = VDSO_SYM(&__vdso_rt_sigreturn);
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ptr_to_compat_reg(ka->sa.sa_restorer);
@@ -407,31 +236,20 @@ int compat_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
* Set up registers for signal handler.
* Registers that we don't modify keep the value they had from
* user-space at the time we took the signal.
+ * We always pass siginfo and mcontext, regardless of SA_SIGINFO,
+ * since some things rely on this (e.g. glibc's debug/segfault.c).
*/
regs->pc = ptr_to_compat_reg(ka->sa.sa_handler);
regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
regs->sp = ptr_to_compat_reg(frame);
regs->lr = restorer;
regs->regs[0] = (unsigned long) usig;
-
- if (ka->sa.sa_flags & SA_SIGINFO) {
- /* Need extra arguments, so mark to restore caller-saves. */
- regs->regs[1] = ptr_to_compat_reg(&frame->info);
- regs->regs[2] = ptr_to_compat_reg(&frame->uc);
- regs->flags |= PT_FLAGS_CALLER_SAVES;
- }
-
- /*
- * Notify any tracer that was single-stepping it.
- * The tracer may want to single-step inside the
- * handler too.
- */
- if (test_thread_flag(TIF_SINGLESTEP))
- ptrace_notify(SIGTRAP);
-
+ regs->regs[1] = ptr_to_compat_reg(&frame->info);
+ regs->regs[2] = ptr_to_compat_reg(&frame->uc);
+ regs->flags |= PT_FLAGS_CALLER_SAVES;
return 0;
give_sigsegv:
- force_sigsegv(sig, current);
+ signal_fault("bad setup frame", regs, frame, sig);
return -EFAULT;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 13:17:20 +0000