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libkmod-module: mangle the section header, not the section

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When we are told to remove the "__versions" section we were mangling
that section instead of tweaking the SHF_ALLOC flag in its header.
This commit is contained in:
Lucas De Marchi 2012-11-21 20:17:25 -02:00
parent d196b8d99f
commit a4578669ca
1 changed files with 41 additions and 13 deletions
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54
libkmod/libkmod-elf.c
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@ -375,6 +375,31 @@ const void *kmod_elf_get_memory(const struct kmod_elf *elf)
return elf->memory; return elf->memory;
} }
static int elf_find_section(const struct kmod_elf *elf, const char *section)
{
uint64_t nameslen;
const char *names = elf_get_strings_section(elf, &nameslen);
uint16_t i;
for (i = 1; i < elf->header.section.count; i++) {
uint64_t off, size;
uint32_t nameoff;
const char *n;
int err = elf_get_section_info(elf, i, &off, &size, &nameoff);
if (err < 0)
continue;
if (nameoff >= nameslen)
continue;
n = names + nameoff;
if (!streq(section, n))
continue;
return i;
}
return -ENOENT;
}
int kmod_elf_get_section(const struct kmod_elf *elf, const char *section, const void **buf, uint64_t *buf_size) int kmod_elf_get_section(const struct kmod_elf *elf, const char *section, const void **buf, uint64_t *buf_size)
{ {
uint64_t nameslen; uint64_t nameslen;
@ -550,26 +575,29 @@ int kmod_elf_get_modversions(const struct kmod_elf *elf, struct kmod_modversion
int kmod_elf_strip_section(struct kmod_elf *elf, const char *section) int kmod_elf_strip_section(struct kmod_elf *elf, const char *section)
{ {
uint64_t size, off; uint64_t off, size;
const void *buf; const void *buf;
int err = kmod_elf_get_section(elf, section, &buf, &size); int idx = elf_find_section(elf, section);
if (err < 0) uint64_t val;
return err;
if (idx < 0)
return idx;
buf = elf_get_section_header(elf, idx);
off = (const uint8_t *)buf - elf->memory; off = (const uint8_t *)buf - elf->memory;
#define WRITEV(field, value) \
elf_set_uint(elf, off + offsetof(typeof(*hdr), field), sizeof(hdr->field), value)
if (elf->class & KMOD_ELF_32) { if (elf->class & KMOD_ELF_32) {
const Elf32_Shdr *hdr _unused_ = buf; off += offsetof(Elf32_Shdr, sh_flags);
uint32_t val = ~(uint32_t)SHF_ALLOC; size = sizeof(((Elf32_Shdr *)buf)->sh_flags);
return WRITEV(sh_flags, val);
} else { } else {
const Elf64_Shdr *hdr _unused_ = buf; off += offsetof(Elf64_Shdr, sh_flags);
uint64_t val = ~(uint64_t)SHF_ALLOC; size = sizeof(((Elf64_Shdr *)buf)->sh_flags);
return WRITEV(sh_flags, val);
} }
#undef WRITEV
val = elf_get_uint(elf, off, size);
val &= ~(uint64_t)SHF_ALLOC;
return elf_set_uint(elf, off, size, val);
} }
int kmod_elf_strip_vermagic(struct kmod_elf *elf) int kmod_elf_strip_vermagic(struct kmod_elf *elf)