The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
63d5429f68a3 ("btrfs: replace strncpy() with strscpy()") cb3e217bdb39 ("btrfs: use btrfs_dev_name() helper to handle missing devices better") 947a629988f1 ("btrfs: move tree block parentness check into validate_extent_buffer()") 789d6a3a876e ("btrfs: concentrate all tree block parentness check parameters into one structure") ab2072b2921e ("btrfs: change how submit bio callback is passed to btrfs_wq_submit_bio") 7920b773bd8a ("btrfs: drop parameter compression_type from btrfs_submit_dio_repair_bio") 19af6a7d345a ("btrfs: change how repair action is passed to btrfs_repair_one_sector") a2c8d27e5ee8 ("btrfs: use a structure to pass arguments to backref walking functions") 6ce6ba534418 ("btrfs: use a single argument for extent offset in backref walking functions") 22a3c0ac8ed0 ("btrfs: send: avoid unnecessary backref lookups when finding clone source") 2885fd632050 ("btrfs: move inode prototypes to btrfs_inode.h") b31bed170d52 ("btrfs: move btrfs_chunk_item_size out of ctree.h") 911bd75aca73 ("btrfs: remove unused function prototypes") a56159d4080b ("btrfs: move btrfs_fs_info declarations into fs.h") 6db75318823a ("btrfs: use struct fscrypt_str instead of struct qstr") ab3c5c18e8fa ("btrfs: setup qstr from dentrys using fscrypt helper") e43eec81c516 ("btrfs: use struct qstr instead of name and namelen pairs") e9c83077d2be ("btrfs: remove temporary btrfs_map_token declaration in ctree.h") ad1ac5012c2b ("btrfs: move btrfs_map_token to accessors") d83eb482b727 ("btrfs: move the compat/incompat flag masks to fs.h")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 63d5429f68a3d4c4aa27e65a05196c17f86c41d6 Mon Sep 17 00:00:00 2001 From: Artem Chernyshev artem.chernyshev@red-soft.ru Date: Sat, 19 Nov 2022 11:13:29 +0300 Subject: [PATCH] btrfs: replace strncpy() with strscpy()
Using strncpy() on NUL-terminated strings are deprecated. To avoid possible forming of non-terminated string strscpy() should be used.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
CC: stable@vger.kernel.org # 4.9+ Signed-off-by: Artem Chernyshev artem.chernyshev@red-soft.ru Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index bed74a3ff574..4fd6b61b06a4 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2859,13 +2859,10 @@ static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, di_args->bytes_used = btrfs_device_get_bytes_used(dev); di_args->total_bytes = btrfs_device_get_total_bytes(dev); memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); - if (dev->name) { - strncpy(di_args->path, btrfs_dev_name(dev), - sizeof(di_args->path) - 1); - di_args->path[sizeof(di_args->path) - 1] = 0; - } else { + if (dev->name) + strscpy(di_args->path, btrfs_dev_name(dev), sizeof(di_args->path)); + else di_args->path[0] = '\0'; - }
out: rcu_read_unlock(); diff --git a/fs/btrfs/rcu-string.h b/fs/btrfs/rcu-string.h index 5c1a617eb25d..5c2b66d155ef 100644 --- a/fs/btrfs/rcu-string.h +++ b/fs/btrfs/rcu-string.h @@ -18,7 +18,11 @@ static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask) (len * sizeof(char)), mask); if (!ret) return ret; - strncpy(ret->str, src, len); + /* Warn if the source got unexpectedly truncated. */ + if (WARN_ON(strscpy(ret->str, src, len) < 0)) { + kfree(ret); + return NULL; + } return ret; }