Maynard Johnson writes: > I'm developing a kernel module that needs to parse the in-memory ELF > objects for a shared library (libc, to be specific). When running my > test on a 32-bit library, it works fine, but for a 64-bit library, the > very first copy_from_user() fails: > Elf64_Ehdr ehdr; > copy_from_user(&ehdr, location_of_lib, sizeof(Elf64_Ehdr);
Should be OK provided location_of_lib is a user address. I assume you know that copy_from_user returns the number of bytes *not* copied, hence a 0 return means success. > I talked this over a bit with Will Schmidt. He determined that > access_ok (being done as a result of copy_from_user) was failing, but we I suggest you print out the value of location_of_lib just to sanity-check it. Paul. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
