Re: bash -c error

[Brian Dessent <brian at dessent dot net>]

Krzysztof Duleba wrote:

> $ bash -c time
> Segmentation fault (core dumped)
> 
> $ uname -a
> CYGWIN_NT-5.1 DULI2 1.5.19s(0.141/4/2) 20051020 10:37:08 i686 unknown
> unknown Cygwin

This looks like a bash bug.  It looks like only 3.0 is affected, as it works
fine in 3.1.  Since 'time' is a builtin, it appears to be a bug in trying to run
time with an empty parameter:

(gdb) bt
#0  0x610d50e1 in strlen () at ../../../../src/winsup/cygserver/client.cc:464
#1  0x00414712 in execute_simple_command (simple_command=0x626560, pipe_in=-1,
pipe_out=-1, async=0, fds_to_close=0x626578) at
/usr/src/bash-3.0/execute_cmd.c:2729
#2  0x00411203 in execute_command_internal (command=0x626548, asynchronous=0,
pipe_in=-1, pipe_out=-1, fds_to_close=0x626578) at
/usr/src/bash-3.0/execute_cmd.c:667
#3  0x00411cdc in time_command (command=0x626548, asynchronous=0, pipe_in=-1,
pipe_out=-1, fds_to_close=0x626578) at /usr/src/bash-3.0/execute_cmd.c:1097
#4  0x00410fb3 in execute_command_internal (command=0x626548, asynchronous=0,
pipe_in=-1, pipe_out=-1, fds_to_close=0x626578) at
/usr/src/bash-3.0/execute_cmd.c:589
#5  0x00449baf in parse_and_execute (string=0x6260d0 "time", from_file=0x46812c
"-c", flags=4) at /usr/src/bash-3.0/builtins/evalstring.c:267
#6  0x004026c0 in run_one_command (command=0x6115b514 "time") at
/usr/src/bash-3.0/shell.c:1259
#7  0x00401848 in main (argc=3, argv=0x6115b4b4, env=0x620090) at
/usr/src/bash-3.0/shell.c:643

The problem is this in execute_cmd.c:

2728		FREE (the_printed_command_except_trap);
2729		the_printed_command_except_trap = savestring (the_printed_command);

where 'the_printed_command_except_trap' is NULL and savestring() is

./lib/readline/histlib.h:37:#ifndef savestring
./lib/readline/histlib.h:38:#define savestring(x) strcpy (xmalloc (1 + strlen
(x)), (x))
./lib/readline/histlib.h-39-#endif
 
Hence, strlen(NULL).

Brian


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