[Bug 225946] /usr/bin/make

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225946

            Bug ID: 225946
           Summary: /usr/bin/make
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: itsdavidmarx at gmail.com

/usr/bin/make core dumps with this Makefile for an archive.
Actually the goal is to have the Makefile work without the
foo.o: foo.c entry, as it does with gmake, but for some reason
I think /usr/bin/make realizes it needs to make lib.a(foo.o) 
but doesn't make it.
For:
% uname -a
FreeBSD metro-6.us.oracle.com 12.0-CURRENT FreeBSD 12.0-CURRENT #10
d26791952(trueos-stable-17.12): Sat Dec  9 18:10:09 UTC 2017    
root at chimera:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64
% cat foo.c
void
foo (
  void)
{
        }
% cat Makefile
all: lib.a

lib.a: lib.a(foo.o)
        ranlib lib.a

.c.a:
        cc -c foo.c
        ar rv lib.a foo.o
        rm -f foo.o

foo.o: foo.c
        cc -c foo.c

clobber: clean
        rm lib.a

clean:
        rm -f foo.o
% /usr/bin/make
Segmentation fault
% gdb /usr/bin/make
run
% gdb /usr/bin/make
GNU gdb (GDB) 8.0.1 [GDB v8.0.1 for FreeBSD]
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
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Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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Reading symbols from /usr/bin/make...Reading symbols from
/usr/lib/debug//usr/bin/make.debug...done.
done.
(gdb) run
Starting program: /usr/bin/make

Program received signal SIGSEGV, Segmentation fault.
strlen (str=0x0) at /usr/src/lib/libc/string/strlen.c:102
102     /usr/src/lib/libc/string/strlen.c: No such file or directory.
(gdb) where
#0  strlen (str=0x0) at /usr/src/lib/libc/string/strlen.c:102
#1  0x000000000041aba2 in Var_Set (name=<optimized out>, val=<optimized out>,
    ctxt=0x800cf6ac0, flags=0) at /usr/src/contrib/bmake/var.c:973
#2  0x0000000000402090 in Compat_Make (gnp=0x800cf6b80, pgnp=0x800cf6ac0)
    at /usr/src/contrib/bmake/compat.c:657
#3  0x000000000041faf6 in Lst_ForEachFrom (l=0x800d700a0, ln=0x800d3e1c0,
    proc=0x401fd0 <Compat_Make>, d=0x800cf6ac0)
    at /usr/src/contrib/bmake/lst.lib/lstForEachFrom.c:104
#4  0x0000000000402041 in Compat_Make (gnp=0x800cf6ac0, pgnp=0x800cf6940)
    at /usr/src/contrib/bmake/compat.c:544
#5  0x000000000041faf6 in Lst_ForEachFrom (l=0x800d6fdd0, ln=0x800d3e160,
    proc=0x401fd0 <Compat_Make>, d=0x800cf6940)
    at /usr/src/contrib/bmake/lst.lib/lstForEachFrom.c:104
#6  0x0000000000402041 in Compat_Make (gnp=0x800cf6940, pgnp=0x800cf6880)
    at /usr/src/contrib/bmake/compat.c:544
#7  0x000000000041faf6 in Lst_ForEachFrom (l=0x800d6fc20, ln=0x800d71900,
    proc=0x401fd0 <Compat_Make>, d=0x800cf6880)
    at /usr/src/contrib/bmake/lst.lib/lstForEachFrom.c:104
#8  0x0000000000402041 in Compat_Make (gnp=0x800cf6880, pgnp=0x800cf67c0)
    at /usr/src/contrib/bmake/compat.c:544
#9  0x000000000041faf6 in Lst_ForEachFrom (l=0x800d6fb00, ln=0x800d718a0,
    proc=0x401fd0 <Compat_Make>, d=0x800cf67c0)
    at /usr/src/contrib/bmake/lst.lib/lstForEachFrom.c:104
---Type <return> to continue, or q <return> to quit---
#10 0x0000000000402041 in Compat_Make (gnp=0x800cf67c0, pgnp=0x800cf67c0)
    at /usr/src/contrib/bmake/compat.c:544
#11 0x00000000004024e6 in Compat_Run (targs=0x800cfa3a0)
    at /usr/src/contrib/bmake/compat.c:761
#12 0x000000000040cce7 in runTargets () at /usr/src/contrib/bmake/main.c:960
#13 main (argc=1, argv=<optimized out>) at /usr/src/contrib/bmake/main.c:1498
(gdb) x/i $rip
=> 0x460b7f <strlen+31>:        mov    (%rcx),%rax
(gdb) x/x $rcx
0x0:    Cannot access memory at address 0x0
(gdb)
Appears to be strlen of a null pointer.
Whatever garbage I give make, it should not core dump.
And this does work with gmake.

Thanks.

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