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ptrace: move clearing of TIF_SYSCALL_EMU flag to core

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While the TIF_SYSCALL_EMU is set in ptrace_resume independent of any
architecture, currently only powerpc and x86 unset the TIF_SYSCALL_EMU
flag in ptrace_disable which gets called from ptrace_detach.

Let's move the clearing of TIF_SYSCALL_EMU flag to __ptrace_unlink
which gets executed from ptrace_detach and also keep it along with
or close to clearing of TIF_SYSCALL_TRACE.

Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Sudeep Holla 2019-05-23 10:06:15 +01:00 committed by Catalin Marinas
parent 6168103600
commit 15532fd6f5
3 changed files with 3 additions and 4 deletions
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1
arch/powerpc/kernel/ptrace.c
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@ -2521,7 +2521,6 @@ void ptrace_disable(struct task_struct *child)
{ {
/* make sure the single step bit is not set. */ /* make sure the single step bit is not set. */
user_disable_single_step(child); user_disable_single_step(child);
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
} }
#ifdef CONFIG_PPC_ADV_DEBUG_REGS #ifdef CONFIG_PPC_ADV_DEBUG_REGS

3
arch/x86/kernel/ptrace.c
View File

@ -747,9 +747,6 @@ static int ioperm_get(struct task_struct *target,
void ptrace_disable(struct task_struct *child) void ptrace_disable(struct task_struct *child)
{ {
user_disable_single_step(child); user_disable_single_step(child);
#ifdef TIF_SYSCALL_EMU
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
#endif
} }
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION

3
kernel/ptrace.c
View File

@ -118,6 +118,9 @@ void __ptrace_unlink(struct task_struct *child)
BUG_ON(!child->ptrace); BUG_ON(!child->ptrace);
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
#ifdef TIF_SYSCALL_EMU
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
#endif
child->parent = child->real_parent; child->parent = child->real_parent;
list_del_init(&child->ptrace_entry); list_del_init(&child->ptrace_entry);