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Improve pledge() usability and consistency

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- We now kill the program on violations like OpenBSD
- We now print a message explaining which promise is needed
- This change also fixes a linkage bug with thread local storage
- Your sigaction() handlers should now be more thread safe

A new `__pledge_mode` global has been introduced to make pledge() more
customizable on Linux. For example:

    __attribute__((__constructor__)) static void init(void) {
      __pledge_mode = SECCOMP_RET_ERRNO | EPERM;
    }

Can be used to restore our old permissive pledge() behavior.
This commit is contained in:
Justine Tunney 2022-08-07 16:18:33 -07:00
parent 13c1c45075
commit 5546559034
30 changed files with 713 additions and 86 deletions
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18
test/libc/runtime/tls_test.c
View file

@ -16,6 +16,9 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/kprintf.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
#include "libc/testlib/testlib.h"
@ -23,6 +26,21 @@ _Thread_local int x;
_Thread_local int y = 40;
int z = 2;
void PrintInfo(void) {
kprintf("_tdata_size = %d\n", _tdata_size);
kprintf("_tls_size = %d\n", _tls_size);
kprintf("_tls_content = %d\n", _tls_content);
kprintf("__data_start = %p\n", __data_start);
kprintf("__data_end = %p\n", __data_end);
kprintf("_tdata_start = %p\n", _tdata_start);
kprintf("_tdata_end = %p\n", _tdata_end);
kprintf("_tbss_start = %p\n", _tbss_start);
kprintf("_tbss_end = %p\n", _tbss_end);
kprintf("&y = %p\n", &y);
kprintf("__bss_start = %p\n", __bss_start);
kprintf("__bss_end = %p\n", __bss_end);
}
TEST(tls, test) {
EXPECT_EQ(42, x + y + z);
}