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Implement more security stuff

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- Support deterministic stacks on OpenBSD
- Support OpenBSD system call origin verification
- Fix overrun by one in chibicc string token allocator
- Get all chibicc tests passing under Address Sanitizer
This commit is contained in:
Justine Tunney 2021-02-02 20:21:06 -08:00
parent cbfd4ccd1e
commit c843243322
56 changed files with 376 additions and 245 deletions
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26
tool/build/lib/syscall.c
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@ -19,6 +19,7 @@
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/ioctl.h"
#include "libc/calls/struct/dirent.h"
#include "libc/calls/struct/iovec.h"
#include "libc/calls/struct/rusage.h"
#include "libc/calls/struct/sigaction-linux.internal.h"
@ -770,6 +771,30 @@ static ssize_t OpRead(struct Machine *m, int fd, int64_t addr, size_t size) {
return rc;
}
static int OpGetdents(struct Machine *m, int dirfd, int64_t addr,
uint32_t size) {
int rc;
DIR *dir;
struct dirent *ent;
if (size < sizeof(struct dirent)) return einval();
if (0 <= dirfd && dirfd < m->fds.i) {
if ((dir = fdopendir(m->fds.p[dirfd].fd))) {
rc = 0;
while (rc + sizeof(struct dirent) <= size) {
if (!(ent = readdir(dir))) break;
VirtualRecvWrite(m, addr + rc, ent, ent->d_reclen);
rc += ent->d_reclen;
}
free(dir);
} else {
rc = -1;
}
} else {
rc = ebadf();
}
return rc;
}
static ssize_t OpPread(struct Machine *m, int fd, int64_t addr, size_t size,
int64_t offset) {
ssize_t rc;
@ -1395,6 +1420,7 @@ void OpSyscall(struct Machine *m, uint32_t rde) {
SYSCALL(0x09E, OpArchPrctl(m, di, si));
SYSCALL(0x0BA, OpGetTid(m));
SYSCALL(0x0CB, sched_setaffinity(di, si, P(dx)));
SYSCALL(0x0D9, OpGetdents(m, di, si, dx));
SYSCALL(0x0DD, OpFadvise(m, di, si, dx, r0));
SYSCALL(0x0E4, OpClockGettime(m, di, si));
SYSCALL(0x101, OpOpenat(m, di, si, dx, r0));