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Extra sanity checking on ELF headers: Make sure the bootloader actually

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loaded (or claims to have loaded) everything we need.
This commit is contained in:
bjh21 2001-07-31 22:31:47 +00:00
parent f8e21592da
commit 286faf2070
1 changed files with 7 additions and 1 deletions
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8
sys/ddb/db_elf.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_elf.c,v 1.15 2001/07/31 19:14:18 bjh21 Exp $ */
/* $NetBSD: db_elf.c,v 1.16 2001/07/31 22:31:47 bjh21 Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
@ -150,9 +150,13 @@ db_elf_sym_init(symsize, symtab, esymtab, name)
* Find the first (and, we hope, only) SHT_SYMTAB section in
* the file, and the SHT_STRTAB section that goes with it.
*/
if (elf->e_shoff == 0)
goto badheader;
shp = (Elf_Shdr *)((char *)symtab + elf->e_shoff);
for (i = 0; i < elf->e_shnum; i++) {
if (shp[i].sh_type == SHT_SYMTAB) {
if (shp[i].sh_offset == 0)
continue;
/* Got the symbol table. */
symtab_start = (Elf_Sym *)((char *)symtab +
shp[i].sh_offset);
@ -160,6 +164,8 @@ db_elf_sym_init(symsize, symtab, esymtab, name)
shp[i].sh_offset + shp[i].sh_size);
/* Find the string table to go with it. */
j = shp[i].sh_link;
if (shp[j].sh_offset == 0)
continue;
strtab_start = (char *)symtab + shp[j].sh_offset;
strtab_end = (char *)symtab + shp[j].sh_offset +
shp[j].sh_size;