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Relocation offset checks were completely missing in the rl78 backend, allowing a relocation to write over memory anywhere. This was true for rl78_special_reloc, a function primarily used when applying debug relocations, and in rl78_elf_relocate_section used by the linker. This patch fixes those problems by correcting inaccuracies in the relocation howtos, then uses those howtos to sanity check relocation offsets before applying relocations. In addition, the patch implements overflow checking using the howto information rather than the ad-hoc scheme implemented in relocate_section. I implemented the overflow checking in rl78_special_reloc too. * elf32-rl78.c (RL78REL, RL78_OP_REL): Add mask parameter. (rl78_elf_howto_table): Set destination masks. Correct size and bitsize of DIR32_REV. Correct complain_on_overflow for many relocs as per tests in relocate_section. Add RH_SFR. Correct bitsize for RH_SADDR. Set size to 3 and bitsize to 0 for all OP relocs. (check_overflow): New function. (rl78_special_reloc): Check that reloc address is within section. Apply relocations using reloc howto. Check for overflow. (RANGE): Delete. (rl78_elf_relocate_section): Sanity check r_offset. Perform overflow checking using reloc howto.
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.