selftests/sgx: remove checks for file execute permissions

The SGX selftests can fail for a bunch of non-obvious reasons
like 'noexec' permissions on /dev (which is the default *EVERYWHERE*
it seems).

A new test mistakenly also looked for +x permission on the
/dev/sgx_enclave.  File execute permissions really only apply to
the ability of execve() to work on a file, *NOT* on the ability
for an application to map the file with PROT_EXEC.  SGX needs to
mmap(PROT_EXEC), but doesn't need to execve() the device file.

Remove the check.

Fixes: 4284f7acb78b ("selftests/sgx: Improve error detection and messages")
Reported-by: Tim Gardner <tim.gardner@canonical.com>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-sgx@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Tested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/testing/selftests/sgx/load.c b/tools/testing/selftests/sgx/load.c
index 00928be..3ebe5d1 100644 (file)
--- a/tools/testing/selftests/sgx/load.c
+++ b/tools/testing/selftests/sgx/load.c
@@ -150,16 +150,6 @@ bool encl_load(const char *path, struct encl *encl)
                goto err;
        }
 
-       /*
-        * This just checks if the /dev file has these permission
-        * bits set.  It does not check that the current user is
-        * the owner or in the owning group.
-        */
-       if (!(sb.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))) {
-               fprintf(stderr, "no execute permissions on device file %s\n", device_path);
-               goto err;
-       }
-
        ptr = mmap(NULL, PAGE_SIZE, PROT_READ, MAP_SHARED, fd, 0);
        if (ptr == (void *)-1) {
                perror("mmap for read");
@@ -169,13 +159,13 @@ bool encl_load(const char *path, struct encl *encl)
 
 #define ERR_MSG \
 "mmap() succeeded for PROT_READ, but failed for PROT_EXEC.\n" \
-" Check that current user has execute permissions on %s and \n" \
-" that /dev does not have noexec set: mount | grep \"/dev .*noexec\"\n" \
+" Check that /dev does not have noexec set:\n" \
+" \tmount | grep \"/dev .*noexec\"\n" \
 " If so, remount it executable: mount -o remount,exec /dev\n\n"
 
        ptr = mmap(NULL, PAGE_SIZE, PROT_EXEC, MAP_SHARED, fd, 0);
        if (ptr == (void *)-1) {
-               fprintf(stderr, ERR_MSG, device_path);
+               fprintf(stderr, ERR_MSG);
                goto err;
        }
        munmap(ptr, PAGE_SIZE);