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[2a03:2880:30ff:72::face:b00c]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5cf03c7cafasm1001103a12.84.2024.11.07.09.16.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Nov 2024 09:16:27 -0800 (PST) From: Breno Leitao Date: Thu, 07 Nov 2024 09:14:45 -0800 Subject: [PATCH] uprobes: get RCU trace lock before list iteration Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241107-rcu_probe-v1-1-0ca8cc2dedfb@debian.org> X-B4-Tracking: v=1; b=H4sIAIX1LGcC/x3MSwqAMAwFwKuEt26hLeKnVxERP1GzUUlRhOLdB ecAk5FYhRMiZSjfkuTYEckbwrQN+8pWZkRCcKHw3lVWp6s/9RjZjryUpZvromkcDOFUXuT5r7Z 73w9nmSCVWwAAAA== X-Change-ID: 20241107-rcu_probe-bef660d84990 To: Masami Hiramatsu , Oleg Nesterov , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Andrii Nakryiko Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, kernel-team@meta.com, Breno Leitao X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1409; i=leitao@debian.org; h=from:subject:message-id; bh=So1ItwFzTb3sOVIA2K0+hbsdqiPV9NaUSDc6GNfHju8=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBnLPXq63gvad8/poLKw+za0lChnG2ApKpuihLRD uDhk9YbyxyJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCZyz16gAKCRA1o5Of/Hh3 bUBcD/4/xrsdxE/e65Z6mOBOIxcTav9O5oPUynAmzoQioBsUi958zhlLAlQ2ZmU6V026Rlf8zAu e8VQnwS04JaUP11KTXbPM0Y6d7XX5GjtTvBJ9MPaRr5s4PQV4d5d2WMy4Lmupi1HhBjSVE5nkc5 x16hW0rS9TUvu0tCqbb7UqllOKNvGX9uR1IkFP8wXWAMiAmp+0xEuUMau51KHZerPfpJdl/9OoV TjzurblklxkHRa+BvLkVzBbaUFqfJKT+vsQuWKUhSxGRyx1Znned6mmlUpHZ0wNLWFemHifN4/o nIdyQ+6lkLjH8/SfKwmFJ6gnXhzD2N2CgUBckRE7rOH96VcFMvYaPaDgOd03XLuQbjYIzSbljja /OX+BtKQQphuAirWufKH/PcXQQaJ4LpoIWnJVFKBheEBGfQuFJe6YztyELKQaqbcP9Ue8VbeT30 Q4VKMj8Ly7TN4ijHslvSxolLUnZOGfITuvr5jnQqlQOlopgNkxgYnRpx2q3l1u1ZFoUF9YEqhPN d5TsP7s70enuHnBlt+8h0BGH0UMfDrrRTPJFkC2poIThvlGVE92WeDyo+Vk7wuy3vU4nDJ2F2vI 3d73wtjoUO/D13NjO2Y666FxZoIe85OmC3fvbmHSVlCttn1zUXMGzppyxAccqFjMb9YBLFxHoKw Yr6c2LOKfoZRu1w== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D Acquire RCU trace lock in filter_chain() to protect list_for_each_entry_rcu() iteration, protecting the list iteration in a RCU read section. Prior to this fix, list_for_each_entry_srcu() was called without holding the required lock, triggering warnings when RCU_PROVING is enabled: kernel/events/uprobes.c:937 RCU-list traversed without holding the require= d lock!! Signed-off-by: Breno Leitao Fixes: cc01bd044e6a ("uprobes: travers uprobe's consumer list locklessly un= der SRCU protection") Acked-by: Andrii Nakryiko Reviewed-by: Andrii Nakryiko --- kernel/events/uprobes.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index fa04b14a7d72353adc440742016b813da6c812d2..afdaa45a43ac3948f7983175eda= 808c989e8738a 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1103,11 +1103,13 @@ static bool filter_chain(struct uprobe *uprobe, str= uct mm_struct *mm) bool ret =3D false; =20 down_read(&uprobe->consumer_rwsem); + rcu_read_lock_trace(); list_for_each_entry_rcu(uc, &uprobe->consumers, cons_node, rcu_read_lock_= trace_held()) { ret =3D consumer_filter(uc, mm); if (ret) break; } + rcu_read_unlock_trace(); up_read(&uprobe->consumer_rwsem); =20 return ret; --- base-commit: 5b913f5d7d7fe0f567dea8605f21da6eaa1735fb change-id: 20241107-rcu_probe-bef660d84990 Best regards, --=20 Breno Leitao