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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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6
libc/calls/execve.c
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@ -19,6 +19,8 @@
#include "libc/bits/likely.h"
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/pledge.h"
#include "libc/calls/pledge.internal.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/syscall-nt.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
@ -30,8 +32,6 @@
#include "libc/sysv/consts/o.h"
#include "libc/sysv/errfuns.h"
int sys_pledge_linux(unsigned long);
/**
* Replaces current process with program.
*
@ -72,7 +72,7 @@ int execve(const char *prog, char *const argv[], char *const envp[]) {
if (!IsWindows()) {
rc = 0;
if (IsLinux() && __execpromises && weaken(sys_pledge_linux)) {
rc = weaken(sys_pledge_linux)(__execpromises);
rc = weaken(sys_pledge_linux)(__execpromises, __pledge_mode, false);
}
if (!rc) {
rc = sys_execve(prog, argv, envp);