Re: echo ${HOME#$*/} segfaults
On 11/30/10 8:43 PM, David Rochberg wrote:
Bash Version: 4.1
Patch Level: 5
Release Status: release
Description:
echo ${HOME#$*/} segfaults
Thanks for the report.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRUc...@case.eduhttp://cnswww.cns.cwru.edu/~chet/
echo ${HOME#$*/} segfaults
Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H -I. -I../bash -I../bash/include
-I../bash/lib -g -O2 -Wall
Machine Type: x86_64-pc-linux-gnu
Bash Version: 4.1
Patch Level: 5
Release Status: release
Description:
echo ${HOME#$*/} segfaults
Here's a stack trace from a -g -O0 build of bash 4.1
$ echo ${HOME#$*/}
Program received signal SIGSEGV, Segmentation fault.
0x00454ef1 in quote_string (string=0x0) at subst.c:3490
3490if (*string == 0)
(gdb) where
#0 0x00454ef1 in quote_string (string=0x0) at subst.c:3490
#1 0x0045c85b in param_expand (string=0x715c68 $*/,
sindex=0x7fffdb64, quoted=8, expanded_something=0x0,
contains_dollar_at=0x7fffdb54,
quoted_dollar_at_p=0x7fffdb60,
had_quoted_null_p=0x7fffdb58, pflags=0) at subst.c:7228
#2 0x0045d93d in expand_word_internal
(word=0x7fffdc10, quoted=8, isexp=1, contains_dollar_at=0x0,
expanded_something=0x0) at subst.c:7802
#3 0x0045450b in call_expand_word_internal
(w=0x7fffdc10, q=8, i=1, c=0x0, e=0x0) at subst.c:3129
#4 0x004549fd in expand_string_for_rhs (string=0x715c68
$*/, quoted=8, dollar_at_p=0x0, has_dollar_at=0x0) at subst.c:3315
#5 0x0045694f in getpattern (value=0x715c68 $*/,
quoted=1, expandpat=1) at subst.c:4277
#6 0x00456d41 in parameter_brace_remove_pattern
(varname=0x75f0a8 HOME,
value=0xa23388
\001/\001h\001o\001m\001e\001/\001r\001o\001c\001h\001b\001e\001r\001g,
patstr=0x773f58 $*/, rtype=35, quoted=1) at subst.c:4411
#7 0x0045c298 in parameter_brace_expand
(string=0x757888 ${HOME#$*/}, indexp=0x7fffde6c, quoted=1,
pflags=0, quoted_dollar_atp=0x7fffdfa0,
contains_dollar_at=0x7fffdf94) at subst.c:6990
#8 0x0045c99f in param_expand (string=0x757888
${HOME#$*/}, sindex=0x7fffdfa4, quoted=1,
expanded_something=0x0,
contains_dollar_at=0x7fffdf94,
quoted_dollar_at_p=0x7fffdfa0, had_quoted_null_p=0x7fffdf98,
pflags=0) at subst.c:7314
#9 0x0045d93d in expand_word_internal (word=0xa202a8,
quoted=1, isexp=0, contains_dollar_at=0x7fffe0d4,
expanded_something=0x0) at subst.c:7802
#10 0x0045dfc5 in expand_word_internal (word=0xa8b948,
quoted=0, isexp=0, contains_dollar_at=0x7fffe168,
expanded_something=0x7fffe16c)
at subst.c:7933
#11 0x0045f725 in shell_expand_word_list
(tlist=0xa84f48, eflags=31) at subst.c:8893
#12 0x0045f9df in expand_word_list_internal
(list=0x9eda48, eflags=31) at subst.c:9010
#13 0x0045f04a in expand_words (list=0x9eda48) at subst.c:8632
#14 0x0043ad49 in execute_simple_command
(simple_command=0x71fd88, pipe_in=-1, pipe_out=-1, async=0,
fds_to_close=0x764d08) at execute_cmd.c:3645
#15 0x00435a49 in execute_command_internal
(command=0xa23108, asynchronous=0, pipe_in=-1, pipe_out=-1,
fds_to_close=0x764d08) at execute_cmd.c:730
#16 0x00435221 in execute_command (command=0xa23108) at
execute_cmd.c:375
#17 0x00421d75 in reader_loop () at eval.c:152
#18 0x0041fbed in main (argc=1, argv=0x7fffe4a8,
env=0x7fffe4b8) at shell.c:749
Re: echo ${HOME#$*/} segfaults
But not when $* is not empty:
$ set -- foo
$ echo ${HOME#$*/}
/home/username
On Tue, Nov 30, 2010 at 7:43 PM, David Rochberg rochb...@google.com wrote:
Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H -I. -I../bash -I../bash/include
-I../bash/lib -g -O2 -Wall
Machine Type: x86_64-pc-linux-gnu
Bash Version: 4.1
Patch Level: 5
Release Status: release
Description:
echo ${HOME#$*/} segfaults
Here's a stack trace from a -g -O0 build of bash 4.1
$ echo ${HOME#$*/}
Program received signal SIGSEGV, Segmentation fault.
0x00454ef1 in quote_string (string=0x0) at subst.c:3490
3490 if (*string == 0)
(gdb) where
#0 0x00454ef1 in quote_string (string=0x0) at subst.c:3490
#1 0x0045c85b in param_expand (string=0x715c68 $*/,
sindex=0x7fffdb64, quoted=8, expanded_something=0x0,
contains_dollar_at=0x7fffdb54,
quoted_dollar_at_p=0x7fffdb60,
had_quoted_null_p=0x7fffdb58, pflags=0) at subst.c:7228
#2 0x0045d93d in expand_word_internal
(word=0x7fffdc10, quoted=8, isexp=1, contains_dollar_at=0x0,
expanded_something=0x0) at subst.c:7802
#3 0x0045450b in call_expand_word_internal
(w=0x7fffdc10, q=8, i=1, c=0x0, e=0x0) at subst.c:3129
#4 0x004549fd in expand_string_for_rhs (string=0x715c68
$*/, quoted=8, dollar_at_p=0x0, has_dollar_at=0x0) at subst.c:3315
#5 0x0045694f in getpattern (value=0x715c68 $*/,
quoted=1, expandpat=1) at subst.c:4277
#6 0x00456d41 in parameter_brace_remove_pattern
(varname=0x75f0a8 HOME,
value=0xa23388
\001/\001h\001o\001m\001e\001/\001r\001o\001c\001h\001b\001e\001r\001g,
patstr=0x773f58 $*/, rtype=35, quoted=1) at subst.c:4411
#7 0x0045c298 in parameter_brace_expand
(string=0x757888 ${HOME#$*/}, indexp=0x7fffde6c, quoted=1,
pflags=0, quoted_dollar_atp=0x7fffdfa0,
contains_dollar_at=0x7fffdf94) at subst.c:6990
#8 0x0045c99f in param_expand (string=0x757888
${HOME#$*/}, sindex=0x7fffdfa4, quoted=1,
expanded_something=0x0,
contains_dollar_at=0x7fffdf94,
quoted_dollar_at_p=0x7fffdfa0, had_quoted_null_p=0x7fffdf98,
pflags=0) at subst.c:7314
#9 0x0045d93d in expand_word_internal (word=0xa202a8,
quoted=1, isexp=0, contains_dollar_at=0x7fffe0d4,
expanded_something=0x0) at subst.c:7802
#10 0x0045dfc5 in expand_word_internal (word=0xa8b948,
quoted=0, isexp=0, contains_dollar_at=0x7fffe168,
expanded_something=0x7fffe16c)
at subst.c:7933
#11 0x0045f725 in shell_expand_word_list
(tlist=0xa84f48, eflags=31) at subst.c:8893
#12 0x0045f9df in expand_word_list_internal
(list=0x9eda48, eflags=31) at subst.c:9010
#13 0x0045f04a in expand_words (list=0x9eda48) at subst.c:8632
#14 0x0043ad49 in execute_simple_command
(simple_command=0x71fd88, pipe_in=-1, pipe_out=-1, async=0,
fds_to_close=0x764d08) at execute_cmd.c:3645
#15 0x00435a49 in execute_command_internal
(command=0xa23108, asynchronous=0, pipe_in=-1, pipe_out=-1,
fds_to_close=0x764d08) at execute_cmd.c:730
#16 0x00435221 in execute_command (command=0xa23108) at
execute_cmd.c:375
#17 0x00421d75 in reader_loop () at eval.c:152
#18 0x0041fbed in main (argc=1, argv=0x7fffe4a8,
env=0x7fffe4b8) at shell.c:749
