*Synopsis*: *ksh93* crashes in script containing uncommon output redirections
CR 6703761 changed on Dec 22 2008 by <User 1-5Q-5151>
=== Field ============ === New Value ============= === Old Value =============
Root Cause Other - see Research Acti..
====================== =========================== ===========================
*Change Request ID*: 6703761
*Synopsis*: *ksh93* crashes in script containing uncommon output redirections
Product: solaris
Category: shell
Subcategory: korn93
Type: Defect
Subtype:
Status: 7-Fix in Progress
Substatus:
Priority: 1-Very High
Introduced In Release: solaris_nevada
Introduced In Build: snv_72
Responsible Engineer: <User 1-5Q-5151>
Keywords: oss-request, oss-sponsor
=== *Description* ============================================================
Running the following shell script on Indiana (Opensolaris 2005.08) causes ksh
to crash:
----------------------
#!/usr/bin/i86/ksh93
rm -f core
TMPFILE=/tmp/tmp.$$
temp_links=0
add_tmplink() {
[ $temp_links -le 0 ] && echo "" >$TMPFILE && exec 4>&1
temp_links=`expr $temp_links + 1`
}
POS(){
add_tmplink
echo >> $TMPFILE
eval "$*" 3>&1 >> $TMPFILE 2>&1
cat $TMPFILE >&4
exec 1>&4
rm $TMPFILE
if [ -f core ] ; then
echo Core file found
fi
exit
}
fun1 () {
POS fun2 argument
}
fun2 () {
POS function_3 $1
}
function_3 () {
echo 111
echo $1
echo 222
echo $1 | cat
echo 333
}
dummy1 () { : ; }
dummy2 () { : ; }
dummy3 () { : ; }
dummy4 () { : ; }
dummy5 () { : ; }
dummy6 () { : ; }
dummy7 () { : ; }
dummy8 () { : ; }
dummy9 () { : ; }
dummy10() { : ; }
dummy11() { : ; }
dummy12() { : ; }
dummy13() { : ; }
dummy14() { : ; }
dummydummydummydummy () { : ; }
POS fun1
----------------------
This is perfectly reproducible on several i86pc machines on various versions of
Nevada:
<email address omitted>:~$ ls -l core
/opt/sfw/bin/ls: core: No such file or directory
<email address omitted>:~$ ./setuplib
[several empty lines]
111
argument
222
333
Core file found
<email address omitted>:~$ ls -l ./core
-rw------- 1 ps216548 staff 4442198 May 16 16:20 ./core
BTW, note that the script is supposed to write 'argument' between '222' and
'333' too.
MDB says the following:
<email address omitted>:~$ mdb core
Loading modules: [ libc.so.1 ld.so.1 ]
> ::status
debugging core file of setuplib (32-bit) from eschaton
file: /usr/bin/i86/ksh93
initial argv: /usr/bin/i86/ksh93 ./setuplib
threading model: native threads
status: process terminated by SIGSEGV (Segmentation Fault)
> $c
libc.so.1`strlen+0xb(8061280)
libshell.so.1`copyto+0x8e7(8061280, 0, 0)
libshell.so.1`sh_macexpand+0x185(8073e74, 8035bec, 0)
libshell.so.1`arg_expand+0x8b(8073e74, 8035bec, 0)
libshell.so.1`sh_argbuild+0x9f(80360c4, 8073e54, 0)
libshell.so.1`sh_exec+0x1e6f(8073e54, 5)
libshell.so.1`sh_exec+0x32ba(8073e80, 4)
... [a screenful of sh_exec's, sh_eval's, and friends]
libshell.so.1`sh_funct+0xe4(8073808, 2, 8067468, 0, 5)
libshell.so.1`sh_exec+0x2d37(8067428, 5)
libshell.so.1`exfile+0x64c(fef9eca0, 8072368, a)
libshell.so.1`sh_main+0x6a0(2, 8047b98, 0)
main+0x1d(2, 8047b98, 8047ba4)
_start+0x7a(2, 8047c74, 8047c87, 0, 80611f0, 8047d16)
The problem is magnified by having /bin/sh linked to /usr/bin/i86/ksh93 in
Indiana.
*** (#1 of 2): 2008-05-16 14:33:51 GMT+00:00 <User 1-61155F>
;The problem with the script above seems to be that it redirects 3>..., but it
does not
;open the fd 3 anywhere.
;
;Still, ksh should respond to the misusage of redirections by an error message
instead
;of blowing oneself to pieces.
Edit: The conclusion about the problem with the script was hasty. Now I
believe there is nothing wrong with the script.
*** (#2 of 2): 2008-05-23 15:39:17 GMT+00:00 <User 1-61155F>
*** Last Edit: 2008-05-23 16:00:02 GMT+00:00 <User 1-61155F>
=== *Public Comments* ========================================================
=== *Workaround* =============================================================
=== *Additional Details* =====================================================
Targeted Release: solaris_nevada
Commit To Fix In Build: snv_106
Fixed In Build:
Integrated In Build:
Verified In Build:
See Also: 6619428
Duplicate of:
Hooks:
Hook1:
Hook2:
Hook3:
Hook4:
Hook5: <email address omitted>
Hook6: <email address omitted>
Program Management:
Root Cause: Other - see Research Activity
Fix Affects Documentation: No
Fix Affects Localization: No
=== *History* ================================================================
Date Submitted: 2008-05-16 14:33:50 GMT+00:00
Submitted By: <User 1-61155F>
Status Changed Date Updated Updated By
6-Fix Understood 2008-10-14 17:15:37 GMT+00:00 <User 1-5Q-5151>
7-Fix in Progress 2008-12-15 23:36:23 GMT+00:00 <User 1-5Q-5151>
=== *Service Request* ========================================================
Impact: Significant
Functionality: Secondary
Severity: 3
Product Name: storage-tests
Product Release: v4
Product Build:
Operating System: solaris_nevada
Hardware:
Submitted Date: 2008-05-16 14:33:51 GMT+00:00
=== *Multiple Release (MR) Cluster* - 0 ======================================
