I ran into a problem today working with a recent glibc on a PowerPC system. It
had GNU_HASH enabled. When I attempted to prelink it, I got a floating point
error.. (actually it was a divide by zero).
The prelinker found a GNU_HASH section, and attempted to call elf32_xlatetof on
that. The fsize table was missing the an entry for the ELF_T_GNUHASH. The
start of the xlatetof does a count % size != 0 -- error to detect an alignment
problem. This triggered a divide by zero.
Attached is the patch I came up with to address this problem. This is against
0.148. Let me know if there are any questions, I'm not subscribed to the list.
In the process I noticed that both ELF_T_LIB and ELF_T_GNUHASH were missing, so
I attempted to add them. I'm not completely sure that I have the right sizes,
so someone more knowledgeable in elf will need to verify the sizes are correct.
--Mark
The ELF_T_LIB and ELF_T_GNUHASH sizes were missing from fsize table.
This could cause a failure in the elf*_xlatetof function.
diff -ur elfutils-0.148.orig/libelf/exttypes.h elfutils-0.148/libelf/exttypes.h
--- elfutils-0.148.orig/libelf/exttypes.h 2009-01-08 12:56:37.000000000
-0800
+++ elfutils-0.148/libelf/exttypes.h 2010-08-18 14:00:33.000000000 -0700
@@ -94,6 +94,7 @@
Vernaux32 (Ext_);
Syminfo32 (Ext_);
Move32 (Ext_);
+Lib32 (Ext_);
auxv_t32 (Ext_);
Ehdr64 (Ext_);
@@ -110,6 +111,7 @@
Vernaux64 (Ext_);
Syminfo64 (Ext_);
Move64 (Ext_);
+Lib64 (Ext_);
auxv_t64 (Ext_);
#undef START
diff -ur elfutils-0.148.orig/libelf/gelf_fsize.c
elfutils-0.148/libelf/gelf_fsize.c
--- elfutils-0.148.orig/libelf/gelf_fsize.c 2009-01-08 12:56:37.000000000
-0800
+++ elfutils-0.148/libelf/gelf_fsize.c 2010-08-18 14:11:57.000000000 -0700
@@ -87,7 +87,9 @@
[ELF_T_NHDR] = sizeof (ElfW2(LIBELFBITS, Ext_Nhdr)), \
[ELF_T_SYMINFO] = sizeof (ElfW2(LIBELFBITS, Ext_Syminfo)), \
[ELF_T_MOVE] = sizeof (ElfW2(LIBELFBITS, Ext_Move)), \
- [ELF_T_AUXV] = sizeof (ElfW2(LIBELFBITS, Ext_auxv_t))
+ [ELF_T_LIB] = sizeof (ElfW2(LIBELFBITS, Ext_Lib)), \
+ [ELF_T_AUXV] = sizeof (ElfW2(LIBELFBITS, Ext_auxv_t)), \
+ [ELF_T_GNUHASH] = ELFW2(LIBELFBITS, FSZ_WORD)
TYPE_SIZES (32)
},
[ELFCLASS64 - 1] = {
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