Re: bin/55979 (sh single quotes removes nul characters)

[Kamil Rytarowski <kamil%netbsd.org@localhost>]

MSan gives this:

LC_ALL=C  /usr/src/bin/sh/sh ./hello.com
cmdname=0x8 path=0x7f7fffffedac argv[0]=0x299f790
cmdname=0x7140000000c0
cmdname='/home/kamil/.local/bin/r���PQ������1۰��YXr�ƃ�'
==13613==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x46fcf3 in shellexec /usr/src/bin/sh/exec.c:138:18
    #1 0x464ddc in evalcommand /usr/src/bin/sh/eval.c:1392:3
    #2 0x44e198 in evaltree /usr/src/bin/sh/eval.c:375:4
    #3 0x5191cf in cmdloop /usr/src/bin/sh/main.c:320:4
    #4 0x5175fe in main /usr/src/bin/sh/main.c:262:3
    #5 0x41fa8b in ___start (/usr/src/bin/sh/sh+0x41fa8b)

  Uninitialized value was stored to memory at
    #0 0x46f31d in shellexec /usr/src/bin/sh/exec.c:126
    #1 0x464ddc in evalcommand /usr/src/bin/sh/eval.c:1392:3
    #2 0x44e198 in evaltree /usr/src/bin/sh/eval.c:375:4
    #3 0x5191cf in cmdloop /usr/src/bin/sh/main.c:320:4
    #4 0x5175fe in main /usr/src/bin/sh/main.c:262:3
    #5 0x41fa8b in ___start (/usr/src/bin/sh/sh+0x41fa8b)

  Uninitialized value was created by an allocation of 'cmdentry' in the
stack frame of function 'evalcommand'
    #0 0x458420 in evalcommand /usr/src/bin/sh/eval.c:870

SUMMARY: MemorySanitizer: use-of-uninitialized-value
/usr/src/bin/sh/exec.c:138:18 in shellexec
Exiting
./hello.com: 6: Syntax error: ")" unexpected

There is something wrong with or around padvance(). ':' gets stripped
from PATH and there is an uninitialized memory read.