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userns: Teach trace to use from_kuid

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- When tracing capture the kuid.
- When displaying the data to user space convert the kuid into the
  user namespace of the process that opened the report file.

Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-03-13 16:02:19 -07:00
parent f8f3d4de2d
commit d20b92ab66
3 changed files with 3 additions and 3 deletions
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1
init/Kconfig
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@ -927,7 +927,6 @@ config UIDGID_CONVERTED
# Features
depends on IMA = n
depends on EVM = n
depends on TRACING = n
depends on FS_POSIX_ACL = n
depends on QUOTA = n
depends on QUOTACTL = n

3
kernel/trace/trace.c
View file

@ -2060,7 +2060,8 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
seq_puts(m, "# -----------------\n");
seq_printf(m, "# | task: %.16s-%d "
"(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n",
data->comm, data->pid, data->uid, data->nice,
data->comm, data->pid,
from_kuid_munged(seq_user_ns(m), data->uid), data->nice,
data->policy, data->rt_priority);
seq_puts(m, "# -----------------\n");

2
kernel/trace/trace.h
View file

@ -147,7 +147,7 @@ struct trace_array_cpu {
unsigned long skipped_entries;
cycle_t preempt_timestamp;
pid_t pid;
uid_t uid;
kuid_t uid;
char comm[TASK_COMM_LEN];
};