From 0f6329bd7fcc8952aed5a386617d12529771415d Mon Sep 17 00:00:00 2001 From: Ravi Bangoria Date: Fri, 14 Jul 2017 13:26:27 +0530 Subject: binutils/objdump: Fix disassemble for huge elf sections When elf section size is beyond unsigned int max value, objdump fails to disassemble from that section. Ex on PowerPC, $ objdump -h /proc/kcore Idx Name Size VMA 4 load2 100000000 c000000000000000 Here, size of load2 section is 0x100000000. Also note that, 0xc00.... address range is kernel space for PowerPC. Now let's try to disassemble do_sys_open() using /proc/kcore. $ cat /proc/kallsyms | grep -A1 -w do_sys_open c00000000036c000 T do_sys_open c00000000036c2d0 T SyS_open Before patch: $ objdump -d --start-address=0xc00000000036c000 --stop-address=0xc00000000036c2d0 /proc/kcore /proc/kcore: file format elf64-powerpcle Disassembly of section load2: c00000000036c000 : c00000000036c000: Address 0xc00000000036c000 is out of bounds. Fix this by changing type of 'buffer_length' from unsigned int to size_t. After patch: $ objdump -d --start-address=0xc00000000036c000 --stop-address=0xc00000000036c2d0 /proc/kcore /proc/kcore: file format elf64-powerpcle Disassembly of section load2: c00000000036c000 : c00000000036c000: fc 00 4c 3c addis r2,r12,252 c00000000036c004: 00 53 42 38 addi r2,r2,21248 c00000000036c008: a6 02 08 7c mflr r0 include/ * dis-asm.h (struct disassemble_info): Change type of buffer_length field to size_t. opcodes/ * dis-buf.c (buffer_read_memory): Change type of end_addr_offset, max_addr_offset and octets variables to size_t. --- include/ChangeLog | 5 +++++ include/dis-asm.h | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/ChangeLog b/include/ChangeLog index a726f0d..3203836 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,8 @@ +2017-07-14 Ravi Bangoria + + * dis-asm.h (struct disassemble_info): Change type of buffer_length + field to size_t. + 2017-07-07 John Baldwin * elf/common.h (NT_FREEBSD_PTLWPINFO): Define. diff --git a/include/dis-asm.h b/include/dis-asm.h index 9b42514..4ff8bc9 100644 --- a/include/dis-asm.h +++ b/include/dis-asm.h @@ -158,7 +158,7 @@ typedef struct disassemble_info /* These are for buffer_read_memory. */ bfd_byte *buffer; bfd_vma buffer_vma; - unsigned int buffer_length; + size_t buffer_length; /* This variable may be set by the instruction decoder. It suggests the number of bytes objdump should display on a single line. If -- cgit v1.1