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selftests/bpf: Expand coverage of preempt tests to sleepable kfunc

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For preemption-related kfuncs, we don't test their interaction with
sleepable kfuncs (we do test helpers) even though the verifier has
code to protect against such a pattern. Expand coverage of the selftest
to include this case.

Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20241204030400.208005-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi 2024-12-03 19:03:59 -08:00 committed by Alexei Starovoitov
parent cbd8730aea
commit e8c6c80b76
1 changed files with 14 additions and 0 deletions
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14
tools/testing/selftests/bpf/progs/preempt_lock.c
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@ -5,6 +5,8 @@
#include "bpf_misc.h"
#include "bpf_experimental.h"
extern int bpf_copy_from_user_str(void *dst, u32 dst__sz, const void *unsafe_ptr__ign, u64 flags) __weak __ksym;
SEC("?tc")
__failure __msg("BPF_EXIT instruction in main prog cannot be used inside bpf_preempt_disable-ed region")
int preempt_lock_missing_1(struct __sk_buff *ctx)
@ -113,6 +115,18 @@ int preempt_sleepable_helper(void *ctx)
return 0;
}
SEC("?fentry.s/" SYS_PREFIX "sys_getpgid")
__failure __msg("kernel func bpf_copy_from_user_str is sleepable within non-preemptible region")
int preempt_sleepable_kfunc(void *ctx)
{
u32 data;
bpf_preempt_disable();
bpf_copy_from_user_str(&data, sizeof(data), NULL, 0);
bpf_preempt_enable();
return 0;
}
int __noinline preempt_global_subprog(void)
{
preempt_balance_subprog();