Re: bin/56538: netbsd-3 /bin/ls crashes with current libc

[Christos Zoulas <christos%zoulas.com@localhost>]

The following reply was made to PR bin/56538; it has been noted by GNATS.

From: Christos Zoulas <christos%zoulas.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost
Subject: Re: bin/56538: netbsd-3 /bin/ls crashes with current libc
Date: Sun, 5 Dec 2021 13:07:34 -0500

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 ctime(3) returns NULL and the printtime in the 3.0 print.c does not =
 check for it:
 
 Breakpoint 2, ctime (timep=3D0x7f7fffffe12c)
     at /usr/src/lib/libc/time/localtime.c:1913
 1913    {
 (gdb) print *timep
 $1 =3D 1134943252
 (gdb) fin
 Run till exit from #0  ctime (timep=3D0x7f7fffffe12c)
     at /usr/src/lib/libc/time/localtime.c:1913
 0x000000000040367b in printtime ()
 Value returned is $2 =3D 0x7f7ff7a16e80 "Mon Dec 19 00:00:52 2005\n"
 (gdb) n
 Single stepping until exit from function printtime,
 which has no line number information.
 0x0000000000402b69 in printlong ()
 (gdb) fin
 Run till exit from #0  0x0000000000402b69 in printlong ()
 -rw-rw-r--  1 christos  christos  26087656 Dec 19  2005 base.tgz
 
 Breakpoint 2, ctime (timep=3D0x7f7fffffe12c)
     at /usr/src/lib/libc/time/localtime.c:1913
 1913    {
 (gdb) print *timep
 $3 =3D 1638725229
 (gdb) fin
 Run till exit from #0  ctime (timep=3D0x7f7fffffe12c)
     at /usr/src/lib/libc/time/localtime.c:1913
 0x000000000040367b in printtime ()
 Value returned is $4 =3D 0x0
 (gdb) qq
 Undefined command: "qq".  Try "help".
 (gdb) q
 A debugging session is active.
 
 It turns out the reason this is happening is because we
 are trying to load tzfiles using a 32 bit time_t and we are
 probably reading junk.
 
 christos
 
 
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