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commit 65cefbd0793c0f9e90a326d7bebf0a47c93294ad
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Author: Josh Stone <jistone@redhat.com>
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Date: Tue Mar 11 10:19:28 2014 -0700
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libdwfl: dwfl_module_getdwarf.c (open_elf) only (re)set mod->e_type once.
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As noted in https://sourceware.org/bugzilla/show_bug.cgi?id=16676#c2 for
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systemtap, the heuristic used by open_elf to set the kernel Dwfl_Module
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type to ET_DYN, even if the underlying ELF file e_type was set to
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ET_EXEC, could trigger erroneously for non-kernel/non-main (debug or
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aux) files. Make sure we only set the e_type of the module once when
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processing the main file (when the phdrs can be trusted).
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diff --git a/libdwfl/dwfl_module_getdwarf.c b/libdwfl/dwfl_module_getdwarf.c
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index c4bd739..f8de80b 100644
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--- a/libdwfl/dwfl_module_getdwarf.c
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+++ b/libdwfl/dwfl_module_getdwarf.c
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@@ -1,5 +1,5 @@
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/* Find debugging and symbol information for a module in libdwfl.
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- Copyright (C) 2005-2012 Red Hat, Inc.
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+ Copyright (C) 2005-2012, 2014 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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@@ -77,7 +77,7 @@ open_elf (Dwfl_Module *mod, struct dwfl_file *file)
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return DWFL_E (LIBELF, elf_errno ());
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}
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- if (mod->e_type != ET_REL)
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+ if (ehdr->e_type != ET_REL)
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{
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/* In any non-ET_REL file, we compute the "synchronization address".
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@@ -131,11 +131,24 @@ open_elf (Dwfl_Module *mod, struct dwfl_file *file)
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}
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}
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- mod->e_type = ehdr->e_type;
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+ /* We only want to set the module e_type explictly once, derived from
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+ the main ELF file. (It might be changed for the kernel, because
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+ that is special - see below.) open_elf is always called first for
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+ the main ELF file, because both find_dw and find_symtab call
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+ __libdwfl_getelf first to open the main file. So don't let debug
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+ or aux files override the module e_type. The kernel heuristic
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+ below could otherwise trigger for non-kernel/non-main files, since
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+ their phdrs might not match the actual load addresses. */
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+ if (file == &mod->main)
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+ {
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+ mod->e_type = ehdr->e_type;
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- /* Relocatable Linux kernels are ET_EXEC but act like ET_DYN. */
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- if (mod->e_type == ET_EXEC && file->vaddr != mod->low_addr)
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- mod->e_type = ET_DYN;
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+ /* Relocatable Linux kernels are ET_EXEC but act like ET_DYN. */
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+ if (mod->e_type == ET_EXEC && file->vaddr != mod->low_addr)
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+ mod->e_type = ET_DYN;
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+ }
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+ else
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+ assert (mod->main.elf != NULL);
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return DWFL_E_NOERROR;
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}
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