diff options
Diffstat (limited to 'sys/kern/exec_subr.c')
| -rw-r--r-- | sys/kern/exec_subr.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/sys/kern/exec_subr.c b/sys/kern/exec_subr.c index b712404f3b3..301214722d6 100644 --- a/sys/kern/exec_subr.c +++ b/sys/kern/exec_subr.c @@ -1,4 +1,4 @@ -/* $OpenBSD: exec_subr.c,v 1.29 2011/06/29 12:16:17 tedu Exp $ */ +/* $OpenBSD: exec_subr.c,v 1.30 2012/08/20 23:25:07 matthew Exp $ */ /* $NetBSD: exec_subr.c,v 1.9 1994/12/04 03:10:42 mycroft Exp $ */ /* @@ -42,6 +42,7 @@ #include <sys/resourcevar.h> #include <uvm/uvm.h> +#include <dev/rndvar.h> #ifdef DEBUG /* @@ -289,6 +290,30 @@ vmcmd_map_zero(struct proc *p, struct exec_vmcmd *cmd) } /* + * vmcmd_randomize(): + * handle vmcmd which specifies a randomized address space region. + */ + +int +vmcmd_randomize(struct proc *p, struct exec_vmcmd *cmd) +{ + char *buf; + int error; + + if (cmd->ev_len == 0) + return (0); + if (cmd->ev_len > 1024) + return (EINVAL); + + buf = malloc(cmd->ev_len, M_TEMP, M_WAITOK); + arc4random_buf(buf, cmd->ev_len); + error = copyout(buf, (void *)cmd->ev_addr, cmd->ev_len); + free(buf, M_TEMP); + + return (error); +} + +/* * exec_setup_stack(): Set up the stack segment for an a.out * executable. * |