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compel: gcs: add opt-in GCS test support for AArch64

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Introduce an opt-in mode for building and running compel tests
with Guarded Control Stack (GCS) enabled on AArch64.

Changes:
 - Extend compel/test/infect to support `GCS_ENABLE=1` builds,
   adding `-mbranch-protection=standard` and
   `-z experimental-gcs=check` to CFLAGS/LDFLAGS.
 - Export required GLIBC_TUNABLES at runtime via `TEST_ENV`.

Usage:
    make -C compel/test/infect GCS_ENABLE=1
    make -C compel/test/infect GCS_ENABLE=1 run

By default (`GCS_ENABLE` unset or 0), builds and runs are unchanged.

Signed-off-by: Igor Svilenkov Bozic <svilenkov@gmail.com>
This commit is contained in:
Igor Svilenkov Bozic 2025-08-14 14:39:52 +02:00 • committed by Alexander Mikhalitsyn
parent 2f676d20e4
commit 92e6e523b5
2 changed files with 9 additions and 1 deletions
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7
compel/test/infect/Makefile
View file

@ -3,6 +3,11 @@ CFLAGS ?= -O2 -g -Wall -Werror
COMPEL := ../../../compel/compel-host
ifeq ($(GCS_ENABLE),1)
CFLAGS += -mbranch-protection=standard -DGCS_TEST_ENABLE=1
LDFLAGS += -z experimental-gcs=check
endif
all: victim spy
run:
@ -17,7 +22,7 @@ clean:
rm -f parasite.o
victim: victim.c
$(CC) $(CFLAGS) -o $@ $^
$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
spy: spy.c parasite.h
$(CC) $(CFLAGS) $(shell $(COMPEL) includes) -o $@ $< $(shell $(COMPEL) --static libs)

3
compel/test/infect/spy.c
View file

@ -112,6 +112,9 @@ int main(int argc, char **argv)
return -1;
}
#ifdef GCS_TEST_ENABLE
setenv("GLIBC_TUNABLES", "glibc.cpu.aarch64_gcs=1:glibc.cpu.aarch64_gcs_policy=2", 1);
#endif
pid = vfork();
if (pid == 0) {
close(p_in[1]);