fdt_string() is used to retrieve strings from a DT blob's strings section.
It's rarely used directly, but is widely used internally.
However, it doesn't do any bounds checking, which means in the case of a
corrupted blob it could access bad memory, which libfdt is supposed to
avoid.
This write a safe alternative to fdt_string, fdt_get_string(). It checks
both that the given offset is within the string section and that the string
it points to is properly \0 terminated within the section. It also returns
the string's length as a convenience (since it needs to determine to do the
checks anyway).
fdt_string() is rewritten in terms of fdt_get_string() for compatibility.
Most of the diff here is actually testing infrastructure.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
The fdt_stringlist_count, fdt_stringslist_search, and fdt_stringlist_get
are added to the libfdt linker script as global symbols
Signed-off-by: Reiner Huober <reiner.huober@nokia.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
fdt_overlay_apply was not usable in the shared library. Export it to allow
its use.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Several functions in the header file were missing from the version.lds
script, meaning that they couldn't be used from a libfdt shared library.
Reported by Ken Aaker, via github issue tracker.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Properties may contain path names which are not NUL-terminated.
For example, the 'stdout-path' property allows the form 'path:options',
where the ':' character terminates the path specifier.
Allow these path names to be used in-place for path descending;
add fdt_path_offset_namelen(), which limits the path name to 'namelen'
characters.
Reimplement fdt_path_offset() as a trivial wrapper.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
The commit 4e76ec7 "libfdt: Add fdt_next_subnode() to permit easy
subnode iteration" adds new functions (fdt_{first,next}_subnode) but
forgot to mark them as 'global' in the shared library.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Some API function symbols were set as 'local' causing linking errors,
now they are set as global (external).
Signed-off-by: Anders Hedlund <anders.hedlund@windriver.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
David Gibson