From 778f3dd5a13c9e1642e0b2efea4b769387a70afa Mon Sep 17 00:00:00 2001 From: David Miller Date: Fri, 27 Jul 2007 22:58:37 -0700 Subject: [PATCH] Fix procfs compat_ioctl regression 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 Acked-by: Alexey Dobriyan Signed-off-by: Linus Torvalds --- fs/proc/inode.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/fs/proc/inode.c b/fs/proc/inode.c index 94e2c1adf1..a5b0dfd89a 100644 --- a/fs/proc/inode.c +++ b/fs/proc/inode.c @@ -386,6 +386,19 @@ static const struct file_operations proc_reg_file_ops = { .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 proc_dir_entry *de) { @@ -413,8 +426,15 @@ struct inode *proc_get_inode(struct super_block *sb, unsigned int ino, if (de->proc_iops) inode->i_op = de->proc_iops; if (de->proc_fops) { - if (S_ISREG(inode->i_mode)) - inode->i_fop = &proc_reg_file_ops; + if (S_ISREG(inode->i_mode)) { +#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 inode->i_fop = de->proc_fops; } -- 2.39.5