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While ELF_C_RDWR_MMAP was used, elf_begin invoked mmap() to map file into memory. While the file's bss Offset has a large number, elf_update caculated file size by __elf64_updatenull_wrlock and the size was enlarged. In this situation, elf_update invoked ftruncate to enlarge the file, and memory size (elf->maximum_size) also was incorrectly updated. There was segment fault in elf_end which invoked munmap with the length is the enlarged file size, not the mmap's length. Before the above operations, invoke elf_begin/elf_update/elf_end with ELF_C_RDWR and ELF_F_LAYOUT set to enlarge the above file, it could make sure the file is safe for the following elf operations. [YOCTO #5356] https://bugzilla.redhat.com/show_bug.cgi?id=1019707 https://bugzilla.redhat.com/show_bug.cgi?id=1020842 (From OE-Core rev: 35c8b1ac7c3b1e4209b1e30d1dbd1a457286b97b) Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>