diff options
| author |   tedu <tedu@openbsd.org> | 2014-01-22 21:06:45 +0000 |
|---|---|---|
| committer | tedu <tedu@openbsd.org> | 2014-01-22 21:06:45 +0000 |
| commit | 2fa321beb47f73cfed1daedbabd3f5ea94c00670 (patch) | |
| tree | b87d0f493b7b171de2fad7bced75d1905ef78106 /lib/libc/string/bzero.3 | |
| parent | Implement the \: (optional line break) escape sequence, (diff) | |
| download | wireguard-openbsd-2fa321beb47f73cfed1daedbabd3f5ea94c00670.tar.xz wireguard-openbsd-2fa321beb47f73cfed1daedbabd3f5ea94c00670.zip | |
add explicit_bzero to libc. implementation subject to change, but start
the ball rolling. ok deraadt.
Diffstat (limited to 'lib/libc/string/bzero.3')
| -rw-r--r-- | lib/libc/string/bzero.3 | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/lib/libc/string/bzero.3 b/lib/libc/string/bzero.3 index 1fd5da81b5c..8476eb863e4 100644 --- a/lib/libc/string/bzero.3 +++ b/lib/libc/string/bzero.3 @@ -27,9 +27,9 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.\" $OpenBSD: bzero.3,v 1.9 2013/06/05 03:39:23 tedu Exp $ +.\" $OpenBSD: bzero.3,v 1.10 2014/01/22 21:06:45 tedu Exp $ .\" -.Dd $Mdocdate: June 5 2013 $ +.Dd $Mdocdate: January 22 2014 $ .Dt BZERO 3 .Os .Sh NAME @@ -39,6 +39,8 @@ .In string.h .Ft void .Fn bzero "void *b" "size_t len" +.Ft void +.Fn explicit_bzero "void *b" "size_t len" .Sh DESCRIPTION The .Fn bzero @@ -51,6 +53,12 @@ If is zero, .Fn bzero does nothing. +.Pp +The +.Fn explicit_bzero +variant behaves the same, but will not be removed by a compiler's dead store +optimization pass, making it useful for clearing sensitive memory such as a +password. .Sh SEE ALSO .Xr memset 3 , .Xr swab 3 @@ -59,3 +67,7 @@ The .Fn bzero function first appeared in .Bx 4.2 . +The +.Fn explicit_bzero +function first appeared in +.Ox 5.5 . |