Re: [Crash-utility] [PATCH v2 3/3] Automatically detect kernel aslr offset.

+static void +derive_kaslr_offset(bfd *abfd, int dynamic, bfd_byte *start, bfd_byte *end, + unsigned int size, asymbol *store) +{ + symbol_info syminfo; + asymbol *sym; + char *name; + unsigned long relocate; + char buf[BUFSIZE]; + + for (; start < end; start += size) { + sym = bfd_minisymbol_to_symbol(abfd, dynamic, start, store); + if (sym == NULL) + error(FATAL, "bfd_minisymbol_to_symbol() failed\n"); + + bfd_get_symbol_info(abfd, sym, &syminfo); + name = strip_symbol_end(syminfo.name, buf); + if (strcmp("_stext", name) == 0) { + relocate = syminfo.value - kt->vmcoreinfo._stext_SYMBOL; + /* + *To avoid mistaking an mismatched kernel version with + * a kaslr offset, we make sure that the offset is + * aligned by 0x1000, as it always will be for + * kaslr. + */ + if ((relocate & 0xFFF) == 0) { + kt->relocate = relocate; + kt->flags |= RELOC_SET; + } + } + } +}