Merge tag 'backlight-next-4.20' of git://git.kernel.org/pub/scm/linux/kernel/git...

[linux] / kernel / ptrace.c

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 21fec73..80b34df 100644 (file)
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -261,6 +261,9 @@ static int ptrace_check_attach(struct task_struct *child, bool ignore_state)
 
 static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode)
 {
+       if (mode & PTRACE_MODE_SCHED)
+               return false;
+
        if (mode & PTRACE_MODE_NOAUDIT)
                return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE);
        else
@@ -328,9 +331,16 @@ ok:
             !ptrace_has_cap(mm->user_ns, mode)))
            return -EPERM;
 
+       if (mode & PTRACE_MODE_SCHED)
+               return 0;
        return security_ptrace_access_check(task, mode);
 }
 
+bool ptrace_may_access_sched(struct task_struct *task, unsigned int mode)
+{
+       return __ptrace_may_access(task, mode | PTRACE_MODE_SCHED);
+}
+
 bool ptrace_may_access(struct task_struct *task, unsigned int mode)
 {
        int err;
@@ -396,7 +406,7 @@ static int ptrace_attach(struct task_struct *task, long request,
 
        /* SEIZE doesn't trap tracee on attach */
        if (!seize)
-               send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
+               send_sig_info(SIGSTOP, SEND_SIG_PRIV, task);
 
        spin_lock(&task->sighand->siglock);
 
@@ -563,7 +573,7 @@ void exit_ptrace(struct task_struct *tracer, struct list_head *dead)
 
        list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
                if (unlikely(p->ptrace & PT_EXITKILL))
-                       send_sig_info(SIGKILL, SEND_SIG_FORCED, p);
+                       send_sig_info(SIGKILL, SEND_SIG_PRIV, p);
 
                if (__ptrace_detach(tracer, p))
                        list_add(&p->ptrace_entry, dead);
@@ -651,7 +661,7 @@ static int ptrace_setoptions(struct task_struct *child, unsigned long data)
        return 0;
 }
 
-static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
+static int ptrace_getsiginfo(struct task_struct *child, kernel_siginfo_t *info)
 {
        unsigned long flags;
        int error = -ESRCH;
@@ -667,7 +677,7 @@ static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
        return error;
 }
 
-static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
+static int ptrace_setsiginfo(struct task_struct *child, const kernel_siginfo_t *info)
 {
        unsigned long flags;
        int error = -ESRCH;
@@ -709,7 +719,7 @@ static int ptrace_peek_siginfo(struct task_struct *child,
                pending = &child->pending;
 
        for (i = 0; i < arg.nr; ) {
-               siginfo_t info;
+               kernel_siginfo_t info;
                s32 off = arg.off + i;
 
                spin_lock_irq(&child->sighand->siglock);
@@ -885,7 +895,7 @@ int ptrace_request(struct task_struct *child, long request,
 {
        bool seized = child->ptrace & PT_SEIZED;
        int ret = -EIO;
-       siginfo_t siginfo, *si;
+       kernel_siginfo_t siginfo, *si;
        void __user *datavp = (void __user *) data;
        unsigned long __user *datalp = datavp;
        unsigned long flags;
@@ -919,9 +929,8 @@ int ptrace_request(struct task_struct *child, long request,
                break;
 
        case PTRACE_SETSIGINFO:
-               if (copy_from_user(&siginfo, datavp, sizeof siginfo))
-                       ret = -EFAULT;
-               else
+               ret = copy_siginfo_from_user(&siginfo, datavp);
+               if (!ret)
                        ret = ptrace_setsiginfo(child, &siginfo);
                break;
 
@@ -1181,7 +1190,7 @@ int compat_ptrace_request(struct task_struct *child, compat_long_t request,
 {
        compat_ulong_t __user *datap = compat_ptr(data);
        compat_ulong_t word;
-       siginfo_t siginfo;
+       kernel_siginfo_t siginfo;
        int ret;
 
        switch (request) {
@@ -1215,10 +1224,9 @@ int compat_ptrace_request(struct task_struct *child, compat_long_t request,
                break;
 
        case PTRACE_SETSIGINFO:
-               if (copy_siginfo_from_user32(
-                           &siginfo, (struct compat_siginfo __user *) datap))
-                       ret = -EFAULT;
-               else
+               ret = copy_siginfo_from_user32(
+                       &siginfo, (struct compat_siginfo __user *) datap);
+               if (!ret)
                        ret = ptrace_setsiginfo(child, &siginfo);
                break;
 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK