Red Hat Bugzilla – Bug 72705
Segfault from prelink
Last modified: 2007-04-18 12:46:03 EDT
If you run /usr/sbin/prelink -u On the attached binary, prelink segfaults almost immediately. It's before it reads any other files, so I suspect it will be reproducable. I'm not sure if the binary is corrupt or not; if it is corrupt, that's another prelink bug, but I can't give a reproduction sequence, I'm afraid. It was something like: prelink -a -v prelink -a -u -v prelink /usr/bin/gnome-terminal [ upgrade openssl, which is indirectly pulled in by gnome-terminal ] prelink -a -u With gnome-terminal and libraries mostly from the Milan tree.
Created attachment 73164 [details] gnome-terminal binary reproducing the problem
The binary is in fact broken, sh_link member of .gnu.liblist Shdr has completely bogus value. Not segfaulting on it will be trivial, will try to look where it might come from too.
--- exec.c~ 2002-08-27 16:35:51.000000000 +0200 +++ exec.c 2002-08-27 16:35:51.000000000 +0200 @@ -793,7 +793,7 @@ prelink_exec (struct prelink_info *info) Elf_Data *data; dso->shdr[i].sh_link - = new_dynstr ? new[new_dynstr] : move->old_to_new[dynstrndx]; + = new_dynstr != -1 ? new[new_dynstr] : move->old_to_new[dynstrndx]; data = elf_getdata (dso->scn[i], NULL); data->d_type = ELF_T_WORD; data->d_size = (ndeps - 1) * sizeof (Elf32_Lib); seems like the candidate why sh_link was garbage (new[-1]). I've added checks so that prelink -u wouldn't segfault on bogus sh_link or sh_info fields too. Will be soon in prelink-0.2.0-8.
Assuming fixed in current versions.