rseq: Use pr_warn_once() when deprecated/unknown ABI flags are encountered
These commits use WARN_ON_ONCE() and kill the offending processes when deprecated and unknown flags are encountered: commitc17a6ff932
("rseq: Kill process when unknown flags are encountered in ABI structures") commit0190e4198e
("rseq: Deprecate RSEQ_CS_FLAG_NO_RESTART_ON_* flags") The WARN_ON_ONCE() triggered by userspace input prevents use of Syzkaller to fuzz the rseq system call. Replace this WARN_ON_ONCE() by pr_warn_once() messages which contain actually useful information. Reported-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Paul E. McKenney <paulmck@kernel.org> Link: https://lkml.kernel.org/r/20221102130635.7379-1-mathieu.desnoyers@efficios.com
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@ -171,12 +171,27 @@ static int rseq_get_rseq_cs(struct task_struct *t, struct rseq_cs *rseq_cs)
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return 0;
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return 0;
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}
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}
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static bool rseq_warn_flags(const char *str, u32 flags)
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{
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u32 test_flags;
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if (!flags)
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return false;
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test_flags = flags & RSEQ_CS_NO_RESTART_FLAGS;
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if (test_flags)
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pr_warn_once("Deprecated flags (%u) in %s ABI structure", test_flags, str);
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test_flags = flags & ~RSEQ_CS_NO_RESTART_FLAGS;
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if (test_flags)
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pr_warn_once("Unknown flags (%u) in %s ABI structure", test_flags, str);
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return true;
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}
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static int rseq_need_restart(struct task_struct *t, u32 cs_flags)
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static int rseq_need_restart(struct task_struct *t, u32 cs_flags)
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{
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{
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u32 flags, event_mask;
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u32 flags, event_mask;
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int ret;
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int ret;
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if (WARN_ON_ONCE(cs_flags & RSEQ_CS_NO_RESTART_FLAGS) || cs_flags)
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if (rseq_warn_flags("rseq_cs", cs_flags))
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return -EINVAL;
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return -EINVAL;
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/* Get thread flags. */
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/* Get thread flags. */
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@ -184,7 +199,7 @@ static int rseq_need_restart(struct task_struct *t, u32 cs_flags)
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if (ret)
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if (ret)
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return ret;
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return ret;
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if (WARN_ON_ONCE(flags & RSEQ_CS_NO_RESTART_FLAGS) || flags)
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if (rseq_warn_flags("rseq", flags))
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return -EINVAL;
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return -EINVAL;
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/*
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/*
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