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tracehook: tracehook_tracer_task

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This adds the tracehook_tracer_task() hook to consolidate all forms of
"Who is using ptrace on me?" logic.  This is used for "TracerPid:" in
/proc and for permission checks.  We also clean up the selinux code the
called an identical accessor.

Signed-off-by: Roland McGrath <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Reviewed-by: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Roland McGrath 2008-07-25 19:45:49 -07:00 • committed by Linus Torvalds
commit 0d094efeb1
4 changed files with 37 additions and 25 deletions
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9
fs/proc/array.c
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@ -80,6 +80,7 @@
#include <linux/delayacct.h>
#include <linux/seq_file.h>
#include <linux/pid_namespace.h>
#include <linux/tracehook.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
@ -168,8 +169,12 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
rcu_read_lock();
ppid = pid_alive(p) ?
task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
tpid = pid_alive(p) && p->ptrace ?
task_pid_nr_ns(rcu_dereference(p->parent), ns) : 0;
tpid = 0;
if (pid_alive(p)) {
struct task_struct *tracer = tracehook_tracer_task(p);
if (tracer)
tpid = task_pid_nr_ns(tracer, ns);
}
seq_printf(m,
"State:\t%s\n"
"Tgid:\t%d\n"

13
fs/proc/base.c
View file

@ -69,6 +69,7 @@
#include <linux/mount.h>
#include <linux/security.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/cgroup.h>
#include <linux/cpuset.h>
#include <linux/audit.h>
@ -231,10 +232,14 @@ static int check_mem_permission(struct task_struct *task)
* If current is actively ptrace'ing, and would also be
* permitted to freshly attach with ptrace now, permit it.
*/
if (task->parent == current && (task->ptrace & PT_PTRACED) &&
task_is_stopped_or_traced(task) &&
ptrace_may_access(task, PTRACE_MODE_ATTACH))
return 0;
if (task_is_stopped_or_traced(task)) {
int match;
rcu_read_lock();
match = (tracehook_tracer_task(task) == current);
rcu_read_unlock();
if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
return 0;
}
/*
* Noone else is allowed.