diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-10-05 18:43:43 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-10-05 18:43:43 -0400 |
| commit | c5317167854e01dbb42d2291406ab8448d272868 (patch) | |
| tree | 950045759c9f178e35a6bac398bc894c5e32589b | |
| parent | 91fff9b347f9f69025e6557b3279cccedbcc744a (diff) | |
proc: switch auxv to use of __mem_open()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/proc/base.c | 45 |
1 files changed, 26 insertions, 19 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index ac0df4dde823..528c1bb57bc3 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -400,23 +400,6 @@ static const struct file_operations proc_pid_cmdline_ops = { .llseek = generic_file_llseek, }; -static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns, - struct pid *pid, struct task_struct *task) -{ - struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); - if (mm && !IS_ERR(mm)) { - unsigned int nwords = 0; - do { - nwords += 2; - } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ - seq_write(m, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0])); - mmput(mm); - return 0; - } else - return PTR_ERR(mm); -} - - #ifdef CONFIG_KALLSYMS /* * Provides a wchan file via kallsyms in a proper one-value-per-file format. @@ -1014,6 +997,30 @@ static const struct file_operations proc_environ_operations = { .release = mem_release, }; +static int auxv_open(struct inode *inode, struct file *file) +{ + return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS); +} + +static ssize_t auxv_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct mm_struct *mm = file->private_data; + unsigned int nwords = 0; + do { + nwords += 2; + } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ + return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv, + nwords * sizeof(mm->saved_auxv[0])); +} + +static const struct file_operations proc_auxv_operations = { + .open = auxv_open, + .read = auxv_read, + .llseek = generic_file_llseek, + .release = mem_release, +}; + static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { @@ -2822,7 +2829,7 @@ static const struct pid_entry tgid_base_stuff[] = { DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), #endif REG("environ", S_IRUSR, proc_environ_operations), - ONE("auxv", S_IRUSR, proc_pid_auxv), + REG("auxv", S_IRUSR, proc_auxv_operations), ONE("status", S_IRUGO, proc_pid_status), ONE("personality", S_IRUSR, proc_pid_personality), ONE("limits", S_IRUGO, proc_pid_limits), @@ -3210,7 +3217,7 @@ static const struct pid_entry tid_base_stuff[] = { DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), #endif REG("environ", S_IRUSR, proc_environ_operations), - ONE("auxv", S_IRUSR, proc_pid_auxv), + REG("auxv", S_IRUSR, proc_auxv_operations), ONE("status", S_IRUGO, proc_pid_status), ONE("personality", S_IRUSR, proc_pid_personality), ONE("limits", S_IRUGO, proc_pid_limits), |