diff options
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/base.c | 22 | ||||
| -rw-r--r-- | fs/proc/inode.c | 10 |
2 files changed, 13 insertions, 19 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 6a803a0b75df..b6ccb6c57706 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -407,7 +407,6 @@ static void unlock_trace(struct task_struct *task) static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { - struct stack_trace trace; unsigned long *entries; int err; @@ -430,20 +429,17 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, if (!entries) return -ENOMEM; - trace.nr_entries = 0; - trace.max_entries = MAX_STACK_TRACE_DEPTH; - trace.entries = entries; - trace.skip = 0; - err = lock_trace(task); if (!err) { - unsigned int i; + unsigned int i, nr_entries; - save_stack_trace_tsk(task, &trace); + nr_entries = stack_trace_save_tsk(task, entries, + MAX_STACK_TRACE_DEPTH, 0); - for (i = 0; i < trace.nr_entries; i++) { + for (i = 0; i < nr_entries; i++) { seq_printf(m, "[<0>] %pB\n", (void *)entries[i]); } + unlock_trace(task); } kfree(entries); @@ -489,10 +485,9 @@ static int lstats_show_proc(struct seq_file *m, void *v) lr->count, lr->time, lr->max); for (q = 0; q < LT_BACKTRACEDEPTH; q++) { unsigned long bt = lr->backtrace[q]; + if (!bt) break; - if (bt == ULONG_MAX) - break; seq_printf(m, " %ps", (void *)bt); } seq_putc(m, '\n'); @@ -2540,6 +2535,11 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, rcu_read_unlock(); return -EACCES; } + /* Prevent changes to overridden credentials. */ + if (current_cred() != current_real_cred()) { + rcu_read_unlock(); + return -EBUSY; + } rcu_read_unlock(); if (count > PAGE_SIZE) diff --git a/fs/proc/inode.c b/fs/proc/inode.c index fc7e38def174..5f8d215b3fd0 100644 --- a/fs/proc/inode.c +++ b/fs/proc/inode.c @@ -72,17 +72,11 @@ static struct inode *proc_alloc_inode(struct super_block *sb) return &ei->vfs_inode; } -static void proc_i_callback(struct rcu_head *head) +static void proc_free_inode(struct inode *inode) { - struct inode *inode = container_of(head, struct inode, i_rcu); kmem_cache_free(proc_inode_cachep, PROC_I(inode)); } -static void proc_destroy_inode(struct inode *inode) -{ - call_rcu(&inode->i_rcu, proc_i_callback); -} - static void init_once(void *foo) { struct proc_inode *ei = (struct proc_inode *) foo; @@ -123,7 +117,7 @@ static int proc_show_options(struct seq_file *seq, struct dentry *root) const struct super_operations proc_sops = { .alloc_inode = proc_alloc_inode, - .destroy_inode = proc_destroy_inode, + .free_inode = proc_free_inode, .drop_inode = generic_delete_inode, .evict_inode = proc_evict_inode, .statfs = simple_statfs, |