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proc: clean up /proc/<pid>/environ handling

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Similar to e268337dfe ("proc: clean up and fix /proc/<pid>/mem
handling"), move the check of permission to open(), this will simplify
read() code.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Cong Wang 2012-05-31 16:26:17 -07:00 committed by Linus Torvalds
parent 168eeccbc9
commit b409e578d9
1 changed files with 24 additions and 21 deletions
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45
fs/proc/base.c
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@ -679,7 +679,7 @@ static const struct file_operations proc_single_file_operations = {
.release = single_release,
};
static int mem_open(struct inode* inode, struct file* file)
static int __mem_open(struct inode *inode, struct file *file, unsigned int mode)
{
struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
struct mm_struct *mm;
@ -687,7 +687,7 @@ static int mem_open(struct inode* inode, struct file* file)
if (!task)
return -ESRCH;
mm = mm_access(task, PTRACE_MODE_ATTACH);
mm = mm_access(task, mode);
put_task_struct(task);
if (IS_ERR(mm))
@ -707,6 +707,11 @@ static int mem_open(struct inode* inode, struct file* file)
return 0;
}
static int mem_open(struct inode *inode, struct file *file)
{
return __mem_open(inode, file, PTRACE_MODE_ATTACH);
}
static ssize_t mem_rw(struct file *file, char __user *buf,
size_t count, loff_t *ppos, int write)
{
@ -803,30 +808,29 @@ static const struct file_operations proc_mem_operations = {
.release = mem_release,
};
static int environ_open(struct inode *inode, struct file *file)
{
return __mem_open(inode, file, PTRACE_MODE_READ);
}
static ssize_t environ_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
char *page;
unsigned long src = *ppos;
int ret = -ESRCH;
struct mm_struct *mm;
int ret = 0;
struct mm_struct *mm = file->private_data;
if (!task)
goto out_no_task;
if (!mm)
return 0;
ret = -ENOMEM;
page = (char *)__get_free_page(GFP_TEMPORARY);
if (!page)
goto out;
mm = mm_for_maps(task);
ret = PTR_ERR(mm);
if (!mm || IS_ERR(mm))
goto out_free;
return -ENOMEM;
ret = 0;
if (!atomic_inc_not_zero(&mm->mm_users))
goto free;
while (count > 0) {
int this_len, retval, max_len;
@ -838,7 +842,7 @@ static ssize_t environ_read(struct file *file, char __user *buf,
max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
this_len = (this_len > max_len) ? max_len : this_len;
retval = access_process_vm(task, (mm->env_start + src),
retval = access_remote_vm(mm, (mm->env_start + src),
page, this_len, 0);
if (retval <= 0) {
@ -857,19 +861,18 @@ static ssize_t environ_read(struct file *file, char __user *buf,
count -= retval;
}
*ppos = src;
mmput(mm);
out_free:
free:
free_page((unsigned long) page);
out:
put_task_struct(task);
out_no_task:
return ret;
}
static const struct file_operations proc_environ_operations = {
.open = environ_open,
.read = environ_read,
.llseek = generic_file_llseek,
.release = mem_release,
};
static ssize_t oom_adjust_read(struct file *file, char __user *buf,