diff options
| -rw-r--r-- | fs/proc/proc_sysctl.c | 50 |
1 files changed, 11 insertions, 39 deletions
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index 614c34b..5e31585 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -165,8 +165,8 @@ out: return err; } -static ssize_t proc_sys_read(struct file *filp, char __user *buf, - size_t count, loff_t *ppos) +static ssize_t proc_sys_call_handler(struct file *filp, void __user *buf, + size_t count, loff_t *ppos, int write) { struct dentry *dentry = filp->f_dentry; struct ctl_table_header *head; @@ -190,12 +190,12 @@ static ssize_t proc_sys_read(struct file *filp, char __user *buf, * and won't be until we finish. */ error = -EPERM; - if (sysctl_perm(table, MAY_READ)) + if (sysctl_perm(table, write ? MAY_WRITE : MAY_READ)) goto out; /* careful: calling conventions are nasty here */ res = count; - error = table->proc_handler(table, 0, filp, buf, &res, ppos); + error = table->proc_handler(table, write, filp, buf, &res, ppos); if (!error) error = res; out: @@ -204,44 +204,16 @@ out: return error; } -static ssize_t proc_sys_write(struct file *filp, const char __user *buf, +static ssize_t proc_sys_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { - struct dentry *dentry = filp->f_dentry; - struct ctl_table_header *head; - struct ctl_table *table; - ssize_t error; - size_t res; - - table = do_proc_sys_lookup(dentry->d_parent, &dentry->d_name, &head); - /* Has the sysctl entry disappeared on us? */ - error = -ENOENT; - if (!table) - goto out; - - /* Has the sysctl entry been replaced by a directory? */ - error = -EISDIR; - if (!table->proc_handler) - goto out; - - /* - * At this point we know that the sysctl was not unregistered - * and won't be until we finish. - */ - error = -EPERM; - if (sysctl_perm(table, MAY_WRITE)) - goto out; - - /* careful: calling conventions are nasty here */ - res = count; - error = table->proc_handler(table, 1, filp, (char __user *)buf, - &res, ppos); - if (!error) - error = res; -out: - sysctl_head_finish(head); + return proc_sys_call_handler(filp, (void __user *)buf, count, ppos, 0); +} - return error; +static ssize_t proc_sys_write(struct file *filp, const char __user *buf, + size_t count, loff_t *ppos) +{ + return proc_sys_call_handler(filp, (void __user *)buf, count, ppos, 1); } |
