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Two fixes here:

Browse Source 
1. If fgets fails, don't go into an infinite cpu-intensive loop.  Instead,
check to see if the terminal still exists, and sleep(1) otherwise.
2. When we check to see if the terminal still exists, make sure we're not
mislead by EINTR.  This could have been a security issue, but fortunately
the current implementation of tcgetattr doesn't EINTR.

PR: bin/60758
Approved by: rwatson (mentor)
This commit is contained in:
Colin Percival 2004-01-22 04:24:15 +00:00
parent c66380c122
commit 54ca359425
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=124824
1 changed files with 4 additions and 2 deletions
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6
usr.bin/lock/lock.c
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@ -63,6 +63,7 @@ __FBSDID("$FreeBSD$");
#include <sys/consio.h>
#include <err.h>
#include <ctype.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
@ -212,7 +213,7 @@ main(int argc, char **argv)
if (!fgets(s, sizeof(s), stdin)) {
clearerr(stdin);
hi(0);
continue;
goto tryagain;
}
if (usemine) {
s[strlen(s) - 1] = '\0';
@ -226,7 +227,8 @@ main(int argc, char **argv)
if (getuid() == 0)
syslog(LOG_NOTICE, "%d ROOT UNLOCK FAILURE%s (%s on %s)",
failures, failures > 1 ? "S": "", ttynam, hostname);
if (tcgetattr(0, &ntty))
tryagain:
if (tcgetattr(0, &ntty) && (errno != EINTR))
exit(1);
sleep(1); /* to discourage guessing */
}