diff options
Diffstat (limited to 'include/hw/elf_ops.h')
| -rw-r--r-- | include/hw/elf_ops.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/include/hw/elf_ops.h b/include/hw/elf_ops.h index a172a6068a..2e526d3663 100644 --- a/include/hw/elf_ops.h +++ b/include/hw/elf_ops.h @@ -362,6 +362,54 @@ static int glue(load_elf, SZ)(const char *name, int fd, goto fail; } } + + /* The ELF spec is somewhat vague about the purpose of the + * physical address field. One common use in the embedded world + * is that physical address field specifies the load address + * and the virtual address field specifies the execution address. + * Segments are packed into ROM or flash, and the relocation + * and zero-initialization of data is done at runtime. This + * means that the memsz header represents the runtime size of the + * segment, but the filesz represents the loadtime size. If + * we try to honour the memsz value for an ELF file like this + * we will end up with overlapping segments (which the + * loader.c code will later reject). + * We support ELF files using this scheme by by checking whether + * paddr + memsz for this segment would overlap with any other + * segment. If so, then we assume it's using this scheme and + * truncate the loaded segment to the filesz size. + * If the segment considered as being memsz size doesn't overlap + * then we use memsz for the segment length, to handle ELF files + * which assume that the loader will do the zero-initialization. + */ + if (mem_size > file_size) { + /* If this segment's zero-init portion overlaps another + * segment's data or zero-init portion, then truncate this one. + * Invalid ELF files where the segments overlap even when + * only file_size bytes are loaded will be rejected by + * the ROM overlap check in loader.c, so we don't try to + * explicitly detect those here. + */ + int j; + elf_word zero_start = ph->p_paddr + file_size; + elf_word zero_end = ph->p_paddr + mem_size; + + for (j = 0; j < ehdr.e_phnum; j++) { + struct elf_phdr *jph = &phdr[j]; + + if (i != j && jph->p_type == PT_LOAD) { + elf_word other_start = jph->p_paddr; + elf_word other_end = jph->p_paddr + jph->p_memsz; + + if (!(other_start >= zero_end || + zero_start >= other_end)) { + mem_size = file_size; + break; + } + } + } + } + /* address_offset is hack for kernel images that are linked at the wrong physical address. */ if (translate_fn) { |