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Diffstat (limited to 'scripts/mod')
-rw-r--r--scripts/mod/modpost.c33
1 files changed, 21 insertions, 12 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 65bdfdb5687..1912c752e42 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -333,10 +333,10 @@ void release_file(void *file, unsigned long size)
munmap(file, size);
}
-static void parse_elf(struct elf_info *info, const char *filename)
+static int parse_elf(struct elf_info *info, const char *filename)
{
unsigned int i;
- Elf_Ehdr *hdr = info->hdr;
+ Elf_Ehdr *hdr;
Elf_Shdr *sechdrs;
Elf_Sym *sym;
@@ -346,9 +346,18 @@ static void parse_elf(struct elf_info *info, const char *filename)
exit(1);
}
info->hdr = hdr;
- if (info->size < sizeof(*hdr))
- goto truncated;
-
+ if (info->size < sizeof(*hdr)) {
+ /* file too small, assume this is an empty .o file */
+ return 0;
+ }
+ /* Is this a valid ELF file? */
+ if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
+ (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
+ (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
+ (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
+ /* Not an ELF file - silently ignore it */
+ return 0;
+ }
/* Fix endianness in ELF header */
hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
@@ -371,8 +380,10 @@ static void parse_elf(struct elf_info *info, const char *filename)
= (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
const char *secname;
- if (sechdrs[i].sh_offset > info->size)
- goto truncated;
+ if (sechdrs[i].sh_offset > info->size) {
+ fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr));
+ return 0;
+ }
secname = secstrings + sechdrs[i].sh_name;
if (strcmp(secname, ".modinfo") == 0) {
info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
@@ -407,10 +418,7 @@ static void parse_elf(struct elf_info *info, const char *filename)
sym->st_value = TO_NATIVE(sym->st_value);
sym->st_size = TO_NATIVE(sym->st_size);
}
- return;
-
- truncated:
- fatal("%s is truncated.\n", filename);
+ return 1;
}
static void parse_elf_finish(struct elf_info *info)
@@ -1089,7 +1097,8 @@ static void read_symbols(char *modname)
struct elf_info info = { };
Elf_Sym *sym;
- parse_elf(&info, modname);
+ if (!parse_elf(&info, modname))
+ return;
mod = new_module(modname);