From c9f02c3e29498fd9ecb1a9719c317c305fe509ae Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Thu, 23 Feb 2017 18:16:11 +0000 Subject: [PATCH] readelf: Fix incorrect "Version definition past end of section" message Fix a commit 74e1a04b9787 ("More fixes for reading corrupt ELF files.") `readelf --version-info' regression that caused "Version definition past end of section" to be always printed at the end, even with good section data. For example with the `mips-linux' target we get: $ cat ver_def.s .data .globl new_foo .type new_foo, %object new_foo: .symver new_foo, foo@@ver_foo $ cat ver_def.ver { global: *foo*; local: *; }; $ as -o ver_def.o ver_def.s $ ld -e 0 --export-dynamic --version-script=ver_def.ver -o ver_def ver_def.o $ readelf -V ver_def Version symbols section '.gnu.version' contains 4 entries: Addr: 000000000000007e Offset: 0x01007e Link: 2 (.dynsym) 000: 0 (*local*) 2 (ver_foo) 1 (*global*) 2 (ver_foo) Version definition section '.gnu.version_d' contains 2 entries: Addr: 0x0000000000000088 Offset: 0x010088 Link: 3 (.dynstr) 000000: Rev: 1 Flags: BASE Index: 1 Cnt: 1 Name: ver_def 0x001c: Rev: 1 Flags: none Index: 2 Cnt: 1 Name: ver_foo Version definition past end of section $ The cause is the `if (idx + ent.vd_next <= idx)' condition introduced to ensure forward progress, which however always triggers for good version definition section data as the last entry will have its `vd_next' value set to 0. Adjust the condition then, to say `if (idx + ent.vd_next < idx)' instead and to ensure forward progress limit the number of entries processed to the size of the version definition section, removing the problematic message from output quoted above, while ensuring the original PR 17531 test case is still handled gracefully. Add a suitable test case so that we have `readelf --version-info' coverage; due to the lack of infrastructure needed to run the linker in the `binutils' test suite and limited justification to implement it add a new `readelf.exp' script to the `ld' test suite instead, intended to gather any `readelf' test cases that require the linker to be run. If ever we decide to have linker infrastructure added to the `binutils' test suite, then the script can be moved between the test suites. binutils/ * readelf.c (process_version_sections) : Limit the number of entries processed by the section size. Don't break out of the loop if `ent.vd_next' is 0. ld/ * testsuite/ld-elf/ver_def.d: New test. * testsuite/ld-elf/ver_def.ld: New test linker script. * testsuite/ld-elf/ver_def.ver: New test version script. * testsuite/ld-elf/ver_def.s: New test source. * testsuite/ld-elf/readelf.exp: New test script. --- binutils/ChangeLog | 6 ++++ binutils/readelf.c | 11 ++++-- ld/ChangeLog | 8 +++++ ld/testsuite/ld-elf/readelf.exp | 52 ++++++++++++++++++++++++++++ ld/testsuite/ld-elf/ver_def-tic6x.vd | 20 +++++++++++ ld/testsuite/ld-elf/ver_def.ld | 17 +++++++++ ld/testsuite/ld-elf/ver_def.s | 5 +++ ld/testsuite/ld-elf/ver_def.vd | 15 ++++++++ ld/testsuite/ld-elf/ver_def.ver | 1 + 9 files changed, 132 insertions(+), 3 deletions(-) create mode 100644 ld/testsuite/ld-elf/readelf.exp create mode 100644 ld/testsuite/ld-elf/ver_def-tic6x.vd create mode 100644 ld/testsuite/ld-elf/ver_def.ld create mode 100644 ld/testsuite/ld-elf/ver_def.s create mode 100644 ld/testsuite/ld-elf/ver_def.vd create mode 100644 ld/testsuite/ld-elf/ver_def.ver diff --git a/binutils/ChangeLog b/binutils/ChangeLog index a21e36e6d1e..a528db4207f 100644 --- a/binutils/ChangeLog +++ b/binutils/ChangeLog @@ -1,3 +1,9 @@ +2017-02-24 Maciej W. Rozycki + + * readelf.c (process_version_sections) : Limit + the number of entries processed by the section size. Don't + break out of the loop if `ent.vd_next' is 0. + 2017-02-23 Jan Kratochvil * testsuite/binutils-all/dw5.S: New file. diff --git a/binutils/readelf.c b/binutils/readelf.c index 9caa4da8246..cb0da10194c 100644 --- a/binutils/readelf.c +++ b/binutils/readelf.c @@ -9994,6 +9994,7 @@ process_version_sections (FILE * file) Elf_External_Verdef * edefs; unsigned int idx; unsigned int cnt; + unsigned int end; char * endbuf; found = 1; @@ -10015,7 +10016,10 @@ process_version_sections (FILE * file) break; endbuf = (char *) edefs + section->sh_size; - for (idx = cnt = 0; cnt < section->sh_info; ++cnt) + /* PR 17531: file: id:000001,src:000172+005151,op:splice,rep:2. */ + end = (section->sh_info < section->sh_size + ? section->sh_info : section->sh_size); + for (idx = cnt = 0; cnt < end; ++cnt) { char * vstart; Elf_External_Verdef * edef; @@ -10094,8 +10098,9 @@ process_version_sections (FILE * file) if (j < ent.vd_cnt) printf (_(" Version def aux past end of section\n")); - /* PR 17531: file: id:000001,src:000172+005151,op:splice,rep:2. */ - if (idx + ent.vd_next <= idx) + /* PR 17531: + file: id:000001,src:000172+005151,op:splice,rep:2. */ + if (idx + ent.vd_next < idx) break; idx += ent.vd_next; diff --git a/ld/ChangeLog b/ld/ChangeLog index 420a9ab5b1d..5236ae8a4a7 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,3 +1,11 @@ +2017-02-24 Maciej W. Rozycki + + * testsuite/ld-elf/ver_def.d: New test. + * testsuite/ld-elf/ver_def.ld: New test linker script. + * testsuite/ld-elf/ver_def.ver: New test version script. + * testsuite/ld-elf/ver_def.s: New test source. + * testsuite/ld-elf/readelf.exp: New test script. + 2017-02-23 Maciej W. Rozycki * testsuite/ld-mips-elf/relax-jalr-n32.d: Remove `--relax' diff --git a/ld/testsuite/ld-elf/readelf.exp b/ld/testsuite/ld-elf/readelf.exp new file mode 100644 index 00000000000..92ca1c508a5 --- /dev/null +++ b/ld/testsuite/ld-elf/readelf.exp @@ -0,0 +1,52 @@ +# Expect script for `readelf' tests that depend on LD. +# Copyright (C) 2017 Free Software Foundation, Inc. +# +# This file is part of the GNU Binutils. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, +# MA 02110-1301, USA. +# + +# These tests really belong to the `binutils' testsuite as they verify +# `readelf' rather than LD, however they require LD to be run and we have +# no infrastructure in the `binutils' testsuite to run LD, so we place +# them here. + +# Exclude non-ELF targets. + +if ![is_elf_format] { + return +} + +# This target requires a non-default emulation for successful shared +# library/executable builds, and has dump variances. +set LFLAGS "" +set DUMP "" +if [istarget "tic6x-*-*"] { + append LFLAGS " -melf32_tic6x_le" + set DUMP "-tic6x" +} + +if [check_shared_lib_support] { + run_ld_link_tests [list \ + [list \ + "readelf version information" \ + "$LFLAGS -e 0 --export-dynamic -T ver_def.ld\ + --version-script=ver_def.ver" \ + "" "" \ + {ver_def.s} \ + [list [list readelf --version-info ver_def$DUMP.vd]] \ + "ver_def"]] +} diff --git a/ld/testsuite/ld-elf/ver_def-tic6x.vd b/ld/testsuite/ld-elf/ver_def-tic6x.vd new file mode 100644 index 00000000000..9c3e53509fe --- /dev/null +++ b/ld/testsuite/ld-elf/ver_def-tic6x.vd @@ -0,0 +1,20 @@ +# Verify correct version information output from `readelf' and that there +# is no: +# +# Version definition past end of section +# +# line at the end in particular (hence #pass must not be used here). + +# TI C6X special variant covering an extra `.got.plt' dynamic symbol +# table entry and consequently its `.gnu.version' record made as a +# result of unusual processing in `elf32_tic6x_link_omit_section_dynsym'. + +Version symbols section '\.gnu\.version' contains 5 entries: + Addr: [0-9a-f]+ +Offset: 0x[0-9a-f]+ +Link: 2 \(\.dynsym\) + +000: +0 \(\*local\*\) +0 \(\*local\*\) +2 \(ver_foo\) +1 \(\*global\*\) + + +004: +2 \(ver_foo\) + + +Version definition section '\.gnu\.version_d' contains 2 entries: + +Addr: 0x[0-9a-f]+ +Offset: 0x[0-9a-f]+ +Link: 3 \(\.dynstr\) + +000000: Rev: 1 +Flags: BASE +Index: 1 +Cnt: 1 +Name: ver_def + +0x001c: Rev: 1 +Flags: none +Index: 2 +Cnt: 1 +Name: ver_foo diff --git a/ld/testsuite/ld-elf/ver_def.ld b/ld/testsuite/ld-elf/ver_def.ld new file mode 100644 index 00000000000..9a667524746 --- /dev/null +++ b/ld/testsuite/ld-elf/ver_def.ld @@ -0,0 +1,17 @@ +SECTIONS +{ + .hash : { *(.hash) } + .dynsym : { *(.dynsym) } + .dynstr : { *(.dynstr) } + .gnu.version : { *(.gnu.version) } + .gnu.version_d : { *(.gnu.version_d) } + .dynamic : { *(.dynamic) } + .data : { *(.data) } + .symtab : { *(.symtab) } + .strtab : { *(.strtab) } + .shstrtab : { *(.shstrtab) } + .plt : { *(.plt) } + .got.plt : { *(.got.plt) } + .got : { *(.got) } + /DISCARD/ : { *(*) } +} diff --git a/ld/testsuite/ld-elf/ver_def.s b/ld/testsuite/ld-elf/ver_def.s new file mode 100644 index 00000000000..22b590ceaff --- /dev/null +++ b/ld/testsuite/ld-elf/ver_def.s @@ -0,0 +1,5 @@ + .data + .globl new_foo + .type new_foo, %object +new_foo: + .symver new_foo, foo@@ver_foo diff --git a/ld/testsuite/ld-elf/ver_def.vd b/ld/testsuite/ld-elf/ver_def.vd new file mode 100644 index 00000000000..f75e15ec5ef --- /dev/null +++ b/ld/testsuite/ld-elf/ver_def.vd @@ -0,0 +1,15 @@ +# Verify correct version information output from `readelf' and that there +# is no: +# +# Version definition past end of section +# +# line at the end in particular (hence #pass must not be used here). + +Version symbols section '\.gnu\.version' contains 4 entries: + Addr: [0-9a-f]+ +Offset: 0x[0-9a-f]+ +Link: 2 \(\.dynsym\) + +000: +0 \(\*local\*\) +2 \(ver_foo\) +1 \(\*global\*\) +2 \(ver_foo\) + + +Version definition section '\.gnu\.version_d' contains 2 entries: + +Addr: 0x[0-9a-f]+ +Offset: 0x[0-9a-f]+ +Link: 3 \(\.dynstr\) + +000000: Rev: 1 +Flags: BASE +Index: 1 +Cnt: 1 +Name: ver_def + +0x001c: Rev: 1 +Flags: none +Index: 2 +Cnt: 1 +Name: ver_foo diff --git a/ld/testsuite/ld-elf/ver_def.ver b/ld/testsuite/ld-elf/ver_def.ver new file mode 100644 index 00000000000..306cf9f4913 --- /dev/null +++ b/ld/testsuite/ld-elf/ver_def.ver @@ -0,0 +1 @@ +{ global: *foo*; local: *; }; -- 2.30.2