linux-kernel - [PATCH 0/1] Limit the number of counter returned from SBI.

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Date:   Fri, 28 Apr 2023 11:02:55 +0000
From:   Viacheslav Mitrofanov <v.v.mitrofanov@...ro.com>
To:     unlisted-recipients:; (no To-header on input)
CC:     <linux@...ro.com>,
        Viacheslav Mitrofanov <v.v.mitrofanov@...ro.com>,
        "Atish Patra" <atishp@...shpatra.org>,
        Anup Patel <anup@...infault.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        <linux-riscv@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/1] Limit the number of counter returned from SBI. 

Perf relies on reliability of SBI. If sth goes wrong the code trusts it.
It happened due to some debug process that I passed more than
RISCV_MAX_COUNTERS to perf from SBI. At the first glance there were
bloating of kalloced variable pmu_ctr_list and counter mask recycle write.
May be there were some other effects. But anyway it is better to add
extra check.

Viacheslav Mitrofanov (1):
  perf: RISC-V: Limit the number of counters returned from SBI.

 drivers/perf/riscv_pmu_sbi.c | 5 +++++
 1 file changed, 5 insertions(+)

-- 
2.37.2