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[PATCH] kbuild: check SHT_REL sections

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I found that modpost can not detect section mismatch on mips and i386.  On
mips64, the modpost (with r_info layout fix) can detect it.  The current
modpst only checks SHT_RELA section but I suppose SHT_REL section should be
checked also.  This patch does not contain r_info layout fix.  I'll post an
updated r_info layout fix on next mail.

Check SHT_REL sections as like as SHT_RELA sections to detect section
mismatch.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Atsushi Nemoto 2006-05-20 15:00:26 -07:00 committed by Linus Torvalds
parent 92f63cd000
commit 2c1a51f39d
2 changed files with 49 additions and 20 deletions
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67
scripts/mod/modpost.c
View File

@ -697,29 +697,56 @@ static void check_sec_ref(struct module *mod, const char *modname,
/* Walk through all sections */
for (i = 0; i < hdr->e_shnum; i++) {
Elf_Rela *rela;
Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset;
Elf_Rela *stop = (void*)start + sechdrs[i].sh_size;
const char *name = secstrings + sechdrs[i].sh_name +
strlen(".rela");
const char *name = secstrings + sechdrs[i].sh_name;
const char *secname;
Elf_Rela r;
/* We want to process only relocation sections and not .init */
if (section_ref_ok(name) || (sechdrs[i].sh_type != SHT_RELA))
continue;
for (rela = start; rela < stop; rela++) {
Elf_Rela r;
const char *secname;
r.r_offset = TO_NATIVE(rela->r_offset);
r.r_info = TO_NATIVE(rela->r_info);
r.r_addend = TO_NATIVE(rela->r_addend);
sym = elf->symtab_start + ELF_R_SYM(r.r_info);
/* Skip special sections */
if (sym->st_shndx >= SHN_LORESERVE)
if (sechdrs[i].sh_type == SHT_RELA) {
Elf_Rela *rela;
Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset;
Elf_Rela *stop = (void*)start + sechdrs[i].sh_size;
name += strlen(".rela");
if (section_ref_ok(name))
continue;
secname = secstrings + sechdrs[sym->st_shndx].sh_name;
if (section(secname))
warn_sec_mismatch(modname, name, elf, sym, r);
for (rela = start; rela < stop; rela++) {
r.r_offset = TO_NATIVE(rela->r_offset);
r.r_info = TO_NATIVE(rela->r_info);
r.r_addend = TO_NATIVE(rela->r_addend);
sym = elf->symtab_start + ELF_R_SYM(r.r_info);
/* Skip special sections */
if (sym->st_shndx >= SHN_LORESERVE)
continue;
secname = secstrings +
sechdrs[sym->st_shndx].sh_name;
if (section(secname))
warn_sec_mismatch(modname, name,
elf, sym, r);
}
} else if (sechdrs[i].sh_type == SHT_REL) {
Elf_Rel *rel;
Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset;
Elf_Rel *stop = (void*)start + sechdrs[i].sh_size;
name += strlen(".rel");
if (section_ref_ok(name))
continue;
for (rel = start; rel < stop; rel++) {
r.r_offset = TO_NATIVE(rel->r_offset);
r.r_info = TO_NATIVE(rel->r_info);
r.r_addend = 0;
sym = elf->symtab_start + ELF_R_SYM(r.r_info);
/* Skip special sections */
if (sym->st_shndx >= SHN_LORESERVE)
continue;
secname = secstrings +
sechdrs[sym->st_shndx].sh_name;
if (section(secname))
warn_sec_mismatch(modname, name,
elf, sym, r);
}
}
}
}

2
scripts/mod/modpost.h
View File

@ -21,6 +21,7 @@
#define ELF_ST_BIND ELF32_ST_BIND
#define ELF_ST_TYPE ELF32_ST_TYPE
#define Elf_Rel Elf32_Rel
#define Elf_Rela Elf32_Rela
#define ELF_R_SYM ELF32_R_SYM
#define ELF_R_TYPE ELF32_R_TYPE
@ -34,6 +35,7 @@
#define ELF_ST_BIND ELF64_ST_BIND
#define ELF_ST_TYPE ELF64_ST_TYPE
#define Elf_Rel Elf64_Rel
#define Elf_Rela Elf64_Rela
#define ELF_R_SYM ELF64_R_SYM
#define ELF_R_TYPE ELF64_R_TYPE