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b28a10aedc
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>
8 lines
220 B
Makefile
8 lines
220 B
Makefile
# SPDX-License-Identifier: GPL-2.0-or-later
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CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined
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TEST_GEN_PROGS := openat2_test resolve_test rename_attack_test
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include ../lib.mk
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$(TEST_GEN_PROGS): helpers.c
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