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Bug 640174 - www-client/chromium-63.0.3239.84: FAILED: gen/blink/platform/CharacterPropertyData.cpp
Summary: www-client/chromium-63.0.3239.84: FAILED: gen/blink/platform/CharacterPropert...
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Sandbox Maintainers
Depends on:
Reported: 2017-12-07 15:05 UTC by wbrana
Modified: 2018-09-22 17:06 UTC (History)
3 users (show)

See Also:
Package list:
Runtime testing required: ---

emerge --info (emerge.txt,6.51 KB, text/plain)
2017-12-10 15:26 UTC, wbrana
build log with usersandbox (chromium-63.0.3239.84:20171210-090619.log.xz,114.73 KB, application/octet-stream)
2017-12-10 15:57 UTC, wbrana
readelf -a character_data_generator (chromium-character_data_generator.readelf.txt,12.96 KB, text/plain)
2018-03-30 14:53 UTC, Hanno Zysik (geki)
sandbox: crashfix bogus symbol table looping (sandbox_crashfix-hack.patch,1.12 KB, patch)
2018-03-30 20:54 UTC, Hanno Zysik (geki)
Details | Diff
sandbox: crashfix looping bogus symbol table (sandbox_crashfix-hack.patch,1.09 KB, patch)
2018-03-31 09:27 UTC, Hanno Zysik (geki)
Details | Diff
sandbox: crashfix no valid symbol name (sandbox_crashfix-no-symbol-name.patch,626 bytes, patch)
2018-04-02 20:35 UTC, Hanno Zysik (geki)
Details | Diff

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Description wbrana 2017-12-07 15:05:27 UTC
renamed chromium-63.0.3239.70.ebuild
4.9.67 grsec kernel


CFLAGS="-pipe -march=native -mtune=native -fomit-frame-pointer"
LDFLAGS="-Wl,-O2 -Wl,--hash-style=gnu  -Wl,--as-needed"

[kernel] python2.7[16513]: segfault at 3471c634899 ip 0000034712cae7b8 sp 000003a1cd6f6fb0 error 4 in[34712ca6000+17000]

[4951/29130] python "../../build/toolchain/" --output="./character_data_generator" -- clang++ -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro -Wl,-z,defs -Wl,--no-as-needed -lpthread -Wl,--as-needed -fuse-ld=lld -m64 -Wl,-O1 -Wl,--gc-sections -Wl,-rpath-link=. -Wl,--disable-new-dtags -Wl,-O2 -Wl,--hash-style=gnu -Wl,--as-needed -o "./character_data_generator" -Wl,--start-group @"./character_data_generator.rsp"  -Wl,--end-group   -ldl -lpthread -lrt 
[4952/29130] touch obj/third_party/WebKit/Source/platform/character_data.inputdeps.stamp
[4953/29130] python ../../third_party/WebKit/Source/build/scripts/ ./character_data_generator gen/blink/platform/CharacterPropertyData.cpp
FAILED: gen/blink/platform/CharacterPropertyData.cpp 
python ../../third_party/WebKit/Source/build/scripts/ ./character_data_generator gen/blink/platform/CharacterPropertyData.cpp
Traceback (most recent call last):
  File "../../third_party/WebKit/Source/build/scripts/", line 26, in <module>
  File "../../third_party/WebKit/Source/build/scripts/", line 23, in main
  File "/usr/lib64/python2.7/", line 186, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['./character_data_generator', 'gen/blink/platform/CharacterPropertyData.cpp']' returned non-zero exit status -11
[4954/29130] python ../../third_party/WebKit/Source/devtools/scripts/build/ inspector toolbox integration_test_runner formatter_worker audits2_worker heap_snapshot_worker --input_path ../../third_party/WebKit/Source/devtools/front_end --output_path resources/inspector
ninja: build stopped: subcommand failed.
 * ERROR: www-client/chromium-63.0.3239.84::x-portage failed (compile phase):
 *   ninja -v -j2 -l2.2 -C out/Release chrome chromedriver chrome_sandbox failed
 * Call stack:
 *, line  124:  Called src_compile
 *   environment, line 5223:  Called eninja '-C' 'out/Release' 'chrome' 'chromedriver' 'chrome_sandbox'
 *   environment, line 1806:  Called die
 * The specific snippet of code:
 *       "$@" || die "${nonfatal_args[@]}" "${*} failed"
 * If you need support, post the output of `emerge --info '=www-client/chromium-63.0.3239.84::x-portage'`,
 * the complete build log and the output of `emerge -pqv '=www-client/chromium-63.0.3239.84::x-portage'`.
Comment 1 wbrana 2017-12-08 19:53:29 UTC
should I post also those outputs and build log?
Comment 2 Mike Gilbert gentoo-dev 2017-12-08 22:47:45 UTC
Hmm.. I'm not sure if the python segfault is related.

The log seems to indicate that the character_data_generator program is exiting with status -11, which seems to indicate a segfault in that program.

Perhaps PaX is killing it?
Comment 3 wbrana 2017-12-09 09:32:57 UTC
kernel log contain following errors after build failure:
[kernel] python2.7[30398]: segfault at 37a6ef78899 ip 0000037a655f2a98 sp 0000039abd1514a0 error 4 in[37a655ea000+17000]
[kernel] grsec: Segmentation fault occurred at 0000037a6ef78899 in /usr/bin/python2.7[python2.7:30398] uid/euid:250/250 gid/egid:250/250, parent /usr/bin/python2.7[python2.7:30397] uid/euid:250/250 gid/egid:250/250
[kernel] grsec: bruteforce prevention initiated for the next 30 minutes or until service restarted, stalling each fork 30 seconds.  Please investigate the crash report for /usr/bin/python2.7[python2.7:30398] uid/euid:250/250 gid/egid:250/250, parent /usr/bin/python2.7[python2.7:30397] uid/euid:250/25
0 gid/egid:250/250

there are also following errors when I run /usr/bin/paxtest
PAX: execution attempt in
PAX: terminating task
grsec: denied RWX mprotect of
Comment 4 wbrana 2017-12-09 10:51:37 UTC
there is core dump from python, but can't get proper backtrace even if python and are compiled with debugging symbols
Comment 5 wbrana 2017-12-09 13:30:42 UTC
tried to run from command line and there is no crash

cd /tmp/portage/www-client/chromium-63.0.3239.84/work/chromium-63.0.3239.84/out/Release/
sudo -u portage /usr/bin/python2.7 ../../third_party/WebKit/Source/build/scripts/ /tmp/portage/www-client/chromium-63.0.3239.84/work/chromium-63.0.3239.84/out/Release/character_data_generator gen/blink/platform/CharacterPropertyData.cpp
Comment 6 wbrana 2017-12-10 11:12:21 UTC
FEATURES with -usersandbox fixed this error
Comment 7 Mike Gilbert gentoo-dev 2017-12-10 15:08:52 UTC
Maybe try upgrading to sandbox-2.12?

Also, please upload a full build log and emerge --info.
Comment 8 wbrana 2017-12-10 15:26:59 UTC
Created attachment 509266 [details]
emerge --info

current info without usersandbox
sandbox-2.12 was already installed
Comment 9 Mike Gilbert gentoo-dev 2017-12-10 15:38:14 UTC
Yeah, then I'm at a loss on this one. Copying sandbox in case someone has any idea here.
Comment 10 wbrana 2017-12-10 15:41:51 UTC
can't add build log: This site can’t be reached
Comment 11 Mike Gilbert gentoo-dev 2017-12-10 15:53:49 UTC
(In reply to wbrana from comment #10)
> can't add build log: This site can’t be reached

Make sure you compress it first (xz build.log).
Comment 12 wbrana 2017-12-10 15:57:05 UTC
Created attachment 509270 [details]
build log with usersandbox
Comment 13 wbrana 2017-12-10 15:59:51 UTC
build log upload problem was probably caused by wrong file permissions
Comment 14 wbrana 2017-12-11 16:49:06 UTC
build successful without usersandbox
still error with grsec 4.9.68, usersandbox and www-client/chromium-63.0.3239.84::gentoo
Comment 15 Hanno Zysik (geki) 2018-03-30 14:39:41 UTC
I got it debugged; libsandbox crashes in 'sb_check_exec'[0] parsing 64 bit elf structure of 'character_data_generator'. I commented out the PARSE_ELF(...) calls and put 'goto done;' to skip 'trace_possible', which slows execution dramatically.

Is there any way to see how the elf structure of 'character_data_generator' looks like to see what is missing? With scanelf or objdump? Binutils changed elf structure lately, IIRC? Or is it clang related? I built chromium with gcc before and it happened with chromium 65 and clang, which is forced. Many random ideas. Anyone help sorting out? :-)


Build sandbox with debugging symbols. Run 'emerge chromium' until crash or compile stage and Ctrl-C to skip unnecessary build-time of mksnapshot and V8. Then execute following commands in 'out/Release' of chromium build to see crash in gdb:

ana Release # runuser -u portage -- ninja character_data_generator
[5/5] LINK ./character_data_generator
ana Release # runuser -u portage -- sandbox ./character_data_generator gen/blink/platform/CharacterPropertyData.cpp
Sandboxed process killed by signal: Segmentation fault
ana Release # runuser -u portage -- gdb sandbox
GNU gdb (Gentoo 8.1 p1) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
Find the GDB manual and other documentation resources online at:
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from sandbox...Reading symbols from /usr/lib64/debug//usr/bin/sandbox.debug...done.
(gdb) set args ./character_data_generator gen/blink/platform/CharacterPropertyData.cpp
(gdb) set follow-fork-mode child
(gdb) r
Starting program: /usr/bin/sandbox ./character_data_generator gen/blink/platform/CharacterPropertyData.cpp
[New process 2863]
process 2863 is executing new program: /bin/bash

Thread 2.1 "bash" received signal SIGSEGV, Segmentation fault.
[Switching to process 2863]
0x00007ffff7bc2bf8 in sb_check_exec (filename=filename@entry=0x55555583b1d0 "./character_data_generator", argv=argv@entry=0x555555840900)
    at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:192
192     /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c: Datei oder Verzeichnis nicht gefunden.
(gdb) bt
#0  0x00007ffff7bc2bf8 in sb_check_exec (filename=filename@entry=0x55555583b1d0 "./character_data_generator", argv=argv@entry=0x555555840900)
    at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:192
#1  0x00007ffff7bc48af in execve_DEFAULT (path=0x55555583b1d0 "./character_data_generator", argv=0x555555840900, envp=0x55555583c550)
    at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:273
#2  0x0000555555579d92 in ?? ()
#3  0x0000555555563252 in ?? ()
#4  0x000055555557ae28 in ?? ()
#5  0x00005555555c2a68 in ?? ()
#6  0x00005555555617e5 in ?? ()
#7  0x00005555555653ef in ?? ()
#8  0x00007ffff75c9f0a in __libc_start_main () from /lib64/
#9  0x00005555555660ba in ?? ()
(gdb) q
Comment 16 Hanno Zysik (geki) 2018-03-30 14:53:55 UTC
Created attachment 526162 [details]
readelf -a character_data_generator
Comment 17 Hanno Zysik (geki) 2018-03-30 19:47:46 UTC
JFYI, it looks like libsandbox is parsing the dynamic symbol table, not symbol table. Since I do not want to spam unnecessarily, see on your system output of 'objdump -t character_data_generator' and 'objdump -T character_data_generator'.

And to workaround current situation (see comment in source), it needs a break condition added. When 'strcmp(symname, "") == 0 && sym->st_name == 0x20000' (the 131072 below) it is done looping. This means by implication that 'symend' is bogus. Any idea to fix that instead?

I added elf32/64 helper functions to be able to debug.

See objdump versus gdb session:

# objdump -T character_data_generator 

character_data_generator:     file format elf64-x86-64

0000000000000000      DF *UND*  0000000000000000  GLIBC_2.2.5 __libc_start_main
0000000000000000  w   D  *UND*  0000000000000000  Base        __gmon_start__
0000000000000000  w   D  *UND*  0000000000000000  Base        _ITM_deregisterTMCloneTable
0000000000000000  w   D  *UND*  0000000000000000  Base        _ITM_registerTMCloneTable
0000000000000000      DF *UND*  0000000000000000  GLIBC_2.2.5 fclose
0000000000000000      DF *UND*  0000000000000000  GLIBC_2.2.5 fopen64
0000000000201174 g    DF .init  0000000000000000  Base        _init
000000000020118c g    DF .fini  0000000000000000  Base        _fini
00000000002021f8 g    D  .got.plt       0000000000000000  Base        _edata
0000000000203001 g    D  .bss   0000000000000000  Base        _end
0000000000203000 g    D  .bss   0000000000000000  Base        __bss_start

(gdb) r
Starting program: /usr/bin/sandbox ./character_data_generator gen/blink/platform/CharacterPropertyData.cpp
[New process 3017]
process 3017 is executing new program: /bin/bash
[Switching to process 3017]

Thread 2.1 "bash" hit Breakpoint 1, _sb_check_exec_parse_elf64 (st_size=11608, elf=<optimized out>) at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:239
239                     if (
(gdb) my_cap
$1 = {st_name = 72, st_info = 18 '\022', st_other = 0 '\000', st_shndx = 14, st_value = 2101620, st_size = 0}
$2 = 0x7ffff7f89480 "_init"

Thread 2.1 "bash" hit Breakpoint 1, _sb_check_exec_parse_elf64 (st_size=11608, elf=<optimized out>) at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:239
239                     if (
$3 = {st_name = 78, st_info = 18 '\022', st_other = 0 '\000', st_shndx = 15, st_value = 2101644, st_size = 0}
$4 = 0x7ffff7f89486 "_fini"

Thread 2.1 "bash" hit Breakpoint 1, _sb_check_exec_parse_elf64 (st_size=11608, elf=<optimized out>) at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:239
239                     if (
$5 = {st_name = 153, st_info = 16 '\020', st_other = 0 '\000', st_shndx = 22, st_value = 2105848, st_size = 0}
$6 = 0x7ffff7f894d1 "_edata"

Thread 2.1 "bash" hit Breakpoint 1, _sb_check_exec_parse_elf64 (st_size=11608, elf=<optimized out>) at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:239
239                     if (
$7 = {st_name = 160, st_info = 16 '\020', st_other = 0 '\000', st_shndx = 23, st_value = 2109441, st_size = 0}
$8 = 0x7ffff7f894d8 "_end"

Thread 2.1 "bash" hit Breakpoint 1, _sb_check_exec_parse_elf64 (st_size=11608, elf=<optimized out>) at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:239
239                     if (
$9 = {st_name = 165, st_info = 16 '\020', st_other = 0 '\000', st_shndx = 23, st_value = 2109440, st_size = 0}
$10 = 0x7ffff7f894dd "__bss_start"

Thread 2.1 "bash" hit Breakpoint 1, _sb_check_exec_parse_elf64 (st_size=11608, elf=<optimized out>) at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:239
239                     if (
$11 = {st_name = 131072, st_info = 1 '\001', st_other = 0 '\000', st_shndx = 1, st_value = 281483566776321, st_size = 281479271743489}
$12 = 0x7ffff7fa9438 ""

Thread 2.1 "bash" hit Breakpoint 1, _sb_check_exec_parse_elf64 (st_size=11608, elf=<optimized out>) at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:239
239                     if (
(gdb) my_cap
$13 = {st_name = 18923656, st_info = 0 '\000', st_other = 4 '\004', st_shndx = 2368, st_value = 1076797607331758087, st_size = 17065622513011119082}
$14 = 0x7ffff91954c0 <error: Cannot access memory at address 0x7ffff91954c0>

Thread 2.1 "bash" received signal SIGSEGV, Segmentation fault.
_sb_check_exec_parse_elf64 (st_size=11608, elf=<optimized out>) at /mnt/data/tmp/portage/sys-apps/sandbox-2.13/work/sandbox-2.13/libsandbox/wrapper-funcs/__wrapper_exec.c:239
239                     if (
(gdb) q
Comment 18 Hanno Zysik (geki) 2018-03-30 20:54:52 UTC
Created attachment 526176 [details, diff]
sandbox: crashfix bogus symbol table looping
Comment 19 Hanno Zysik (geki) 2018-03-31 09:27:47 UTC
Created attachment 526188 [details, diff]
sandbox: crashfix looping bogus symbol table

Actually testing 'symname' is no good. Do test only for bogus 'sym->st_name'.
Comment 20 Hanno Zysik (geki) 2018-03-31 21:27:01 UTC
I am slowly getting into it. :-)

So, looking at glibc source[0] (line 42 and 65), you may better test for 'sym->st_name < str_size' with libsandbox source[1] (at line 170); and not the bogus '0x20000'.

I will test next week.

Comment 21 Hanno Zysik (geki) 2018-04-01 07:43:51 UTC
On a side-note, AFAIS libsandbox's sb_check_exec wants to parse a subset of symbols of the dynamic symbol table(s). Wouldn't it be simpler to parse the section header array for 'hdr->sh_type == SHT_DYNSYM' and read the symbols of these section headers instead? May I open another bug for that, with test code and a patch on success (with fallback for current variant if no such type was found)?
Comment 22 Hanno Zysik (geki) 2018-04-02 20:35:38 UTC
Created attachment 526370 [details, diff]
sandbox: crashfix no valid symbol name

It is possible that symbol name pointer point outside of the range of the string table array. Skip such symbols as glibc does.
Comment 23 Michał Górny archtester Gentoo Infrastructure gentoo-dev Security 2018-09-22 17:06:59 UTC
Is this possibly related: ?