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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/calls/raise.c
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@ -18,8 +18,10 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/getconsolectrlevent.internal.h"
#include "libc/calls/internal.h"
#include "libc/calls/sig.internal.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/struct/sigset.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/intrin/kprintf.h"
@ -39,7 +41,7 @@ static textwindows inline bool HasWorkingConsole(void) {
}
/**
* Sends signal to this process.
* Sends signal to this thread.
*
* @param sig can be SIGALRM, SIGINT, SIGTERM, SIGKILL, etc.
* @return 0 on success or -1 w/ errno
@ -56,8 +58,7 @@ int raise(int sig) {
x = 1 / x;
rc = 0;
} else if (!IsWindows()) {
// XXX: should be tkill() or tgkill() on linux
rc = sys_kill(getpid(), sig, 1);
rc = sys_tkill(gettid(), sig, 0);
} else {
if (HasWorkingConsole() && (event = GetConsoleCtrlEvent(sig)) != -1) {
// XXX: MSDN says "If this parameter is zero, the signal is