Commit 2597a25c authored by Stanislav Fomichev's avatar Stanislav Fomichev Committed by Daniel Borkmann
Browse files

selftests/bpf: Add test to exercise typedef walking 



Add new bpf_fentry_test_sinfo with skb_shared_info argument and try to
access frags.

Signed-off-by: default avatarStanislav Fomichev <sdf@google.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20230626212522.2414485-2-sdf@google.com
parent 819d4342

net/bpf/test_run.c

+4 −0
Original line number Diff line number Diff line
@@ -555,6 +555,10 @@ __bpf_kfunc u32 bpf_fentry_test9(u32 *a) 
	return *a;

}



void noinline bpf_fentry_test_sinfo(struct skb_shared_info *sinfo)

{

}



__bpf_kfunc int bpf_modify_return_test(int a, int *b)

{

	*b += 1;

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

+2 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ 
#include "verifier_stack_ptr.skel.h"

#include "verifier_subprog_precision.skel.h"

#include "verifier_subreg.skel.h"

#include "verifier_typedef.skel.h"

#include "verifier_uninit.skel.h"

#include "verifier_unpriv.skel.h"

#include "verifier_unpriv_perf.skel.h"
@@ -159,6 +160,7 @@ void test_verifier_spin_lock(void) { RUN(verifier_spin_lock); } 
void test_verifier_stack_ptr(void)            { RUN(verifier_stack_ptr); }

void test_verifier_subprog_precision(void)    { RUN(verifier_subprog_precision); }

void test_verifier_subreg(void)               { RUN(verifier_subreg); }

void test_verifier_typedef(void)              { RUN(verifier_typedef); }

void test_verifier_uninit(void)               { RUN(verifier_uninit); }

void test_verifier_unpriv(void)               { RUN(verifier_unpriv); }

void test_verifier_unpriv_perf(void)          { RUN(verifier_unpriv_perf); }

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

0 → 100644
+23 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0



#include <vmlinux.h>

#include <bpf/bpf_helpers.h>

#include "bpf_misc.h"



SEC("fentry/bpf_fentry_test_sinfo")

__description("typedef: resolve")

__success __retval(0)

__naked void resolve_typedef(void)

{

	asm volatile ("					\

	r1 = *(u64 *)(r1 +0);				\

	r2 = *(u64 *)(r1 +%[frags_offs]);		\

	r0 = 0;						\

	exit;						\

"	:

	: __imm_const(frags_offs,

		      offsetof(struct skb_shared_info, frags))

	: __clobber_all);

}



char _license[] SEC("license") = "GPL";