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Add memfd fexecve zipos support (#752)

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Gavin Hayes 2023-03-29 21:16:46 -04:00 • committed by GitHub
parent ba42248575
commit 669b4c5f19
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5 changed files with 102 additions and 22 deletions
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16
libc/zipos/get.c
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@ -18,6 +18,7 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/metalfile.internal.h"
#include "libc/fmt/conv.h"
#include "libc/intrin/cmpxchg.h"
#include "libc/intrin/promises.internal.h"
#include "libc/intrin/strace.internal.h"
@ -59,7 +60,7 @@ static void __zipos_munmap_unneeded(const uint8_t *base, const uint8_t *cdir,
* @threadsafe
*/
struct Zipos *__zipos_get(void) {
int fd;
int fd = -1;
ssize_t size;
const char *msg;
static bool once;
@ -67,10 +68,17 @@ struct Zipos *__zipos_get(void) {
const char *progpath;
static struct Zipos zipos;
uint8_t *map, *base, *cdir;
if (!once && PLEDGED(RPATH)) {
progpath = getenv("COSMOPOLITAN_INIT_ZIPOS");
if (progpath) {
fd = atoi(progpath);
}
if (!once && ((fd != -1) || PLEDGED(RPATH))) {
__zipos_lock();
progpath = GetProgramExecutableName();
if ((fd = open(progpath, O_RDONLY)) != -1) {
if (fd == -1) {
progpath = GetProgramExecutableName();
fd = open(progpath, O_RDONLY);
}
if (fd != -1) {
if ((size = getfiledescriptorsize(fd)) != -1ul &&
(map = mmap(0, size, PROT_READ, MAP_SHARED, fd, 0)) != MAP_FAILED) {
if ((base = FindEmbeddedApe(map, size))) {