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| author | Justin Stitt <justinstitt@google.com> | 2024-03-23 00:41:18 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-04-09 11:52:13 +0300 |
| commit | 629171657a2864d819a3bbecabe0a5e001d05c7a (patch) | |
| tree | 75919a459847e83887d934f73af0f32773b05dc3 /fs/orangefs/super.c | |
| parent | c473bcdd80d4ab2ae79a7a509a6712818366e32a (diff) | |
| download | linux-629171657a2864d819a3bbecabe0a5e001d05c7a.tar.xz | |
orangefs: cleanup uses of strncpy
strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.
There is some care taken to ensure these destination buffers are
NUL-terminated by bounding the strncpy()'s by ORANGEFS_NAME_MAX - 1 or
ORANGEFS_MAX_SERVER_ADDR_LEN - 1. Instead, we can use the new 2-argument
version of strscpy() to guarantee NUL-termination on the destination
buffers while simplifying the code.
Based on usage with printf-likes, we can see these buffers are expected
to be NUL-terminated:
| gossip_debug(GOSSIP_NAME_DEBUG,
| "%s: doing lookup on %s under %pU,%d\n",
| __func__,
| new_op->upcall.req.lookup.d_name,
| &new_op->upcall.req.lookup.parent_refn.khandle,
| new_op->upcall.req.lookup.parent_refn.fs_id);
...
| gossip_debug(GOSSIP_SUPER_DEBUG,
| "Attempting ORANGEFS Remount via host %s\n",
| new_op->upcall.req.fs_mount.orangefs_config_server);
NUL-padding isn't required for any of these destination buffers as
they've all been zero-allocated with op_alloc() or kzalloc().
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/20240322-strncpy-fs-orangefs-dcache-c-v1-1-15d12debbf38@google.com
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/orangefs/super.c')
| -rw-r--r-- | fs/orangefs/super.c | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c index 34849b4a3243..fb4d09c2f531 100644 --- a/fs/orangefs/super.c +++ b/fs/orangefs/super.c @@ -253,9 +253,8 @@ int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb) new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT); if (!new_op) return -ENOMEM; - strncpy(new_op->upcall.req.fs_mount.orangefs_config_server, - orangefs_sb->devname, - ORANGEFS_MAX_SERVER_ADDR_LEN); + strscpy(new_op->upcall.req.fs_mount.orangefs_config_server, + orangefs_sb->devname); gossip_debug(GOSSIP_SUPER_DEBUG, "Attempting ORANGEFS Remount via host %s\n", @@ -400,8 +399,7 @@ static int orangefs_unmount(int id, __s32 fs_id, const char *devname) return -ENOMEM; op->upcall.req.fs_umount.id = id; op->upcall.req.fs_umount.fs_id = fs_id; - strncpy(op->upcall.req.fs_umount.orangefs_config_server, - devname, ORANGEFS_MAX_SERVER_ADDR_LEN - 1); + strscpy(op->upcall.req.fs_umount.orangefs_config_server, devname); r = service_operation(op, "orangefs_fs_umount", 0); /* Not much to do about an error here. */ if (r) @@ -494,9 +492,7 @@ struct dentry *orangefs_mount(struct file_system_type *fst, if (!new_op) return ERR_PTR(-ENOMEM); - strncpy(new_op->upcall.req.fs_mount.orangefs_config_server, - devname, - ORANGEFS_MAX_SERVER_ADDR_LEN - 1); + strscpy(new_op->upcall.req.fs_mount.orangefs_config_server, devname); gossip_debug(GOSSIP_SUPER_DEBUG, "Attempting ORANGEFS Mount via host %s\n", @@ -543,9 +539,8 @@ struct dentry *orangefs_mount(struct file_system_type *fst, * on successful mount, store the devname and data * used */ - strncpy(ORANGEFS_SB(sb)->devname, - devname, - ORANGEFS_MAX_SERVER_ADDR_LEN - 1); + strscpy(ORANGEFS_SB(sb)->devname, devname); + /* mount_pending must be cleared */ ORANGEFS_SB(sb)->mount_pending = 0; |