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-rw-r--r--fs/devpts/inode.c76
1 files changed, 49 insertions, 27 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index bfb8a230bac..14c5620b5ca 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -18,6 +18,7 @@
#include <linux/mount.h>
#include <linux/tty.h>
#include <linux/devpts_fs.h>
+#include <linux/parser.h>
#define DEVPTS_SUPER_MAGIC 0x1cd1
@@ -32,39 +33,60 @@ static struct {
umode_t mode;
} config = {.mode = 0600};
+enum {
+ Opt_uid, Opt_gid, Opt_mode,
+ Opt_err
+};
+
+static match_table_t tokens = {
+ {Opt_uid, "uid=%u"},
+ {Opt_gid, "gid=%u"},
+ {Opt_mode, "mode=%o"},
+ {Opt_err, NULL}
+};
+
static int devpts_remount(struct super_block *sb, int *flags, char *data)
{
- int setuid = 0;
- int setgid = 0;
- uid_t uid = 0;
- gid_t gid = 0;
- umode_t mode = 0600;
- char *this_char;
-
- this_char = NULL;
- while ((this_char = strsep(&data, ",")) != NULL) {
- int n;
- char dummy;
- if (!*this_char)
+ char *p;
+
+ config.setuid = 0;
+ config.setgid = 0;
+ config.uid = 0;
+ config.gid = 0;
+ config.mode = 0600;
+
+ while ((p = strsep(&data, ",")) != NULL) {
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+ int option;
+
+ if (!*p)
continue;
- if (sscanf(this_char, "uid=%i%c", &n, &dummy) == 1) {
- setuid = 1;
- uid = n;
- } else if (sscanf(this_char, "gid=%i%c", &n, &dummy) == 1) {
- setgid = 1;
- gid = n;
- } else if (sscanf(this_char, "mode=%o%c", &n, &dummy) == 1)
- mode = n & ~S_IFMT;
- else {
- printk("devpts: called with bogus options\n");
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_uid:
+ if (match_int(&args[0], &option))
+ return -EINVAL;
+ config.uid = option;
+ config.setuid = 1;
+ break;
+ case Opt_gid:
+ if (match_int(&args[0], &option))
+ return -EINVAL;
+ config.gid = option;
+ config.setgid = 1;
+ break;
+ case Opt_mode:
+ if (match_octal(&args[0], &option))
+ return -EINVAL;
+ config.mode = option & ~S_IFMT;
+ break;
+ default:
+ printk(KERN_ERR "devpts: called with bogus options\n");
return -EINVAL;
}
}
- config.setuid = setuid;
- config.setgid = setgid;
- config.uid = uid;
- config.gid = gid;
- config.mode = mode;
return 0;
}