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kprobes: add testcases for s390
Add a few testcases to make sure that it's not possible to place a kprobe in the mid of an instruction on s390. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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@ -946,4 +946,16 @@ config S390_UNWIND_SELFTEST
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Say N if you are unsure.
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config S390_KPROBES_SANITY_TEST
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def_tristate n
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prompt "Enable s390 specific kprobes tests"
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depends on KPROBES
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depends on KUNIT
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help
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This option enables an s390 specific kprobes test module. This option
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is not useful for distributions or general kernels, but only for kernel
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developers working on architecture code.
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Say N if you are unsure.
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endmenu
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@ -62,6 +62,7 @@ CONFIG_CMM=m
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CONFIG_APPLDATA_BASE=y
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CONFIG_KVM=m
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CONFIG_S390_UNWIND_SELFTEST=y
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CONFIG_S390_KPROBES_SANITY_TEST=y
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CONFIG_KPROBES=y
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CONFIG_JUMP_LABEL=y
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CONFIG_STATIC_KEYS_SELFTEST=y
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@ -7,6 +7,8 @@ lib-y += delay.o string.o uaccess.o find.o spinlock.o
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obj-y += mem.o xor.o
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lib-$(CONFIG_KPROBES) += probes.o
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lib-$(CONFIG_UPROBES) += probes.o
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obj-$(CONFIG_S390_KPROBES_SANITY_TEST) += test_kprobes_s390.o
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test_kprobes_s390-objs += test_kprobes_asm.o test_kprobes.o
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# Instrumenting memory accesses to __user data (in different address space)
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# produce false positives
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75
arch/s390/lib/test_kprobes.c
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75
arch/s390/lib/test_kprobes.c
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@ -0,0 +1,75 @@
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// SPDX-License-Identifier: GPL-2.0+
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include <linux/random.h>
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#include <kunit/test.h>
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#include "test_kprobes.h"
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static struct kprobe kp;
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static void setup_kprobe(struct kunit *test, struct kprobe *kp,
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const char *symbol, int offset)
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{
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kp->offset = offset;
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kp->addr = NULL;
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kp->symbol_name = symbol;
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}
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static void test_kprobe_offset(struct kunit *test, struct kprobe *kp,
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const char *target, int offset)
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{
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int ret;
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setup_kprobe(test, kp, target, 0);
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ret = register_kprobe(kp);
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if (!ret)
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unregister_kprobe(kp);
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KUNIT_EXPECT_EQ(test, 0, ret);
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setup_kprobe(test, kp, target, offset);
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ret = register_kprobe(kp);
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KUNIT_EXPECT_EQ(test, -EINVAL, ret);
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if (!ret)
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unregister_kprobe(kp);
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}
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static void test_kprobe_odd(struct kunit *test)
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{
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test_kprobe_offset(test, &kp, "kprobes_target_odd",
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kprobes_target_odd_offs);
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}
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static void test_kprobe_in_insn4(struct kunit *test)
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{
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test_kprobe_offset(test, &kp, "kprobes_target_in_insn4",
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kprobes_target_in_insn4_offs);
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}
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static void test_kprobe_in_insn6_lo(struct kunit *test)
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{
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test_kprobe_offset(test, &kp, "kprobes_target_in_insn6_lo",
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kprobes_target_in_insn6_lo_offs);
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}
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static void test_kprobe_in_insn6_hi(struct kunit *test)
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{
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test_kprobe_offset(test, &kp, "kprobes_target_in_insn6_hi",
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kprobes_target_in_insn6_hi_offs);
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}
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static struct kunit_case kprobes_testcases[] = {
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KUNIT_CASE(test_kprobe_odd),
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KUNIT_CASE(test_kprobe_in_insn4),
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KUNIT_CASE(test_kprobe_in_insn6_lo),
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KUNIT_CASE(test_kprobe_in_insn6_hi),
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{}
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};
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static struct kunit_suite kprobes_test_suite = {
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.name = "kprobes_test_s390",
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.test_cases = kprobes_testcases,
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};
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kunit_test_suites(&kprobes_test_suite);
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MODULE_LICENSE("GPL");
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10
arch/s390/lib/test_kprobes.h
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10
arch/s390/lib/test_kprobes.h
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@ -0,0 +1,10 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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#ifndef TEST_KPROBES_H
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#define TEST_KPROBES_H
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extern unsigned long kprobes_target_odd_offs;
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extern unsigned long kprobes_target_in_insn4_offs;
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extern unsigned long kprobes_target_in_insn6_lo_offs;
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extern unsigned long kprobes_target_in_insn6_hi_offs;
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#endif
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45
arch/s390/lib/test_kprobes_asm.S
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45
arch/s390/lib/test_kprobes_asm.S
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@ -0,0 +1,45 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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#include <linux/linkage.h>
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#include <asm/ftrace.h>
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#define KPROBES_TARGET_START(name) \
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SYM_FUNC_START(name); \
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FTRACE_GEN_NOP_ASM(name)
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#define KPROBES_TARGET_END(name) \
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SYM_FUNC_END(name); \
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SYM_DATA(name##_offs, .quad 1b - name)
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KPROBES_TARGET_START(kprobes_target_in_insn4)
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.word 0x4700 // bc 0,0
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1: .word 0x0000
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br %r14
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KPROBES_TARGET_END(kprobes_target_in_insn4)
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KPROBES_TARGET_START(kprobes_target_in_insn6_lo)
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.word 0xe310 // ly 1,0
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1: .word 0x0000
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.word 0x0058
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br %r14
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KPROBES_TARGET_END(kprobes_target_in_insn6_lo)
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KPROBES_TARGET_START(kprobes_target_in_insn6_hi)
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.word 0xe310 // ly 1,0
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.word 0x0000
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1: .word 0x0058
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br %r14
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KPROBES_TARGET_END(kprobes_target_in_insn6_hi)
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KPROBES_TARGET_START(kprobes_target_bp)
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nop
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.word 0x0000
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nop
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1: br %r14
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KPROBES_TARGET_END(kprobes_target_bp)
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KPROBES_TARGET_START(kprobes_target_odd)
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.byte 0x07
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1: .byte 0x07
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br %r14
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KPROBES_TARGET_END(kprobes_target_odd)
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