diff options
Diffstat (limited to 'sys/compat/freebsd32/freebsd32_misc.c')
| -rw-r--r-- | sys/compat/freebsd32/freebsd32_misc.c | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c index 579d81b..8da3833 100644 --- a/sys/compat/freebsd32/freebsd32_misc.c +++ b/sys/compat/freebsd32/freebsd32_misc.c @@ -2525,11 +2525,13 @@ syscall32_helper_unregister(struct syscall_helper_data *sd) register_t * freebsd32_copyout_strings(struct image_params *imgp) { - int argc, envc; + int argc, envc, i; u_int32_t *vectp; char *stringp, *destp; u_int32_t *stack_base; struct freebsd32_ps_strings *arginfo; + char canary[sizeof(long) * 8]; + int32_t pagesizes32[MAXPAGESIZES]; size_t execpath_len; int szsigcode; @@ -2545,8 +2547,10 @@ freebsd32_copyout_strings(struct image_params *imgp) sv_psstrings; szsigcode = *(imgp->proc->p_sysent->sv_szsigcode); destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE - - roundup(execpath_len, sizeof(char *)) - - roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *)); + roundup(execpath_len, sizeof(char *)) - + roundup(sizeof(canary), sizeof(char *)) - + roundup(sizeof(pagesizes32), sizeof(char *)) - + roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *)); /* * install sigcode @@ -2565,6 +2569,25 @@ freebsd32_copyout_strings(struct image_params *imgp) } /* + * Prepare the canary for SSP. + */ + arc4rand(canary, sizeof(canary), 0); + imgp->canary = (uintptr_t)arginfo - szsigcode - execpath_len - + sizeof(canary); + copyout(canary, (void *)imgp->canary, sizeof(canary)); + imgp->canarylen = sizeof(canary); + + /* + * Prepare the pagesizes array. + */ + for (i = 0; i < MAXPAGESIZES; i++) + pagesizes32[i] = (uint32_t)pagesizes[i]; + imgp->pagesizes = (uintptr_t)arginfo - szsigcode - execpath_len - + roundup(sizeof(canary), sizeof(char *)) - sizeof(pagesizes32); + copyout(pagesizes32, (void *)imgp->pagesizes, sizeof(pagesizes32)); + imgp->pagesizeslen = sizeof(pagesizes32); + + /* * If we have a valid auxargs ptr, prepare some room * on the stack. */ |
