diff options
| author |   kettenis <kettenis@openbsd.org> | 2020-02-18 12:19:11 +0000 |
|---|---|---|
| committer | kettenis <kettenis@openbsd.org> | 2020-02-18 12:19:11 +0000 |
| commit | 5ecc9681133f1894e81c385eddd09981f78f1193 (patch) | |
| tree | f90e35c6df877071032ae72f1b5098f034597860 /lib/libc | |
| parent | Cleanup <sys/kthread.h> and <sys/proc.h> includes. (diff) | |
| download | wireguard-openbsd-5ecc9681133f1894e81c385eddd09981f78f1193.tar.xz wireguard-openbsd-5ecc9681133f1894e81c385eddd09981f78f1193.zip | |
Now that the kernel skips the two instructions immediately following
a syscall, replace the double nop with a dsb nsh; isb; sequence which
stops the CPU from speculating any further. This fix was suggested
by Anthony Steinhauser.
ok deraadt@
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/arch/aarch64/SYS.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/libc/arch/aarch64/SYS.h b/lib/libc/arch/aarch64/SYS.h index ce3c38aa30a..0c5fd4572a3 100644 --- a/lib/libc/arch/aarch64/SYS.h +++ b/lib/libc/arch/aarch64/SYS.h @@ -1,4 +1,4 @@ -/* $OpenBSD: SYS.h,v 1.4 2020/01/26 02:19:43 kettenis Exp $ */ +/* $OpenBSD: SYS.h,v 1.5 2020/02/18 12:19:11 kettenis Exp $ */ /* $NetBSD: SYS.h,v 1.8 2003/08/07 16:42:02 agc Exp $ */ /*- @@ -54,8 +54,8 @@ #define SYSTRAP(x) \ ldr x8, =SYS_ ## x; \ svc 0; \ - nop; \ - nop + dsb nsh; \ + isb #define CERROR _C_LABEL(__cerror) |