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Fix potential symlink race condition in "rm -P" by adding a check

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that the file we have opened is the one we expected.  Also open in
non-blocking mode to avoid a potential hang with FIFOs.

Obtained from:	NetBSD via OpenBSD
This commit is contained in:
Kevin Lo 2012-06-20 02:21:53 +00:00
parent 83b322edc6
commit 4ec1405b39
1 changed files with 9 additions and 2 deletions
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11
bin/rm/rm.c
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@ -408,7 +408,7 @@ rm_file(char **argv)
int
rm_overwrite(char *file, struct stat *sbp)
{
struct stat sb;
struct stat sb, sb2;
struct statfs fsb;
off_t len;
int bsize, fd, wlen;
@ -427,8 +427,15 @@ rm_overwrite(char *file, struct stat *sbp)
file, sbp->st_ino);
return (0);
}
if ((fd = open(file, O_WRONLY, 0)) == -1)
if ((fd = open(file, O_WRONLY|O_NONBLOCK|O_NOFOLLOW, 0)) == -1)
goto err;
if (fstat(fd, &sb2))
goto err;
if (sb2.st_dev != sbp->st_dev || sb2.st_ino != sbp->st_ino ||
!S_ISREG(sb2.st_mode)) {
errno = EPERM;
goto err;
}
if (fstatfs(fd, &fsb) == -1)
goto err;
bsize = MAX(fsb.f_iosize, 1024);