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upstream: stricter validation of messaging socket fd number; disallow 

usage of stderr. Based on GHPR492 by RealHurrison

OpenBSD-Commit-ID: 73dbbe82ea16f73ce1d044d3232bc869ae2f2ce8
This commit is contained in:
djm@openbsd.org 2024-04-30 05:53:03 +00:00 committed by Damien Miller
parent da757b022b
commit 2e69a72405
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1 changed files with 2 additions and 2 deletions
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4
ssh-keysign.c
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@ -1,4 +1,4 @@
/* $OpenBSD: ssh-keysign.c,v 1.73 2024/01/11 01:51:16 djm Exp $ */ /* $OpenBSD: ssh-keysign.c,v 1.74 2024/04/30 05:53:03 djm Exp $ */
/* /*
* Copyright (c) 2002 Markus Friedl. All rights reserved. * Copyright (c) 2002 Markus Friedl. All rights reserved.
* *
@ -268,7 +268,7 @@ main(int argc, char **argv)
__progname, rver, version); __progname, rver, version);
if ((r = sshbuf_get_u32(b, (u_int *)&fd)) != 0) if ((r = sshbuf_get_u32(b, (u_int *)&fd)) != 0)
fatal_r(r, "%s: buffer error", __progname); fatal_r(r, "%s: buffer error", __progname);
if (fd < 0 || fd == STDIN_FILENO || fd == STDOUT_FILENO) if (fd <= STDERR_FILENO)
fatal("%s: bad fd = %d", __progname, fd); fatal("%s: bad fd = %d", __progname, fd);
if ((host = get_local_name(fd)) == NULL) if ((host = get_local_name(fd)) == NULL)
fatal("%s: cannot get local name for fd", __progname); fatal("%s: cannot get local name for fd", __progname);