A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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x86, bts: add fork and exit handling

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Impact: introduce new ptrace facility

Add arch_ptrace_untrace() function that is called when the tracer
detaches (either voluntarily or when the tracing task dies);
ptrace_disable() is only called on a voluntary detach.

Add ptrace_fork() and arch_ptrace_fork(). They are called when a
traced task is forked.

Clear DS and BTS related fields on fork.

Release DS resources and reclaim memory in ptrace_untrace(). This
releases resources already when the tracing task dies. We used to do
that when the traced task dies.

Signed-off-by: Markus Metzger <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Markus Metzger 2008-12-19 15:10:24 +01:00 • committed by Ingo Molnar
commit bf53de907d
9 changed files with 121 additions and 32 deletions
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12
kernel/ptrace.c
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@ -25,6 +25,17 @@
#include <asm/pgtable.h>
#include <asm/uaccess.h>
/*
* Initialize a new task whose father had been ptraced.
*
* Called from copy_process().
*/
void ptrace_fork(struct task_struct *child, unsigned long clone_flags)
{
arch_ptrace_fork(child, clone_flags);
}
/*
* ptrace a task: make the debugger its new parent and
* move it to the ptrace list.
@ -72,6 +83,7 @@ void __ptrace_unlink(struct task_struct *child)
child->parent = child->real_parent;
list_del_init(&child->ptrace_entry);
arch_ptrace_untrace(child);
if (task_is_traced(child))
ptrace_untrace(child);
}