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ptrace: do not audit capability check when outputing /proc/pid/stat 

Reading /proc/pid/stat of another process checks if one has ptrace permissions
on that process.  If one does have permissions it outputs some data about the
process which might have security and attack implications.  If the current
task does not have ptrace permissions the read still works, but those fields
are filled with inocuous (0) values.  Since this check and a subsequent denial
is not a violation of the security policy we should not audit such denials.

This can be quite useful to removing ptrace broadly across a system without
flooding the logs when ps is run or something which harmlessly walks proc.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com>
This commit is contained in:
Eric Paris 2012-01-03 12:25:15 -05:00
parent f1c84dae0e
commit 69f594a389
4 changed files with 15 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/proc/array.c
View File

@ -380,7 +380,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
state = *get_task_state(task);
vsize = eip = esp = 0;
permitted = ptrace_may_access(task, PTRACE_MODE_READ);
permitted = ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT);
mm = get_task_mm(task);
if (mm) {
vsize = task_vsize(mm);

5
include/linux/ptrace.h
View File

@ -127,8 +127,9 @@ extern void __ptrace_link(struct task_struct *child,
struct task_struct *new_parent);
extern void __ptrace_unlink(struct task_struct *child);
extern void exit_ptrace(struct task_struct *tracer);
#define PTRACE_MODE_READ 1
#define PTRACE_MODE_ATTACH 2
#define PTRACE_MODE_READ 0x01
#define PTRACE_MODE_ATTACH 0x02
#define PTRACE_MODE_NOAUDIT 0x04
/* Returns 0 on success, -errno on denial. */
extern int __ptrace_may_access(struct task_struct *task, unsigned int mode);
/* Returns true on success, false on denial. */

12
kernel/ptrace.c
View File

@ -161,6 +161,14 @@ int ptrace_check_attach(struct task_struct *child, bool ignore_state)
return ret;
}
static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode)
{
if (mode & PTRACE_MODE_NOAUDIT)
return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE);
else
return has_ns_capability(current, ns, CAP_SYS_PTRACE);
}
int __ptrace_may_access(struct task_struct *task, unsigned int mode)
{
const struct cred *cred = current_cred(), *tcred;
@ -187,7 +195,7 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode)
cred->gid == tcred->sgid &&
cred->gid == tcred->gid))
goto ok;
if (ns_capable(tcred->user->user_ns, CAP_SYS_PTRACE))
if (ptrace_has_cap(tcred->user->user_ns, mode))
goto ok;
rcu_read_unlock();
return -EPERM;
@ -196,7 +204,7 @@ ok:
smp_rmb();
if (task->mm)
dumpable = get_dumpable(task->mm);
if (!dumpable && !ns_capable(task_user_ns(task), CAP_SYS_PTRACE))
if (!dumpable && !ptrace_has_cap(task_user_ns(task), mode))
return -EPERM;
return security_ptrace_access_check(task, mode);

2
security/selinux/hooks.c
View File

@ -1809,7 +1809,7 @@ static int selinux_ptrace_access_check(struct task_struct *child,
if (rc)
return rc;
if (mode == PTRACE_MODE_READ) {
if (mode & PTRACE_MODE_READ) {
u32 sid = current_sid();
u32 csid = task_sid(child);
return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL);