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| author |   millert <millert@openbsd.org> | 1998-07-28 19:47:07 +0000 |
|---|---|---|
| committer | millert <millert@openbsd.org> | 1998-07-28 19:47:07 +0000 |
| commit | 1f681a38ff09a42a10d6fd9d1fe951b7460bf87a (patch) | |
| tree | 0611465b28b9f5a3bab6185f83d5254a85556a41 /lib/libc/sys/read.2 | |
| parent | Fix indentation problems. (diff) | |
| download | wireguard-openbsd-1f681a38ff09a42a10d6fd9d1fe951b7460bf87a.tar.xz wireguard-openbsd-1f681a38ff09a42a10d6fd9d1fe951b7460bf87a.zip | |
For read, write, send, sendto, recv, recvfrom return EINVAL is size arg > SSIZE_MAX. For readv, writev, sendmsg, recvmsg return EINVAL if sum of the over iov_len values overflows an ssize_t. Based on what XPG 4.2 says (though XPG is not entirely consistent here). Basically since the return value is ssize_t allowing size > SSIZE_MAX is bad since people who (incorrectly mind you) check the return value for < 0 instead of == -1 will have bad things happen to them.
Diffstat (limited to 'lib/libc/sys/read.2')
| -rw-r--r-- | lib/libc/sys/read.2 | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/lib/libc/sys/read.2 b/lib/libc/sys/read.2 index 70f8d5c7ab8..9f42215bf7c 100644 --- a/lib/libc/sys/read.2 +++ b/lib/libc/sys/read.2 @@ -1,4 +1,4 @@ -.\" $OpenBSD: read.2,v 1.4 1998/07/28 04:13:34 millert Exp $ +.\" $OpenBSD: read.2,v 1.5 1998/07/28 19:47:10 millert Exp $ .\" $NetBSD: read.2,v 1.6 1995/02/27 12:35:47 cgd Exp $ .\" .\" Copyright (c) 1980, 1991, 1993 @@ -34,7 +34,7 @@ .\" .\" @(#)read.2 8.4 (Berkeley) 2/26/94 .\" -.Dd February 26, 1994 +.Dd July 28, 1998 .Dt READ 2 .Os BSD 4 .Sh NAME @@ -151,6 +151,16 @@ and no data were ready to be read. .El .Pp In addition, +.Fn read +may return following error: +.Bl -tag -width Er +.It Bq Er EINVAL +.Fa nbytes +was larger than +.Ev SSIZE_MAX . +.El +.Pp +Also, .Fn readv may return one of the following errors: .Bl -tag -width Er @@ -164,7 +174,8 @@ The sum of the .Fa iov_len values in the .Fa iov -array overflowed an unsigned 32-bit integer. +array overflowed an +.Em ssize_t . .It Bq Er EFAULT Part of the .Fa iov |