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Wed, 21 Oct 2026 19:22:22 -0700 (PDT) Received: from localhost ([153.61.198.248]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8a0894b4206sm1450303b3a.18.2026.10.21.19.22.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Oct 2026 19:22:21 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Thu, 22 Oct 2026 02:22:20 +0000 Message-Id: Subject: Re: [PATCH bpf-next 9/9] selftests/bpf: Test uprobes and fork() with busy mmap_lock From: "Alexei Starovoitov" To: , Cc: , , , , , , , , , , , , , , , , , , , , , , In-Reply-To: References: <20261022015712.1297331-1-alexei.starovoitov@gmail.com> <20261022015712.1297331-10-alexei.starovoitov@gmail.com> X-Mailer: mkdraft (claude review draft; edit before sending) Content-Transfer-Encoding: 8bit X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Wed, Oct 21, 2026 at 07:10 PM sashiko-bot@kernel.org wrote: >> +#define AREA_MAX (64UL << 30) > > [ ... ] > >> + area = mmap(NULL, AREA_MAX, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0); >> + if (area == MAP_FAILED) >> + goto err; > > [Severity: Medium] > In tools/testing/selftests/bpf/prog_tests/uprobe_busy_mm.c, does AREA_MAX > overflow on 32-bit architectures when passed to mmap() in hold_mmap_lock()? > > Should AREA_MAX be sized appropriately for 32-bit architectures as well? No. uprobe_multi link is 64-bit only. bpf_uprobe_multi_link_attach() returns -EOPNOTSUPP on 32-bit and three of four subtests attach with it.