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btrfs-progs: receive dump: encode clone path and xattr name/value

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The xattr names are user strings but still can potentially contain
special characters (as reported). There doesn't seem to be a restriction
on the name defined.

The xattr values care length-encoded byte arrays so escaping needs be
done.

The clone source is a path and by mistake lacked the encoding.

Issue: #818
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2024-06-17 22:25:28 +02:00
parent 4db925911c
commit 31286d3b31
1 changed files with 27 additions and 10 deletions
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37
cmds/receive-dump.c
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@ -45,10 +45,9 @@
* Returns the length of the escaped characters. Unprintable characters are
* escaped as octals.
*/
static int print_path_escaped(const char *path)
static int print_path_escaped_len(const char *path, size_t path_len)
{
size_t i;
size_t path_len = strlen(path);
int len = 0;
for (i = 0; i < path_len; i++) {
@ -81,6 +80,11 @@ static int print_path_escaped(const char *path)
return len;
}
static int print_path_escaped(const char *path)
{
return print_path_escaped_len(path, strlen(path));
}
enum print_mode {
PRINT_DUMP_NORMAL,
PRINT_DUMP_SUBVOLUME,
@ -251,24 +255,37 @@ static int print_clone(const char *path, u64 offset, u64 len,
char full_path[PATH_MAX];
int ret;
PATH_CAT_OR_RET("clone", full_path, r->full_subvol_path, clone_path,
ret);
return PRINT_DUMP(user, path, "clone",
"offset=%llu len=%llu from=%s clone_offset=%llu",
offset, len, full_path, clone_offset);
PATH_CAT_OR_RET("clone", full_path, r->full_subvol_path, clone_path, ret);
PRINT_DUMP_NO_NEWLINE(user, path, "clone", "offset=%llu len=%llu from=", offset, len);
print_path_escaped(full_path);
putchar(' ');
printf("clone_offset=%llu\n", clone_offset);
return 0;
}
/*
* Xattr names are like paths and can potentially contain special characters,
* xattr values can be arbitrary.
*/
static int print_set_xattr(const char *path, const char *name,
const void *data, int len, void *user)
{
return PRINT_DUMP(user, path, "set_xattr", "name=%s data=%.*s len=%d",
name, len, (char *)data, len);
PRINT_DUMP_NO_NEWLINE(user, path, "set_xattr", "name=");
print_path_escaped(name);
putchar(' ');
print_path_escaped_len((char *)data, len);
putchar(' ');
printf("len=%d\n", len);
return 0;
}
static int print_remove_xattr(const char *path, const char *name, void *user)
{
return PRINT_DUMP(user, path, "remove_xattr", "name=%s", name);
PRINT_DUMP_NO_NEWLINE(user, path, "remove_xattr", "name=");
print_path_escaped(name);
putchar('\n');
return 0;
}
static int print_truncate(const char *path, u64 size, void *user)