Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Daniel Borkmann says:

====================
pull-request: bpf 2023-10-11

We've added 14 non-merge commits during the last 5 day(s) which contain
a total of 12 files changed, 398 insertions(+), 104 deletions(-).

The main changes are:

1) Fix s390 JIT backchain issues in the trampoline code generation which
   previously clobbered the caller's backchain, from Ilya Leoshkevich.

2) Fix zero-size allocation warning in xsk sockets when the configured
   ring size was close to SIZE_MAX, from Andrew Kanner.

3) Fixes for bpf_mprog API that were found when implementing support
   in the ebpf-go library along with selftests, from Daniel Borkmann
   and Lorenz Bauer.

4) Fix riscv JIT to properly sign-extend the return register in programs.
   This fixes various test_progs selftests on riscv, from Björn Töpel.

5) Fix verifier log for async callback return values where the allowed
   range was displayed incorrectly, from David Vernet.

* tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  s390/bpf: Fix unwinding past the trampoline
  s390/bpf: Fix clobbering the caller's backchain in the trampoline
  selftests/bpf: Add testcase for async callback return value failure
  bpf: Fix verifier log for async callback return values
  xdp: Fix zero-size allocation warning in xskq_create()
  riscv, bpf: Track both a0 (RISC-V ABI) and a5 (BPF) return values
  riscv, bpf: Sign-extend return values
  selftests/bpf: Make seen_tc* variable tests more robust
  selftests/bpf: Test query on empty mprog and pass revision into attach
  selftests/bpf: Adapt assert_mprog_count to always expect 0 count
  selftests/bpf: Test bpf_mprog query API via libbpf and raw syscall
  bpf: Refuse unused attributes in bpf_prog_{attach,detach}
  bpf: Handle bpf_mprog_query with NULL entry
  bpf: Fix BPF_PROG_QUERY last field check
====================

Link: https://lore.kernel.org/r/20231010223610.3984-1-daniel@iogearbox.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

arch/riscv/net/bpf_jit_comp64.c

@@ -245,7 +245,7 @@ static void __build_epilogue(bool is_tail_call, struct rv_jit_context *ctx)
 	emit_addi(RV_REG_SP, RV_REG_SP, stack_adjust, ctx);
 	/* Set return value. */
 	if (!is_tail_call)
-		emit_mv(RV_REG_A0, RV_REG_A5, ctx);
+		emit_addiw(RV_REG_A0, RV_REG_A5, 0, ctx);
 	emit_jalr(RV_REG_ZERO, is_tail_call ? RV_REG_T3 : RV_REG_RA,
 		  is_tail_call ? (RV_FENTRY_NINSNS + 1) * 4 : 0, /* skip reserved nops and TCC init */
 		  ctx);
@@ -759,8 +759,10 @@ static int invoke_bpf_prog(struct bpf_tramp_link *l, int args_off, int retval_of
 	if (ret)
 		return ret;
 
-	if (save_ret)
-		emit_sd(RV_REG_FP, -retval_off, regmap[BPF_REG_0], ctx);
+	if (save_ret) {
+		emit_sd(RV_REG_FP, -retval_off, RV_REG_A0, ctx);
+		emit_sd(RV_REG_FP, -(retval_off - 8), regmap[BPF_REG_0], ctx);
+	}
 
 	/* update branch with beqz */
 	if (ctx->insns) {
@@ -853,7 +855,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 
 	save_ret = flags & (BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_RET_FENTRY_RET);
 	if (save_ret) {
-		stack_size += 8;
+		stack_size += 16; /* Save both A5 (BPF R0) and A0 */
 		retval_off = stack_size;
 	}
 
@@ -957,6 +959,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 		if (ret)
 			goto out;
 		emit_sd(RV_REG_FP, -retval_off, RV_REG_A0, ctx);
+		emit_sd(RV_REG_FP, -(retval_off - 8), regmap[BPF_REG_0], ctx);
 		im->ip_after_call = ctx->insns + ctx->ninsns;
 		/* 2 nops reserved for auipc+jalr pair */
 		emit(rv_nop(), ctx);
@@ -988,8 +991,10 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	if (flags & BPF_TRAMP_F_RESTORE_REGS)
 		restore_args(nregs, args_off, ctx);
 
-	if (save_ret)
+	if (save_ret) {
 		emit_ld(RV_REG_A0, -retval_off, RV_REG_FP, ctx);
+		emit_ld(regmap[BPF_REG_0], -(retval_off - 8), RV_REG_FP, ctx);
+	}
 
 	emit_ld(RV_REG_S1, -sreg_off, RV_REG_FP, ctx);
 
@@ -1515,6 +1520,7 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
 		if (ret)
 			return ret;
 
+		if (insn->src_reg != BPF_PSEUDO_CALL)
 			emit_mv(bpf_to_rv_reg(BPF_REG_0, ctx), RV_REG_A0, ctx);
 		break;
 	}

arch/s390/net/bpf_jit_comp.c

@@ -2066,6 +2066,7 @@ struct bpf_tramp_jit {
 				 * func_addr's original caller
 				 */
 	int stack_size;		/* Trampoline stack size */
+	int backchain_off;	/* Offset of backchain */
 	int stack_args_off;	/* Offset of stack arguments for calling
 				 * func_addr, has to be at the top
 				 */
@@ -2086,9 +2087,10 @@ struct bpf_tramp_jit {
 				 * for __bpf_prog_enter() return value and
 				 * func_addr respectively
 				 */
-	int r14_off;		/* Offset of saved %r14 */
 	int run_ctx_off;	/* Offset of struct bpf_tramp_run_ctx */
 	int tccnt_off;		/* Offset of saved tailcall counter */
+	int r14_off;		/* Offset of saved %r14, has to be at the
+				 * bottom */
 	int do_fexit;		/* do_fexit: label */
 };
 
@@ -2247,8 +2249,12 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	 * Calculate the stack layout.
 	 */
 
-	/* Reserve STACK_FRAME_OVERHEAD bytes for the callees. */
+	/*
+	 * Allocate STACK_FRAME_OVERHEAD bytes for the callees. As the s390x
+	 * ABI requires, put our backchain at the end of the allocated memory.
+	 */
 	tjit->stack_size = STACK_FRAME_OVERHEAD;
+	tjit->backchain_off = tjit->stack_size - sizeof(u64);
 	tjit->stack_args_off = alloc_stack(tjit, nr_stack_args * sizeof(u64));
 	tjit->reg_args_off = alloc_stack(tjit, nr_reg_args * sizeof(u64));
 	tjit->ip_off = alloc_stack(tjit, sizeof(u64));
@@ -2256,16 +2262,25 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	tjit->bpf_args_off = alloc_stack(tjit, nr_bpf_args * sizeof(u64));
 	tjit->retval_off = alloc_stack(tjit, sizeof(u64));
 	tjit->r7_r8_off = alloc_stack(tjit, 2 * sizeof(u64));
-	tjit->r14_off = alloc_stack(tjit, sizeof(u64));
 	tjit->run_ctx_off = alloc_stack(tjit,
 					sizeof(struct bpf_tramp_run_ctx));
 	tjit->tccnt_off = alloc_stack(tjit, sizeof(u64));
-	/* The caller has already reserved STACK_FRAME_OVERHEAD bytes. */
-	tjit->stack_size -= STACK_FRAME_OVERHEAD;
+	tjit->r14_off = alloc_stack(tjit, sizeof(u64) * 2);
+	/*
+	 * In accordance with the s390x ABI, the caller has allocated
+	 * STACK_FRAME_OVERHEAD bytes for us. 8 of them contain the caller's
+	 * backchain, and the rest we can use.
+	 */
+	tjit->stack_size -= STACK_FRAME_OVERHEAD - sizeof(u64);
 	tjit->orig_stack_args_off = tjit->stack_size + STACK_FRAME_OVERHEAD;
 
+	/* lgr %r1,%r15 */
+	EMIT4(0xb9040000, REG_1, REG_15);
 	/* aghi %r15,-stack_size */
 	EMIT4_IMM(0xa70b0000, REG_15, -tjit->stack_size);
+	/* stg %r1,backchain_off(%r15) */
+	EMIT6_DISP_LH(0xe3000000, 0x0024, REG_1, REG_0, REG_15,
+		      tjit->backchain_off);
 	/* mvc tccnt_off(4,%r15),stack_size+STK_OFF_TCCNT(%r15) */
 	_EMIT6(0xd203f000 | tjit->tccnt_off,
 	       0xf000 | (tjit->stack_size + STK_OFF_TCCNT));

kernel/bpf/mprog.c

@@ -401,14 +401,16 @@ int bpf_mprog_query(const union bpf_attr *attr, union bpf_attr __user *uattr,
 	struct bpf_mprog_cp *cp;
 	struct bpf_prog *prog;
 	const u32 flags = 0;
+	u32 id, count = 0;
+	u64 revision = 1;
 	int i, ret = 0;
-	u32 id, count;
-	u64 revision;
 
 	if (attr->query.query_flags || attr->query.attach_flags)
 		return -EINVAL;
+	if (entry) {
 		revision = bpf_mprog_revision(entry);
 		count = bpf_mprog_total(entry);
+	}
 	if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags)))
 		return -EFAULT;
 	if (copy_to_user(&uattr->query.revision, &revision, sizeof(revision)))

kernel/bpf/syscall.c

@@ -3796,7 +3796,6 @@ static int bpf_prog_attach(const union bpf_attr *attr)
 {
 	enum bpf_prog_type ptype;
 	struct bpf_prog *prog;
-	u32 mask;
 	int ret;
 
 	if (CHECK_ATTR(BPF_PROG_ATTACH))
@@ -3805,10 +3804,16 @@ static int bpf_prog_attach(const union bpf_attr *attr)
 	ptype = attach_type_to_prog_type(attr->attach_type);
 	if (ptype == BPF_PROG_TYPE_UNSPEC)
 		return -EINVAL;
-	mask = bpf_mprog_supported(ptype) ?
-	       BPF_F_ATTACH_MASK_MPROG : BPF_F_ATTACH_MASK_BASE;
-	if (attr->attach_flags & ~mask)
+	if (bpf_mprog_supported(ptype)) {
+		if (attr->attach_flags & ~BPF_F_ATTACH_MASK_MPROG)
+			return -EINVAL;
+	} else {
+		if (attr->attach_flags & ~BPF_F_ATTACH_MASK_BASE)
 			return -EINVAL;
+		if (attr->relative_fd ||
+		    attr->expected_revision)
+			return -EINVAL;
+	}
 
 	prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
 	if (IS_ERR(prog))
@@ -3878,6 +3883,10 @@ static int bpf_prog_detach(const union bpf_attr *attr)
 			if (IS_ERR(prog))
 				return PTR_ERR(prog);
 		}
+	} else if (attr->attach_flags ||
+		   attr->relative_fd ||
+		   attr->expected_revision) {
+		return -EINVAL;
 	}
 
 	switch (ptype) {
@@ -3913,7 +3922,7 @@ static int bpf_prog_detach(const union bpf_attr *attr)
 	return ret;
 }
 
-#define BPF_PROG_QUERY_LAST_FIELD query.link_attach_flags
+#define BPF_PROG_QUERY_LAST_FIELD query.revision
 
 static int bpf_prog_query(const union bpf_attr *attr,
 			  union bpf_attr __user *uattr)

kernel/bpf/tcx.c

@@ -123,7 +123,6 @@ int tcx_prog_query(const union bpf_attr *attr, union bpf_attr __user *uattr)
 {
 	bool ingress = attr->query.attach_type == BPF_TCX_INGRESS;
 	struct net *net = current->nsproxy->net_ns;
-	struct bpf_mprog_entry *entry;
 	struct net_device *dev;
 	int ret;
 
@@ -133,12 +132,7 @@ int tcx_prog_query(const union bpf_attr *attr, union bpf_attr __user *uattr)
 		ret = -ENODEV;
 		goto out;
 	}
-	entry = tcx_entry_fetch(dev, ingress);
-	if (!entry) {
-		ret = -ENOENT;
-		goto out;
-	}
-	ret = bpf_mprog_query(attr, uattr, entry);
+	ret = bpf_mprog_query(attr, uattr, tcx_entry_fetch(dev, ingress));
 out:
 	rtnl_unlock();
 	return ret;

kernel/bpf/verifier.c

@@ -14479,7 +14479,7 @@ static int check_return_code(struct bpf_verifier_env *env)
 	struct tnum enforce_attach_type_range = tnum_unknown;
 	const struct bpf_prog *prog = env->prog;
 	struct bpf_reg_state *reg;
-	struct tnum range = tnum_range(0, 1);
+	struct tnum range = tnum_range(0, 1), const_0 = tnum_const(0);
 	enum bpf_prog_type prog_type = resolve_prog_type(env->prog);
 	int err;
 	struct bpf_func_state *frame = env->cur_state->frame[0];
@@ -14527,8 +14527,8 @@ static int check_return_code(struct bpf_verifier_env *env)
 			return -EINVAL;
 		}
 
-		if (!tnum_in(tnum_const(0), reg->var_off)) {
-			verbose_invalid_scalar(env, reg, &range, "async callback", "R0");
+		if (!tnum_in(const_0, reg->var_off)) {
+			verbose_invalid_scalar(env, reg, &const_0, "async callback", "R0");
 			return -EINVAL;
 		}
 		return 0;

net/xdp/xsk_queue.c

@@ -34,6 +34,16 @@ struct xsk_queue *xskq_create(u32 nentries, bool umem_queue)
 	q->ring_mask = nentries - 1;
 
 	size = xskq_get_ring_size(q, umem_queue);
+
+	/* size which is overflowing or close to SIZE_MAX will become 0 in
+	 * PAGE_ALIGN(), checking SIZE_MAX is enough due to the previous
+	 * is_power_of_2(), the rest will be handled by vmalloc_user()
+	 */
+	if (unlikely(size == SIZE_MAX)) {
+		kfree(q);
+		return NULL;
+	}
+
 	size = PAGE_ALIGN(size);
 
 	q->ring = vmalloc_user(size);

tools/testing/selftests/bpf/prog_tests/tc_helpers.h

@@ -45,7 +45,7 @@ static inline __u32 ifindex_from_link_fd(int fd)
 	return link_info.tcx.ifindex;
 }
 
-static inline void __assert_mprog_count(int target, int expected, bool miniq, int ifindex)
+static inline void __assert_mprog_count(int target, int expected, int ifindex)
 {
 	__u32 count = 0, attach_flags = 0;
 	int err;
@@ -53,20 +53,22 @@ static inline void __assert_mprog_count(int target, int expected, bool miniq, in
 	err = bpf_prog_query(ifindex, target, 0, &attach_flags,
 			     NULL, &count);
 	ASSERT_EQ(count, expected, "count");
-	if (!expected && !miniq)
-		ASSERT_EQ(err, -ENOENT, "prog_query");
-	else
 	ASSERT_EQ(err, 0, "prog_query");
 }
 
 static inline void assert_mprog_count(int target, int expected)
 {
-	__assert_mprog_count(target, expected, false, loopback);
+	__assert_mprog_count(target, expected, loopback);
 }
 
 static inline void assert_mprog_count_ifindex(int ifindex, int target, int expected)
 {
-	__assert_mprog_count(target, expected, false, ifindex);
+	__assert_mprog_count(target, expected, ifindex);
+}
+
+static inline void tc_skel_reset_all_seen(struct test_tc_link *skel)
+{
+	memset(skel->bss, 0, sizeof(*skel->bss));
 }
 
 #endif /* TC_HELPERS */

tools/testing/selftests/bpf/prog_tests/tc_links.c

@@ -65,6 +65,7 @@ void serial_test_tc_links_basic(void)
 	ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
 	ASSERT_EQ(optq.link_ids[1], 0, "link_ids[1]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -97,6 +98,7 @@ void serial_test_tc_links_basic(void)
 	ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
 	ASSERT_EQ(optq.link_ids[1], 0, "link_ids[1]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -187,6 +189,7 @@ static void test_tc_links_before_target(int target)
 	ASSERT_EQ(optq.prog_ids[2], 0, "prog_ids[2]");
 	ASSERT_EQ(optq.link_ids[2], 0, "link_ids[2]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -194,9 +197,6 @@ static void test_tc_links_before_target(int target)
 	ASSERT_EQ(skel->bss->seen_tc3, false, "seen_tc3");
 	ASSERT_EQ(skel->bss->seen_tc4, false, "seen_tc4");
 
-	skel->bss->seen_tc1 = false;
-	skel->bss->seen_tc2 = false;
-
 	LIBBPF_OPTS_RESET(optl,
 		.flags = BPF_F_BEFORE,
 		.relative_fd = bpf_program__fd(skel->progs.tc2),
@@ -246,6 +246,7 @@ static void test_tc_links_before_target(int target)
 	ASSERT_EQ(optq.prog_ids[4], 0, "prog_ids[4]");
 	ASSERT_EQ(optq.link_ids[4], 0, "link_ids[4]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -342,6 +343,7 @@ static void test_tc_links_after_target(int target)
 	ASSERT_EQ(optq.prog_ids[2], 0, "prog_ids[2]");
 	ASSERT_EQ(optq.link_ids[2], 0, "link_ids[2]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -349,9 +351,6 @@ static void test_tc_links_after_target(int target)
 	ASSERT_EQ(skel->bss->seen_tc3, false, "seen_tc3");
 	ASSERT_EQ(skel->bss->seen_tc4, false, "seen_tc4");
 
-	skel->bss->seen_tc1 = false;
-	skel->bss->seen_tc2 = false;
-
 	LIBBPF_OPTS_RESET(optl,
 		.flags = BPF_F_AFTER,
 		.relative_fd = bpf_program__fd(skel->progs.tc1),
@@ -401,6 +400,7 @@ static void test_tc_links_after_target(int target)
 	ASSERT_EQ(optq.prog_ids[4], 0, "prog_ids[4]");
 	ASSERT_EQ(optq.link_ids[4], 0, "link_ids[4]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -502,6 +502,7 @@ static void test_tc_links_revision_target(int target)
 	ASSERT_EQ(optq.prog_ids[2], 0, "prog_ids[2]");
 	ASSERT_EQ(optq.link_ids[2], 0, "prog_ids[2]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -581,22 +582,20 @@ static void test_tc_chain_classic(int target, bool chain_tc_old)
 
 	assert_mprog_count(target, 2);
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
 	ASSERT_EQ(skel->bss->seen_tc2, true, "seen_tc2");
 	ASSERT_EQ(skel->bss->seen_tc3, chain_tc_old, "seen_tc3");
 
-	skel->bss->seen_tc1 = false;
-	skel->bss->seen_tc2 = false;
-	skel->bss->seen_tc3 = false;
-
 	err = bpf_link__detach(skel->links.tc2);
 	if (!ASSERT_OK(err, "prog_detach"))
 		goto cleanup;
 
 	assert_mprog_count(target, 1);
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -707,16 +706,13 @@ static void test_tc_links_replace_target(int target)
 	ASSERT_EQ(optq.prog_ids[2], 0, "prog_ids[2]");
 	ASSERT_EQ(optq.link_ids[2], 0, "link_ids[2]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
 	ASSERT_EQ(skel->bss->seen_tc2, true, "seen_tc2");
 	ASSERT_EQ(skel->bss->seen_tc3, false, "seen_tc3");
 
-	skel->bss->seen_tc1 = false;
-	skel->bss->seen_tc2 = false;
-	skel->bss->seen_tc3 = false;
-
 	LIBBPF_OPTS_RESET(optl,
 		.flags = BPF_F_REPLACE,
 		.relative_fd = bpf_program__fd(skel->progs.tc2),
@@ -781,16 +777,13 @@ static void test_tc_links_replace_target(int target)
 	ASSERT_EQ(optq.prog_ids[2], 0, "prog_ids[2]");
 	ASSERT_EQ(optq.link_ids[2], 0, "link_ids[2]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
 	ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
 	ASSERT_EQ(skel->bss->seen_tc3, true, "seen_tc3");
 
-	skel->bss->seen_tc1 = false;
-	skel->bss->seen_tc2 = false;
-	skel->bss->seen_tc3 = false;
-
 	err = bpf_link__detach(skel->links.tc2);
 	if (!ASSERT_OK(err, "link_detach"))
 		goto cleanup;
@@ -812,16 +805,13 @@ static void test_tc_links_replace_target(int target)
 	ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
 	ASSERT_EQ(optq.link_ids[1], 0, "link_ids[1]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
 	ASSERT_EQ(skel->bss->seen_tc2, false, "seen_tc2");
 	ASSERT_EQ(skel->bss->seen_tc3, false, "seen_tc3");
 
-	skel->bss->seen_tc1 = false;
-	skel->bss->seen_tc2 = false;
-	skel->bss->seen_tc3 = false;
-
 	err = bpf_link__update_program(skel->links.tc1, skel->progs.tc1);
 	if (!ASSERT_OK(err, "link_update_self"))
 		goto cleanup;
@@ -843,6 +833,7 @@ static void test_tc_links_replace_target(int target)
 	ASSERT_EQ(optq.prog_ids[1], 0, "prog_ids[1]");
 	ASSERT_EQ(optq.link_ids[1], 0, "link_ids[1]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -1254,6 +1245,7 @@ static void test_tc_links_prepend_target(int target)
 	ASSERT_EQ(optq.prog_ids[2], 0, "prog_ids[2]");
 	ASSERT_EQ(optq.link_ids[2], 0, "link_ids[2]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -1261,9 +1253,6 @@ static void test_tc_links_prepend_target(int target)
 	ASSERT_EQ(skel->bss->seen_tc3, false, "seen_tc3");
 	ASSERT_EQ(skel->bss->seen_tc4, false, "seen_tc4");
 
-	skel->bss->seen_tc1 = false;
-	skel->bss->seen_tc2 = false;
-
 	LIBBPF_OPTS_RESET(optl,
 		.flags = BPF_F_BEFORE,
 	);
@@ -1311,6 +1300,7 @@ static void test_tc_links_prepend_target(int target)
 	ASSERT_EQ(optq.prog_ids[4], 0, "prog_ids[4]");
 	ASSERT_EQ(optq.link_ids[4], 0, "link_ids[4]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -1411,6 +1401,7 @@ static void test_tc_links_append_target(int target)
 	ASSERT_EQ(optq.prog_ids[2], 0, "prog_ids[2]");
 	ASSERT_EQ(optq.link_ids[2], 0, "link_ids[2]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -1418,9 +1409,6 @@ static void test_tc_links_append_target(int target)
 	ASSERT_EQ(skel->bss->seen_tc3, false, "seen_tc3");
 	ASSERT_EQ(skel->bss->seen_tc4, false, "seen_tc4");
 
-	skel->bss->seen_tc1 = false;
-	skel->bss->seen_tc2 = false;
-
 	LIBBPF_OPTS_RESET(optl,
 		.flags = BPF_F_AFTER,
 	);
@@ -1468,6 +1456,7 @@ static void test_tc_links_append_target(int target)
 	ASSERT_EQ(optq.prog_ids[4], 0, "prog_ids[4]");
 	ASSERT_EQ(optq.link_ids[4], 0, "link_ids[4]");
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
@@ -1637,38 +1626,33 @@ static void test_tc_chain_mixed(int target)
 
 	assert_mprog_count(target, 1);
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc4, false, "seen_tc4");
 	ASSERT_EQ(skel->bss->seen_tc5, false, "seen_tc5");
 	ASSERT_EQ(skel->bss->seen_tc6, true, "seen_tc6");
 
-	skel->bss->seen_tc4 = false;
-	skel->bss->seen_tc5 = false;
-	skel->bss->seen_tc6 = false;
-
 	err = bpf_link__update_program(skel->links.tc6, skel->progs.tc4);
 	if (!ASSERT_OK(err, "link_update"))
 		goto cleanup;
 
 	assert_mprog_count(target, 1);
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc4, true, "seen_tc4");
 	ASSERT_EQ(skel->bss->seen_tc5, true, "seen_tc5");
 	ASSERT_EQ(skel->bss->seen_tc6, false, "seen_tc6");
 
-	skel->bss->seen_tc4 = false;
-	skel->bss->seen_tc5 = false;
-	skel->bss->seen_tc6 = false;
-
 	err = bpf_link__detach(skel->links.tc6);
 	if (!ASSERT_OK(err, "prog_detach"))
 		goto cleanup;
 
-	__assert_mprog_count(target, 0, true, loopback);
+	assert_mprog_count(target, 0);
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc4, false, "seen_tc4");
@@ -1758,22 +1742,20 @@ static void test_tc_links_ingress(int target, bool chain_tc_old,
 
 	assert_mprog_count(target, 2);
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");
 	ASSERT_EQ(skel->bss->seen_tc2, true, "seen_tc2");
 	ASSERT_EQ(skel->bss->seen_tc3, chain_tc_old, "seen_tc3");
 
-	skel->bss->seen_tc1 = false;
-	skel->bss->seen_tc2 = false;
-	skel->bss->seen_tc3 = false;
-
 	err = bpf_link__detach(skel->links.tc2);
 	if (!ASSERT_OK(err, "prog_detach"))
 		goto cleanup;
 
 	assert_mprog_count(target, 1);
 
+	tc_skel_reset_all_seen(skel);
 	ASSERT_OK(system(ping_cmd), ping_cmd);
 
 	ASSERT_EQ(skel->bss->seen_tc1, true, "seen_tc1");

tools/testing/selftests/bpf/prog_tests/timer.c

@@ -2,6 +2,7 @@
 /* Copyright (c) 2021 Facebook */
 #include <test_progs.h>
 #include "timer.skel.h"
+#include "timer_failure.skel.h"
 
 static int timer(struct timer *timer_skel)
 {
@@ -49,10 +50,11 @@ void serial_test_timer(void)
 
 	timer_skel = timer__open_and_load();
 	if (!ASSERT_OK_PTR(timer_skel, "timer_skel_load"))
-		goto cleanup;
+		return;
 
 	err = timer(timer_skel);
 	ASSERT_OK(err, "timer");
-cleanup:
 	timer__destroy(timer_skel);
+
+	RUN_TESTS(timer_failure);
 }

tools/testing/selftests/bpf/progs/timer_failure.c

+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
+
+#include <linux/bpf.h>
+#include <time.h>
+#include <errno.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+#include "bpf_tcp_helpers.h"
+
+char _license[] SEC("license") = "GPL";
+
+struct elem {
+	struct bpf_timer t;
+};
+
+struct {
+	__uint(type, BPF_MAP_TYPE_ARRAY);
+	__uint(max_entries, 1);
+	__type(key, int);
+	__type(value, struct elem);
+} timer_map SEC(".maps");
+
+static int timer_cb_ret1(void *map, int *key, struct bpf_timer *timer)
+{
+	if (bpf_get_smp_processor_id() % 2)
+		return 1;
+	else
+		return 0;
+}
+
+SEC("fentry/bpf_fentry_test1")
+__failure __msg("should have been in (0x0; 0x0)")
+int BPF_PROG2(test_ret_1, int, a)
+{
+	int key = 0;
+	struct bpf_timer *timer;
+
+	timer = bpf_map_lookup_elem(&timer_map, &key);
+	if (timer) {
+		bpf_timer_init(timer, &timer_map, CLOCK_BOOTTIME);
+		bpf_timer_set_callback(timer, timer_cb_ret1);
+		bpf_timer_start(timer, 1000, 0);
+	}
+
+	return 0;
+}