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authorAl Viro <viro@zeniv.linux.org.uk>2011-03-23 22:52:50 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-24 00:01:18 +0300
commita9712bc12c40c172e393f85a9b2ba8db4bf59509 (patch)
treec40217e028ae937da7ad94e249e2247191ffcc8f /fs/proc
parent198214a7ee50375fa71a65e518341980cfd4b2f0 (diff)
downloadlinux-a9712bc12c40c172e393f85a9b2ba8db4bf59509.tar.xz
deal with races in /proc/*/{syscall,stack,personality}
All of those are rw-r--r-- and all are broken for suid - if you open a file before the target does suid-root exec, you'll be still able to access it. For personality it's not a big deal, but for syscall and stack it's a real problem. Fix: check that task is tracable for you at the time of read(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c69
1 files changed, 50 insertions, 19 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index bc15df390ec4..7d5bb8b9a4ff 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -347,6 +347,23 @@ static int proc_pid_wchan(struct task_struct *task, char *buffer)
}
#endif /* CONFIG_KALLSYMS */
+static int lock_trace(struct task_struct *task)
+{
+ int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
+ if (err)
+ return err;
+ if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
+ mutex_unlock(&task->signal->cred_guard_mutex);
+ return -EPERM;
+ }
+ return 0;
+}
+
+static void unlock_trace(struct task_struct *task)
+{
+ mutex_unlock(&task->signal->cred_guard_mutex);
+}
+
#ifdef CONFIG_STACKTRACE
#define MAX_STACK_TRACE_DEPTH 64
@@ -356,6 +373,7 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
{
struct stack_trace trace;
unsigned long *entries;
+ int err;
int i;
entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
@@ -366,15 +384,20 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
trace.max_entries = MAX_STACK_TRACE_DEPTH;
trace.entries = entries;
trace.skip = 0;
- save_stack_trace_tsk(task, &trace);
- for (i = 0; i < trace.nr_entries; i++) {
- seq_printf(m, "[<%p>] %pS\n",
- (void *)entries[i], (void *)entries[i]);
+ err = lock_trace(task);
+ if (!err) {
+ save_stack_trace_tsk(task, &trace);
+
+ for (i = 0; i < trace.nr_entries; i++) {
+ seq_printf(m, "[<%p>] %pS\n",
+ (void *)entries[i], (void *)entries[i]);
+ }
+ unlock_trace(task);
}
kfree(entries);
- return 0;
+ return err;
}
#endif
@@ -537,18 +560,22 @@ static int proc_pid_syscall(struct task_struct *task, char *buffer)
{
long nr;
unsigned long args[6], sp, pc;
+ int res = lock_trace(task);
+ if (res)
+ return res;
if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
- return sprintf(buffer, "running\n");
-
- if (nr < 0)
- return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
-
- return sprintf(buffer,
+ res = sprintf(buffer, "running\n");
+ else if (nr < 0)
+ res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
+ else
+ res = sprintf(buffer,
"%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
nr,
args[0], args[1], args[2], args[3], args[4], args[5],
sp, pc);
+ unlock_trace(task);
+ return res;
}
#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
@@ -2775,8 +2802,12 @@ static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
- seq_printf(m, "%08x\n", task->personality);
- return 0;
+ int err = lock_trace(task);
+ if (!err) {
+ seq_printf(m, "%08x\n", task->personality);
+ unlock_trace(task);
+ }
+ return err;
}
/*
@@ -2795,7 +2826,7 @@ static const struct pid_entry tgid_base_stuff[] = {
REG("environ", S_IRUSR, proc_environ_operations),
INF("auxv", S_IRUSR, proc_pid_auxv),
ONE("status", S_IRUGO, proc_pid_status),
- ONE("personality", S_IRUSR, proc_pid_personality),
+ ONE("personality", S_IRUGO, proc_pid_personality),
INF("limits", S_IRUGO, proc_pid_limits),
#ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
@@ -2805,7 +2836,7 @@ static const struct pid_entry tgid_base_stuff[] = {
#endif
REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
- INF("syscall", S_IRUSR, proc_pid_syscall),
+ INF("syscall", S_IRUGO, proc_pid_syscall),
#endif
INF("cmdline", S_IRUGO, proc_pid_cmdline),
ONE("stat", S_IRUGO, proc_tgid_stat),
@@ -2833,7 +2864,7 @@ static const struct pid_entry tgid_base_stuff[] = {
INF("wchan", S_IRUGO, proc_pid_wchan),
#endif
#ifdef CONFIG_STACKTRACE
- ONE("stack", S_IRUSR, proc_pid_stack),
+ ONE("stack", S_IRUGO, proc_pid_stack),
#endif
#ifdef CONFIG_SCHEDSTATS
INF("schedstat", S_IRUGO, proc_pid_schedstat),
@@ -3135,14 +3166,14 @@ static const struct pid_entry tid_base_stuff[] = {
REG("environ", S_IRUSR, proc_environ_operations),
INF("auxv", S_IRUSR, proc_pid_auxv),
ONE("status", S_IRUGO, proc_pid_status),
- ONE("personality", S_IRUSR, proc_pid_personality),
+ ONE("personality", S_IRUGO, proc_pid_personality),
INF("limits", S_IRUGO, proc_pid_limits),
#ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
#endif
REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
- INF("syscall", S_IRUSR, proc_pid_syscall),
+ INF("syscall", S_IRUGO, proc_pid_syscall),
#endif
INF("cmdline", S_IRUGO, proc_pid_cmdline),
ONE("stat", S_IRUGO, proc_tid_stat),
@@ -3169,7 +3200,7 @@ static const struct pid_entry tid_base_stuff[] = {
INF("wchan", S_IRUGO, proc_pid_wchan),
#endif
#ifdef CONFIG_STACKTRACE
- ONE("stack", S_IRUSR, proc_pid_stack),
+ ONE("stack", S_IRUGO, proc_pid_stack),
#endif
#ifdef CONFIG_SCHEDSTATS
INF("schedstat", S_IRUGO, proc_pid_schedstat),