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Fix procfs compat_ioctl regression

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It is important to only provide the compat_ioctl method
if the downstream de->proc_fops does too, otherwise this
utterly confuses the logic in fs/compat_ioctl.c and we
end up doing the wrong thing.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Miller 2007-07-27 22:58:37 -07:00 committed by Linus Torvalds
parent 040b3a2df2
commit 778f3dd5a1
1 changed files with 22 additions and 2 deletions
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24
fs/proc/inode.c
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@ -386,6 +386,19 @@ static const struct file_operations proc_reg_file_ops = {
.release = proc_reg_release, .release = proc_reg_release,
}; };
#ifdef CONFIG_COMPAT
static const struct file_operations proc_reg_file_ops_no_compat = {
.llseek = proc_reg_llseek,
.read = proc_reg_read,
.write = proc_reg_write,
.poll = proc_reg_poll,
.unlocked_ioctl = proc_reg_unlocked_ioctl,
.mmap = proc_reg_mmap,
.open = proc_reg_open,
.release = proc_reg_release,
};
#endif
struct inode *proc_get_inode(struct super_block *sb, unsigned int ino, struct inode *proc_get_inode(struct super_block *sb, unsigned int ino,
struct proc_dir_entry *de) struct proc_dir_entry *de)
{ {
@ -413,8 +426,15 @@ struct inode *proc_get_inode(struct super_block *sb, unsigned int ino,
if (de->proc_iops) if (de->proc_iops)
inode->i_op = de->proc_iops; inode->i_op = de->proc_iops;
if (de->proc_fops) { if (de->proc_fops) {
if (S_ISREG(inode->i_mode)) if (S_ISREG(inode->i_mode)) {
inode->i_fop = &proc_reg_file_ops; #ifdef CONFIG_COMPAT
if (!de->proc_fops->compat_ioctl)
inode->i_fop =
&proc_reg_file_ops_no_compat;
else
#endif
inode->i_fop = &proc_reg_file_ops;
}
else else
inode->i_fop = de->proc_fops; inode->i_fop = de->proc_fops;
} }