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proc: switch auxv to use of __mem_open()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-10-05 18:43:43 -04:00
parent 91fff9b347
commit c531716785
1 changed files with 26 additions and 19 deletions
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45
fs/proc/base.c
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@ -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),