FC12 libc.so has new EI_OSABI and sym->st_info

[derekbruening]

From [email protected] on January 12, 2010 17:42:36

Two issues show up with Fedora Core 12's /lib/libc.so.6:

1. dr_get_proc_address() returns NULL on strlen

objdump -T /lib/libc.so.6 | grep ' strlen'
00c327b0 g iD .text 00000034 GLIBC_2.0 strlen

The "i" means "a function to be evaluated during reloc processing".
It's ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC instead of STT_FUNC.

elf_sym_matches: considering type=2 strrchr
get_proc_address: strrchr => 0x00c32cc0
elf_sym_matches: considering type=2 strchrnul
get_proc_address: strchrnul => 0x00c35450
elf_sym_matches: considering type=10 strlen
get_proc_address: strlen => 0x00000000

2. ASSERT_CURIOSITY(elf_header.e_ident[EI_OSABI] == ELFOSABI_SYSV)

the e_ident[EI_OSABI} instead has value ELFOSABI_LINUX

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=248

[derekbruening]

From [email protected] on January 13, 2010 16:44:04

fixed in r261

Status: Verified

[derekbruening]

From [email protected] on February 03, 2010 15:42:25

in r269 :

• added dr_get_proc_address_ex() to return additional information about
  a module's export, since clients monitoring routines need to know
  whether an export is direct or indirect

so now a client can call the indirect export to get the real export