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dtc/libfdt

History

David Gibson 812b1956a0 libfdt: Tweak data handling to satisfy Coverity ... In libfdt we often sanity test fdt_totalsize(fdt) fairly early, then trust it (but *only* that header field) for the remainder of our work. However, Coverity gets confused by this - it sees the byteswap in fdt32_ld() and assumes that means it is coming from an untrusted source everytime, resulting in many tainted data warnings. Most of these end up with logic in fdt_get_string() as the unsafe destination for this tainted data, so let's tweak the logic there to make it clearer to Coverity that this is ok. We add a sanity test on fdt_totalsize() to fdt_probe_ro_(). Because the interface allows bare ints to be used for offsets, we already have the assumption that totalsize must be 31-bits or less (2GiB would be a ludicrously large fdt). This makes this more explicit. We also make fdt_probe_ro() return the size for convenience, and change the logic in fdt_get_string() to keep it in a local so that Coverity can see that it has already been bounds-checked. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>		6 years ago
..
.gitignore	…
Makefile.libfdt	libfdt: Add dual GPL/BSD SPDX tags to files missing license text	6 years ago
TODO	…
fdt.c	libfdt: Tweak data handling to satisfy Coverity	6 years ago
fdt.h	libfdt: Replace GPL/BSD boilerplate/reference with SPDX tags	6 years ago
fdt_addresses.c	libfdt: Replace GPL/BSD boilerplate/reference with SPDX tags	6 years ago
fdt_empty_tree.c	libfdt: Replace GPL/BSD boilerplate/reference with SPDX tags	6 years ago
fdt_overlay.c	fdtoverlay: Ignore symbols in overlays which don't apply to the target tree	6 years ago
fdt_ro.c	libfdt: Tweak data handling to satisfy Coverity	6 years ago
fdt_rw.c	libfdt: Replace GPL/BSD boilerplate/reference with SPDX tags	6 years ago
fdt_strerror.c	libfdt: Replace GPL/BSD boilerplate/reference with SPDX tags	6 years ago
fdt_sw.c	libfdt: Replace GPL/BSD boilerplate/reference with SPDX tags	6 years ago
fdt_wip.c	libfdt: Replace GPL/BSD boilerplate/reference with SPDX tags	6 years ago
libfdt.h	libfdt: Replace GPL/BSD boilerplate/reference with SPDX tags	6 years ago
libfdt_env.h	libfdt: Replace GPL/BSD boilerplate/reference with SPDX tags	6 years ago
libfdt_internal.h	libfdt: Tweak data handling to satisfy Coverity	6 years ago
version.lds	libfdt: Add dual GPL/BSD SPDX tags to files missing license text	6 years ago