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--- libelf/elf_update.c.orig 2020-03-30 12:17:45 UTC
+++ libelf/elf_update.c
@@ -106,9 +106,13 @@ write_file (Elf *elf, int64_t size, int change_bo, siz
if (elf->cmd == ELF_C_RDWR_MMAP
&& (size_t) size > elf->maximum_size)
{
- if (mremap (elf->map_address, elf->maximum_size,
- size, 0) == MAP_FAILED)
+ if (munmap (elf->map_address, elf->maximum_size) != 0 ||
+ mmap (elf->map_address, size, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_FIXED | MAP_EXCL, elf->fildes,
+ 0) == MAP_FAILED)
{
+ elf->map_address = NULL;
+ elf->flags &= ~ELF_F_MMAPPED;
__libelf_seterrno (ELF_E_WRITE_ERROR);
return -1;
}
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