From 3c17001b21b9f168c957ced9384abe969019b609 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Fri, 12 Sep 2025 13:52:24 +0200 Subject: pidfs: validate extensible ioctls Validate extensible ioctls stricter than we do now. Reviewed-by: Aleksa Sarai Reviewed-by: Jan Kara Signed-off-by: Christian Brauner --- include/linux/fs.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'include/linux/fs.h') diff --git a/include/linux/fs.h b/include/linux/fs.h index d7ab4f96d705..2f2edc53bf3c 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -4023,4 +4023,18 @@ static inline bool vfs_empty_path(int dfd, const char __user *path) int generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter); +static inline bool extensible_ioctl_valid(unsigned int cmd_a, + unsigned int cmd_b, size_t min_size) +{ + if (_IOC_DIR(cmd_a) != _IOC_DIR(cmd_b)) + return false; + if (_IOC_TYPE(cmd_a) != _IOC_TYPE(cmd_b)) + return false; + if (_IOC_NR(cmd_a) != _IOC_NR(cmd_b)) + return false; + if (_IOC_SIZE(cmd_a) < min_size) + return false; + return true; +} + #endif /* _LINUX_FS_H */ -- cgit v1.2.3