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| author | Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> | 2017-07-14 13:26:27 +0530 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2017-07-14 22:51:01 +0930 |
| commit | 0f6329bd7fcc8952aed5a386617d12529771415d (patch) | |
| tree | d65ecc2014d5890e847a89242b84a866901d9ae2 /opcodes | |
| parent | 86038de0d810f8639d22573921d2589a99829b36 (diff) | |
| download | gdb-0f6329bd7fcc8952aed5a386617d12529771415d.zip gdb-0f6329bd7fcc8952aed5a386617d12529771415d.tar.gz gdb-0f6329bd7fcc8952aed5a386617d12529771415d.tar.bz2 | |
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 <load2+0x36c000>:
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 <load2+0x36c000>:
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.
Diffstat (limited to 'opcodes')
| -rw-r--r-- | opcodes/ChangeLog | 5 | ||||
| -rw-r--r-- | opcodes/dis-buf.c | 6 |
2 files changed, 8 insertions, 3 deletions
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog index 855ac35..caeeee7 100644 --- a/opcodes/ChangeLog +++ b/opcodes/ChangeLog @@ -1,3 +1,8 @@ +2017-07-14 Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> + + * dis-buf.c (buffer_read_memory): Change type of end_addr_offset, + max_addr_offset and octets variables to size_t. + 2017-07-12 Alan Modra <amodra@gmail.com> * po/da.po: Update from translationproject.org/latest/opcodes/. diff --git a/opcodes/dis-buf.c b/opcodes/dis-buf.c index 061bc44..fd495bb 100644 --- a/opcodes/dis-buf.c +++ b/opcodes/dis-buf.c @@ -32,9 +32,9 @@ buffer_read_memory (bfd_vma memaddr, struct disassemble_info *info) { unsigned int opb = info->octets_per_byte; - unsigned int end_addr_offset = length / opb; - unsigned int max_addr_offset = info->buffer_length / opb; - unsigned int octets = (memaddr - info->buffer_vma) * opb; + size_t end_addr_offset = length / opb; + size_t max_addr_offset = info->buffer_length / opb; + size_t octets = (memaddr - info->buffer_vma) * opb; if (memaddr < info->buffer_vma || memaddr - info->buffer_vma > max_addr_offset |