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Rewrite Linux pledge() code so it can be a payload

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It's now possible to build our pledge() polyfill as a dynamic shared
object that can be injected into a glibc executable using LD_PRELOAD
This commit is contained in:
Justine Tunney 2022-08-08 11:41:08 -07:00
parent 7bd4179b9b
commit 0277d7d6e9
37 changed files with 1980 additions and 1600 deletions
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7
libc/intrin/exit1.greg.c
View file

@ -19,6 +19,7 @@
#include "libc/calls/strace.internal.h"
#include "libc/dce.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/promises.internal.h"
#include "libc/nt/thread.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/nr.h"
@ -35,6 +36,12 @@ privileged wontreturn void _Exit1(int rc) {
struct WinThread *wt;
STRACE("_Exit1(%d)", rc);
if (!IsWindows() && !IsMetal()) {
if (IsOpenbsd() && !PLEDGED(STDIO)) {
asm volatile("syscall"
: /* no outputs */
: "a"(__NR_exit), "D"(rc)
: "rcx", "r11", "memory");
}
asm volatile("xor\t%%r10d,%%r10d\n\t"
"syscall"
: /* no outputs */