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bpf: Reject bpf_timer for PREEMPT_RT

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[ Upstream commit e25ddfb388 ]

When enable CONFIG_PREEMPT_RT, the kernel will warn when run timer
selftests by './test_progs -t timer':

BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48

In order to avoid such warning, reject bpf_timer in verifier when
PREEMPT_RT is enabled.

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20250910125740.52172-2-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Leon Hwang
2025-09-10 20:57:39 +08:00
committed by Greg Kroah-Hartman
parent f577bec983
commit b6b7db6530
1 changed files with 4 additions and 0 deletions
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4
kernel/bpf/verifier.c
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@@ -8405,6 +8405,10 @@ static int process_timer_func(struct bpf_verifier_env *env, int regno,
verifier_bug(env, "Two map pointers in a timer helper"); verifier_bug(env, "Two map pointers in a timer helper");
return -EFAULT; return -EFAULT;
} }
if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
verbose(env, "bpf_timer cannot be used for PREEMPT_RT.\n");
return -EOPNOTSUPP;
}
meta->map_uid = reg->map_uid; meta->map_uid = reg->map_uid;
meta->map_ptr = map; meta->map_ptr = map;
return 0; return 0;