59 lines
2.0 KiB
Plaintext
59 lines
2.0 KiB
Plaintext
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#!/bin/sh -e
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#
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# is_elf_so_executable - checks whether the given ELF shared object
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# should be treated as an executable.
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#
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# Not an every shared object is a library.
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# For example, PIEs should be treated as executables.
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#
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# Copyright (C) 2003-2016 Dmitry V. Levin <ldv@altlinux.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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[ $# -eq 1 ]
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file="$1"; shift
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# This dynamic linker used to have its entry point
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# equal to the text segment start address.
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[ -n "${file##*/lib64/ld-*.so}" ] || exit 0
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section_header="$(readelf --wide --sections "$file" ||:)"
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# An .interp section means it is an executable, see
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# comm -12 <(grep -Fl .interp /usr/lib/ldscripts/*)
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# <(grep -Fle --shared /usr/lib/ldscripts/*)
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if printf %s "$section_header" |grep -Fqs ' .interp '; then
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exit 0
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fi
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file_header="$(readelf --wide --file-header "$file" ||:)"
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# Zero entry point is treated like no entry points.
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entry="$(printf %s "$file_header" |
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sed -ne 's/^ \+Entry point address: \+0x0*\([1-9a-f][0-9a-f]*\)$/\1/p')"
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# Zero text segment start address is treated like no text segments.
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text="$(printf %s "$section_header" |
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sed -ne 's/^ *\[ *[0-9]\+\] \.text \+PROGBITS \+0*\([1-9a-f][0-9a-f]*\) \+.*/\1/p')"
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# Missing entry point or text segment means it is not an executable.
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# Also, if entry point and text segment start address are equal,
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# it is not an executable.
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[ -z "$entry" ] ||
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[ -z "$text" ] ||
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[ "$entry" = "$text" ] ||
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exit 0
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exit 1
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