diff options
Diffstat (limited to 'module/spl/spl-vnode.c')
| -rw-r--r-- | module/spl/spl-vnode.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/module/spl/spl-vnode.c b/module/spl/spl-vnode.c index 12e09b781..77652a5a2 100644 --- a/module/spl/spl-vnode.c +++ b/module/spl/spl-vnode.c @@ -647,9 +647,22 @@ vn_set_pwd(const char *filename) { #ifdef HAVE_2ARGS_SET_FS_PWD struct path path; +#else + struct nameidata nd; +#endif /* HAVE_2ARGS_SET_FS_PWD */ + mm_segment_t saved_fs; int rc; ENTRY; + /* + * user_path_dir() and __user_walk() both expect 'filename' to be + * a user space address so we must briefly increase the data segment + * size to ensure strncpy_from_user() does not fail with -EFAULT. + */ + saved_fs = get_fs(); + set_fs(get_ds()); + +#ifdef HAVE_2ARGS_SET_FS_PWD rc = user_path_dir(filename, &path); if (rc) GOTO(out, rc); @@ -663,10 +676,6 @@ vn_set_pwd(const char *filename) dput_and_out: path_put(&path); #else - struct nameidata nd; - int rc; - ENTRY; - rc = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd); if (rc) @@ -682,6 +691,8 @@ dput_and_out: vn_path_release(&nd); #endif /* HAVE_2ARGS_SET_FS_PWD */ out: + set_fs(saved_fs); + RETURN(-rc); } /* vn_set_pwd() */ EXPORT_SYMBOL(vn_set_pwd); |