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Get cosmo_dlopen() working better on System Five

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Imported functions are now aspected with a trampoline that blocks
signals and changes the thread-local storage register. This means
bigger more complicated libraries can now be imported even though
the whole technique remains fundamentally unsafe.
This commit is contained in:
Justine Tunney 2023-11-15 10:48:31 -08:00
parent 3a470ed356
commit e4584ace81
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GPG key ID: BE714B4575D6E328
6 changed files with 304 additions and 190 deletions
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8
libc/intrin/getsafesize.greg.c
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@ -16,6 +16,9 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "ape/sections.internal.h"
#include "libc/intrin/kprintf.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/runtime/stack.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/tls.h"
@ -33,6 +36,11 @@ privileged long __get_safe_size(long want, long extraspace) {
if (!__tls_enabled) return want;
struct PosixThread *pt;
struct CosmoTib *tib = __get_tls_privileged();
if (!IsAutoFrame((uintptr_t)tib >> 16) &&
!(__executable_start <= (const unsigned char *)tib &&
(const unsigned char *)tib < _end)) {
return want;
}
long bottom, sp = GetStackPointer();
if ((char *)sp >= tib->tib_sigstack_addr &&
(char *)sp <= tib->tib_sigstack_addr + tib->tib_sigstack_size) {