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selftests/nolibc: make stackprotector probing more robust

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nolibc only supports symbol-based stackprotectors, based on the global
variable __stack_chk_guard. Support for this differs between
architectures and toolchains. Some use the symbol mode by default, some
require a flag to enable it and some don't support it at all.

Before the nolibc test Makefile required the availability of
"-mstack-protector-guard=global" to enable stackprotectors.
While this flag makes sure that the correct mode is available it doesn't
work where the correct mode is the only supported one and therefore the
flag is not implemented.

Switch to a more dynamic probing mechanism.
This correctly enables stack protectors for mips, loongarch and m68k.

Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250609-nolibc-stackprotector-robust-v1-1-a1cfc92a568a@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Thomas Weißschuh 2025-06-09 09:39:16 +02:00
parent 19272b37aa
commit b2c765778a
1 changed files with 4 additions and 1 deletions
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5
tools/testing/selftests/nolibc/Makefile
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@ -195,7 +195,10 @@ CFLAGS_sparc32 = $(call cc-option,-m32)
ifeq ($(origin XARCH),command line)
CFLAGS_XARCH = $(CFLAGS_$(XARCH))
endif
CFLAGS_STACKPROTECTOR ?= $(call cc-option,-mstack-protector-guard=global $(call cc-option,-fstack-protector-all))
_CFLAGS_STACKPROTECTOR = $(call cc-option,-fstack-protector-all) $(call cc-option,-mstack-protector-guard=global)
CFLAGS_STACKPROTECTOR ?= $(call try-run, \
echo 'void foo(void) {}' | $(CC) -x c - -o - -S $(CLANG_CROSS_FLAGS) $(_CFLAGS_STACKPROTECTOR) | grep -q __stack_chk_guard, \
$(_CFLAGS_STACKPROTECTOR))
CFLAGS_SANITIZER ?= $(call cc-option,-fsanitize=undefined -fsanitize-trap=all)
CFLAGS ?= -Os -fno-ident -fno-asynchronous-unwind-tables -std=c89 -W -Wall -Wextra \
$(call cc-option,-fno-stack-protector) $(call cc-option,-Wmissing-prototypes) \