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Fix segfault if $PATH contains a .paths directory (#55)

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ksh crashed if it encountered a .paths directory in any of the
directories in $PATH.

Ref: 1534855

src/cmd/ksh93/sh/path.c: path_chkpaths():
- Refuse to read .paths if it's not a regular file
  or a symlink to a regular file.
This commit is contained in:
Anuradha Weeraman 2020-07-02 18:29:07 -04:00 • committed by GitHub
parent 0c40e7c182
commit 035a4cb3f4
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4 changed files with 20 additions and 1 deletions
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src/cmd/ksh93/sh/path.c
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@ -1507,6 +1507,10 @@ static int path_chkpaths(Shell_t *shp,Pathcomp_t *first, Pathcomp_t* old,Pathcom
if((fd=open(stakptr(offset),O_RDONLY))>=0)
{
fstat(fd,&statb);
if (!S_ISREG(statb.st_mode)) {
close(fd);
return 0;
}
n = statb.st_size;
stakseek(offset+pp->len+n+2);
sp = stakptr(offset+pp->len);