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selftests/bpf: Add test to exercise typedef walking

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

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20230626212522.2414485-2-sdf@google.com
This commit is contained in:
Stanislav Fomichev 2023-06-26 14:25:22 -07:00 committed by Daniel Borkmann
parent 819d43428a
commit 2597a25cb8
3 changed files with 29 additions and 0 deletions
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4
net/bpf/test_run.c
View File

@ -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;

2
tools/testing/selftests/bpf/prog_tests/verifier.c
View File

@ -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); }

23
tools/testing/selftests/bpf/progs/verifier_typedef.c Normal file
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@ -0,0 +1,23 @@
// 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";