https://sourceware.org/bugzilla/show_bug.cgi?id=18201
Bug ID: 18201
Summary: Incorrect ELF generated when .text is below 0x200000
Product: binutils
Version: 2.24
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: bijuabrahamp at gmail dot com
OS: Ubuntu 14.04, Fedora 21
ARCH : x86_64
Perform steps below to generate the incorrect ELF.
$ cat test.c
int main()
{
int x = 3;
/* do something */
asm volatile("mov $60,%rax; mov $0,%rbx; syscall");
}
$ cat mylinker.lds
SECTIONS
{
. = 0x100000;
.text : { *(.text) }
. = 0x8000000;
.data : { *(.data) }
.bss : { *(.bss) }
}
$ gcc -c test.c
$ ld -T mylinker.lds test.o -o test
$ readelf -l test
Elf file type is EXEC (Executable file)
Entry point 0x100000
There are 2 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000100060 0x0000000000100060 R E 200000
GNU_STACK 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 RW 10
Expected output :
LOAD 0x0000000000100000 0x0000000000100000 0x0000000000000000
0x0000000000000060 0x0000000000000060 R E 200000
$ ./test
Killed
(Address 0 cannot be used by unprevileged users because of Linux kernel's
mmap_min_addr)
Manually fixing up the ELF file using hex editor or some utilty resolves the
issue.
$ git clone https://github.com/bjxt/elf_fixup
$ cd elf_fixup
$ ./fixelf -e test -o 0x100000 -f 0x60 -v 0x100000 -m 0x60
$ ./test
Program completes successfully.
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