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Diffstat (limited to 'arch/sparc/kernel/signal_32.c')
-rw-r--r--arch/sparc/kernel/signal_32.c86
1 files changed, 48 insertions, 38 deletions
diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c
index 7d5d8e1f8415..478014d2e59b 100644
--- a/arch/sparc/kernel/signal_32.c
+++ b/arch/sparc/kernel/signal_32.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/* linux/arch/sparc/kernel/signal.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
@@ -18,16 +19,15 @@
#include <linux/smp.h>
#include <linux/binfmts.h> /* do_coredum */
#include <linux/bitops.h>
-#include <linux/tracehook.h>
+#include <linux/resume_user_mode.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <asm/ptrace.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
#include <asm/cacheflush.h> /* flush_sig_insns */
#include <asm/switch_to.h>
#include "sigutil.h"
+#include "kernel.h"
extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
void *fpqueue, unsigned long *fpqdepth);
@@ -59,27 +59,42 @@ struct rt_signal_frame {
#define SF_ALIGNEDSZ (((sizeof(struct signal_frame) + 7) & (~7)))
#define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
+/* Checks if the fp is valid. We always build signal frames which are
+ * 16-byte aligned, therefore we can always enforce that the restore
+ * frame has that property as well.
+ */
+static inline bool invalid_frame_pointer(void __user *fp, int fplen)
+{
+ if ((((unsigned long) fp) & 15) || !access_ok(fp, fplen))
+ return true;
+
+ return false;
+}
+
asmlinkage void do_sigreturn(struct pt_regs *regs)
{
+ unsigned long up_psr, pc, npc, ufp;
struct signal_frame __user *sf;
- unsigned long up_psr, pc, npc;
sigset_t set;
__siginfo_fpu_t __user *fpu_save;
__siginfo_rwin_t __user *rwin_save;
int err;
/* Always make any pending restarted system calls return -EINTR */
- current_thread_info()->restart_block.fn = do_no_restart_syscall;
+ current->restart_block.fn = do_no_restart_syscall;
synchronize_user_stack();
sf = (struct signal_frame __user *) regs->u_regs[UREG_FP];
/* 1. Make sure we are not getting garbage from the user */
- if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
+ if (invalid_frame_pointer(sf, sizeof(*sf)))
goto segv_and_exit;
- if (((unsigned long) sf) & 3)
+ if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
+ goto segv_and_exit;
+
+ if (ufp & 0x7)
goto segv_and_exit;
err = __get_user(pc, &sf->info.si_regs.pc);
@@ -120,13 +135,13 @@ asmlinkage void do_sigreturn(struct pt_regs *regs)
return;
segv_and_exit:
- force_sig(SIGSEGV, current);
+ force_sig(SIGSEGV);
}
asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
{
struct rt_signal_frame __user *sf;
- unsigned int psr, pc, npc;
+ unsigned int psr, pc, npc, ufp;
__siginfo_fpu_t __user *fpu_save;
__siginfo_rwin_t __user *rwin_save;
sigset_t set;
@@ -134,8 +149,13 @@ asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
synchronize_user_stack();
sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
- if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
- (((unsigned long) sf) & 0x03))
+ if (invalid_frame_pointer(sf, sizeof(*sf)))
+ goto segv;
+
+ if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
+ goto segv;
+
+ if (ufp & 0x7)
goto segv;
err = __get_user(pc, &sf->regs.pc);
@@ -174,16 +194,7 @@ asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
set_current_blocked(&set);
return;
segv:
- force_sig(SIGSEGV, current);
-}
-
-/* Checks if the fp is valid */
-static inline int invalid_frame_pointer(void __user *fp, int fplen)
-{
- if ((((unsigned long) fp) & 7) || !__access_ok((unsigned long)fp, fplen))
- return 1;
-
- return 0;
+ force_sig(SIGSEGV);
}
static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
@@ -233,7 +244,7 @@ static int setup_frame(struct ksignal *ksig, struct pt_regs *regs,
get_sigframe(ksig, regs, sigframe_size);
if (invalid_frame_pointer(sf, sigframe_size)) {
- do_exit(SIGILL);
+ force_exit_sig(SIGILL);
return -EINVAL;
}
@@ -325,7 +336,7 @@ static int setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs,
sf = (struct rt_signal_frame __user *)
get_sigframe(ksig, regs, sigframe_size);
if (invalid_frame_pointer(sf, sigframe_size)) {
- do_exit(SIGILL);
+ force_exit_sig(SIGILL);
return -EINVAL;
}
@@ -341,7 +352,7 @@ static int setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs,
err |= __put_user(0, &sf->extra_size);
if (psr & PSR_EF) {
- __siginfo_fpu_t *fp = tail;
+ __siginfo_fpu_t __user *fp = tail;
tail += sizeof(*fp);
err |= save_fpu_state(regs, fp);
err |= __put_user(fp, &sf->fpu_save);
@@ -349,7 +360,7 @@ static int setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs,
err |= __put_user(0, &sf->fpu_save);
}
if (wsaved) {
- __siginfo_rwin_t *rwp = tail;
+ __siginfo_rwin_t __user *rwp = tail;
tail += sizeof(*rwp);
err |= save_rwin_state(wsaved, rwp);
err |= __put_user(rwp, &sf->rwin_save);
@@ -389,8 +400,8 @@ static int setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs,
else {
regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
- /* mov __NR_sigreturn, %g1 */
- err |= __put_user(0x821020d8, &sf->insns[0]);
+ /* mov __NR_rt_sigreturn, %g1 */
+ err |= __put_user(0x82102065, &sf->insns[0]);
/* t 0x10 */
err |= __put_user(0x91d02010, &sf->insns[1]);
@@ -429,7 +440,7 @@ static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
case ERESTARTSYS:
if (!(sa->sa_flags & SA_RESTART))
goto no_system_call_restart;
- /* fallthrough */
+ fallthrough;
case ERESTARTNOINTR:
regs->u_regs[UREG_I0] = orig_i0;
regs->pc -= 4;
@@ -462,7 +473,7 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
*
* %g7 is used as the "thread register". %g6 is not used in
* any fixed manner. %g6 is used as a scratch register and
- * a compiler temporary, but it's value is never used across
+ * a compiler temporary, but its value is never used across
* a system call. Therefore %g6 is usable for orig_i0 storage.
*/
if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C))
@@ -495,6 +506,7 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
regs->pc -= 4;
regs->npc -= 4;
pt_regs_clear_syscall(regs);
+ fallthrough;
case ERESTART_RESTARTBLOCK:
regs->u_regs[UREG_G1] = __NR_restart_syscall;
regs->pc -= 4;
@@ -509,17 +521,15 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0,
unsigned long thread_info_flags)
{
- if (thread_info_flags & _TIF_SIGPENDING)
+ if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
do_signal(regs, orig_i0);
- if (thread_info_flags & _TIF_NOTIFY_RESUME) {
- clear_thread_flag(TIF_NOTIFY_RESUME);
- tracehook_notify_resume(regs);
- }
+ if (thread_info_flags & _TIF_NOTIFY_RESUME)
+ resume_user_mode_work(regs);
}
-asmlinkage int
-do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
- unsigned long sp)
+asmlinkage int do_sys_sigstack(struct sigstack __user *ssptr,
+ struct sigstack __user *ossptr,
+ unsigned long sp)
{
int ret = -EFAULT;
generated by cgit (git 2.34.1) at 2025-12-25 04:42:03 +0000