On 2/11/20 4:54 PM, Kees Cook wrote:
On Tue, Feb 11, 2020 at 02:06:53PM -0700, shuah wrote:
On 2/11/20 12:25 PM, Kees Cook wrote:
On Tue, Feb 11, 2020 at 11:11:21AM -0700, shuah wrote:
On 2/10/20 12:30 PM, Kees Cook wrote:
In order to check the matrix of possible states for handling READ_IMPLIES_EXEC across native, compat, and the state of PT_GNU_STACK, add tests for these execution conditions.
Signed-off-by: Kees Cook keescook@chromium.org
No issues for this to go through tip.
A few problems to fix first. This fails to compile when 32-bit libraries aren't installed. It should fail the 32-bit part and run other checks.
Do you mean the Makefile should detect the missing compat build deps and avoid building them? Testing compat is pretty important to this test, so it seems like missing the build deps causing the build to fail is the correct action here. This is likely true for the x86/ selftests too.
What would you like this to do?
selftests/x86 does this already and runs the dependency check in x86/Makefile.
check_cc.sh:# check_cc.sh - Helper to test userspace compilation support Makefile:CAN_BUILD_I386 := $(shell ./check_cc.sh $(CC) trivial_32bit_program.c -m32) Makefile:CAN_BUILD_X86_64 := $(shell ./check_cc.sh $(CC) trivial_64bit_program.c) Makefile:CAN_BUILD_WITH_NOPIE := $(shell ./check_cc.sh $(CC) trivial_program.c -no-pie)
Take a look and see if you can leverage this.
I did before, and it can certainly be done, but their stuff is somewhat specific to x86_64/ia32. I'm looking at supporting _all_ compat for any 64-bit architecture. I can certainly write some similar build tooling, but the question I have for you is one of coverage:
If a builder is 64-bit, it needs to be able to produce 32-bit compat binaries for testing, otherwise the test is incomplete. (i.e. the tests will only be able to test native behavior and not compat). This doesn't seem like an "XFAIL" situation to me, and it doesn't seem right to silently pass. It seems like the build should explicitly fail because the needed prerequisites are missing. Do you instead want me to just have it skip building the compat binaries if it can't build them?
Can we do the following:
Build and run tests thatc an be built. Skip build and warn that test coverage is incomplete for compat with a strong recommendation on installing 32-bit libraries with some instructions on how to if applicable.
thanks, -- Shuah