------- Additional Comments From hjl dot tools at gmail dot com 2008-03-08
23:40 -------
>From gABI:
sh_size Unspecified If non-zero, the actual number of section header entries
sh_link Unspecified If non-zero, the index of the section header string table
section
sh_link has a section index, which can be > number of sections. Consider
bash-3.2$ cat y.c
int conststaticvariable;
bash-3.2$ gcc -c y.c -m32
bash-3.2$ readelf -Ss y.o
There are 9 section headers, starting at offset 0xa8:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .text PROGBITS 00000000 000034 000000 00 AX 0 0 4
[ 2] .data PROGBITS 00000000 000034 000000 00 WA 0 0 4
[ 3] .bss NOBITS 00000000 000034 000000 00 WA 0 0 4
[ 4] .comment PROGBITS 00000000 000034 00002e 00 0 0 1
[ 5] .note.GNU-stack PROGBITS 00000000 000062 000000 00 0 0 1
[ 6] .shstrtab STRTAB 00000000 000062 000045 00 0 0 1
[ 7] .symtab SYMTAB 00000000 000210 000080 10 8 7 4
[ 8] .strtab STRTAB 00000000 000290 000019 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
Symbol table '.symtab' contains 8 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000 0 FILE LOCAL DEFAULT ABS y.c
2: 00000000 0 SECTION LOCAL DEFAULT 1
3: 00000000 0 SECTION LOCAL DEFAULT 2
4: 00000000 0 SECTION LOCAL DEFAULT 3
5: 00000000 0 SECTION LOCAL DEFAULT 5
6: 00000000 0 SECTION LOCAL DEFAULT 4
7: 00000004 4 OBJECT GLOBAL DEFAULT COM conststaticvariable
bash-3.2$
y.o only have 9 sections. However, the section index of conststaticvariable
is 0xfff2, which is > 9. That is because the section indexes from 0xfff2
to 0xfff2 don't have entries in section header table. st_shndx is section
index, which isn't the same as the index of the section header table.
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl dot tools at gmail dot
| |com
http://sourceware.org/bugzilla/show_bug.cgi?id=5900
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