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authorSimon Kagstrom <simon.kagstrom@netinsight.net>2009-09-15 09:53:29 +0200
committerStefan Roese <sr@denx.de>2009-09-23 15:58:05 +0200
commit9d7952e4c636b8c99289a44dbe28c6f93c43b9f7 (patch)
treee74ed14a35bf0f7ed648e79e5b01618d453a4f3f /fs/ubifs
parent3b6a9267f0de7b85d387fa4123d0b58379363447 (diff)
downloadu-boot-linaro-stable-9d7952e4c636b8c99289a44dbe28c6f93c43b9f7.tar.gz
ubifs: Add support for looking up directory and relative symlinks
This patch adds support for resolving symlinks to directories as well as relative symlinks. Symlinks are now always resolved during file lookup, so the load stage no longer needs to special-case them. Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net> Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'fs/ubifs')
-rw-r--r--fs/ubifs/ubifs.c68
1 files changed, 43 insertions, 25 deletions
diff --git a/fs/ubifs/ubifs.c b/fs/ubifs/ubifs.c
index 8ede188e1..b03ed0bb8 100644
--- a/fs/ubifs/ubifs.c
+++ b/fs/ubifs/ubifs.c
@@ -379,9 +379,11 @@ static unsigned long ubifs_findfile(struct super_block *sb, char *filename)
int ret;
char *next;
char fpath[128];
+ char symlinkpath[128];
char *name = fpath;
unsigned long root_inum = 1;
unsigned long inum;
+ int symlink_count = 0; /* Don't allow symlink recursion */
strcpy(fpath, filename);
@@ -397,6 +399,9 @@ static unsigned long ubifs_findfile(struct super_block *sb, char *filename)
return inum;
for (;;) {
+ struct inode *inode;
+ struct ubifs_inode *ui;
+
/* Extract the actual part from the pathname. */
next = strchr(name, '/');
if (next) {
@@ -406,18 +411,48 @@ static unsigned long ubifs_findfile(struct super_block *sb, char *filename)
}
ret = ubifs_finddir(sb, name, root_inum, &inum);
+ if (!ret)
+ return 0;
+ inode = ubifs_iget(sb, inum);
+
+ if (!inode)
+ return 0;
+ ui = ubifs_inode(inode);
+
+ if ((inode->i_mode & S_IFMT) == S_IFLNK) {
+ char link_name[64];
+ char buf[128];
+
+ /* We have some sort of symlink recursion, bail out */
+ if (symlink_count++ > 8) {
+ printf("Symlink recursion, aborting\n");
+ return 0;
+ }
+ memcpy(link_name, ui->data, ui->data_len);
+ link_name[ui->data_len] = '\0';
+
+ if (link_name[0] == '/') {
+ /* Absolute path, redo everything without
+ * the leading slash */
+ next = name = link_name + 1;
+ root_inum = 1;
+ continue;
+ }
+ /* Relative to cur dir */
+ sprintf(buf, "%s%s",
+ link_name, next == NULL ? "" : next);
+ memcpy(symlinkpath, buf, sizeof(buf));
+ next = name = symlinkpath;
+ continue;
+ }
/*
* Check if directory with this name exists
*/
/* Found the node! */
- if (!next || *next == '\0') {
- if (ret)
- return inum;
-
- break;
- }
+ if (!next || *next == '\0')
+ return inum;
root_inum = inum;
name = next;
@@ -614,10 +649,10 @@ int ubifs_load(char *filename, u32 addr, u32 size)
int err = 0;
int i;
int count;
- char link_name[64];
- struct ubifs_inode *ui;
c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
+ /* ubifs_findfile will resolve symlinks, so we know that we get
+ * the real file here */
inum = ubifs_findfile(ubifs_sb, filename);
if (!inum) {
err = -1;
@@ -635,23 +670,6 @@ int ubifs_load(char *filename, u32 addr, u32 size)
}
/*
- * Check for symbolic link
- */
- ui = ubifs_inode(inode);
- if (((inode->i_mode & S_IFMT) == S_IFLNK) && ui->data_len) {
- memcpy(link_name, ui->data, ui->data_len);
- link_name[ui->data_len] = '\0';
- printf("%s is linked to %s!\n", filename, link_name);
- ubifs_iput(inode);
-
- /*
- * Now we have the "real" filename, call ubifs_load()
- * again (recursive call) to load this file instead
- */
- return ubifs_load(link_name, addr, size);
- }
-
- /*
* If no size was specified or if size bigger than filesize
* set size to filesize
*/