linux-stable/tools/testing/selftests/openat2/Makefile
Aleksa Sarai b28a10aedc selftests: add openat2(2) selftests
Test all of the various openat2(2) flags. A small stress-test of a
symlink-rename attack is included to show that the protections against
".."-based attacks are sufficient.

The main things these self-tests are enforcing are:

  * The struct+usize ABI for openat2(2) and copy_struct_from_user() to
    ensure that upgrades will be handled gracefully (in addition,
    ensuring that misaligned structures are also handled correctly).

  * The -EINVAL checks for openat2(2) are all correctly handled to avoid
    userspace passing unknown or conflicting flag sets (most
    importantly, ensuring that invalid flag combinations are checked).

  * All of the RESOLVE_* semantics (including errno values) are
    correctly handled with various combinations of paths and flags.

  * RESOLVE_IN_ROOT correctly protects against the symlink rename(2)
    attack that has been responsible for several CVEs (and likely will
    be responsible for several more).

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-01-18 09:19:18 -05:00

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Makefile

# SPDX-License-Identifier: GPL-2.0-or-later
CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined
TEST_GEN_PROGS := openat2_test resolve_test rename_attack_test
include ../lib.mk
$(TEST_GEN_PROGS): helpers.c