Re: [PATCH ima-evm-utils v4] Add tests for MMAP_CHECK and MMAP_CHECK_REQPROT hooks

On Thu, 2023-02-02 at 17:23 +0100, Roberto Sassu wrote:

quoted

quoted

+   if (ptr == MAP_FAILED) {
+           ret = ERR_SETUP;
+           if (argv[2] && !strcmp(argv[2], "exec_on_writable") &&
+               errno == EACCES)
+                   ret = ERR_TEST;
+

FYI, on an older distro kernel, the mmap fails and results in following
without any explanation.

Test: check_mmap (hook="MMAP_CHECK", test_mmap arg: "exec")
Unexpected exit status 1 from test_mmap

With some additional debugging, I'm seeing:
Failed mmap() /tmp/tmp.4gD2UjSvC4/tmp.PlzUEm09hO, err: -13 (Permission
denied)b

Uhm, ok. Which kernel is failing?

I'm able to reproduce the error on a next-integrity or next-integrity-
testing kernel, by running the tests multiple times.  The error doesn't
occur the first time running the test, but subsequent times.

Mimi