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ptrace/xtensa: Replace PT_SINGLESTEP with TIF_SINGLESTEP
commit 4a3d2717d1
upstream.
xtensa is the last user of the PT_SINGLESTEP flag. Changing tsk->ptrace in
user_enable_single_step and user_disable_single_step without locking could
potentiallly cause problems.
So use a thread info flag instead of a flag in tsk->ptrace. Use TIF_SINGLESTEP
that xtensa already had defined but unused.
Remove the definitions of PT_SINGLESTEP and PT_BLOCKSTEP as they have no more users.
Cc: stable@vger.kernel.org
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Tested-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lkml.kernel.org/r/20220505182645.497868-4-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
b3c352b94e
commit
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3 changed files with 4 additions and 10 deletions
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@ -226,12 +226,12 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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void user_enable_single_step(struct task_struct *child)
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{
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child->ptrace |= PT_SINGLESTEP;
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set_tsk_thread_flag(child, TIF_SINGLESTEP);
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}
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void user_disable_single_step(struct task_struct *child)
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{
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child->ptrace &= ~PT_SINGLESTEP;
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clear_tsk_thread_flag(child, TIF_SINGLESTEP);
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}
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/*
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@ -465,7 +465,7 @@ static void do_signal(struct pt_regs *regs)
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/* Set up the stack frame */
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ret = setup_frame(&ksig, sigmask_to_save(), regs);
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signal_setup_done(ret, &ksig, 0);
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if (current->ptrace & PT_SINGLESTEP)
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if (test_thread_flag(TIF_SINGLESTEP))
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task_pt_regs(current)->icountlevel = 1;
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return;
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@ -491,7 +491,7 @@ static void do_signal(struct pt_regs *regs)
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/* If there's no signal to deliver, we just restore the saved mask. */
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restore_saved_sigmask();
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if (current->ptrace & PT_SINGLESTEP)
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if (test_thread_flag(TIF_SINGLESTEP))
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task_pt_regs(current)->icountlevel = 1;
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return;
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}
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@ -46,12 +46,6 @@ extern int ptrace_access_vm(struct task_struct *tsk, unsigned long addr,
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#define PT_EXITKILL (PTRACE_O_EXITKILL << PT_OPT_FLAG_SHIFT)
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#define PT_SUSPEND_SECCOMP (PTRACE_O_SUSPEND_SECCOMP << PT_OPT_FLAG_SHIFT)
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/* single stepping state bits (used on ARM and PA-RISC) */
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#define PT_SINGLESTEP_BIT 31
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#define PT_SINGLESTEP (1<<PT_SINGLESTEP_BIT)
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#define PT_BLOCKSTEP_BIT 30
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#define PT_BLOCKSTEP (1<<PT_BLOCKSTEP_BIT)
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extern long arch_ptrace(struct task_struct *child, long request,
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unsigned long addr, unsigned long data);
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extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len);
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