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[37.110.38.130]) by smtp.googlemail.com with ESMTPSA id v23sm1843461lfa.5.2020.07.31.03.47.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Jul 2020 03:47:52 -0700 (PDT) From: Denis Efremov To: Julia Lawall Date: Fri, 31 Jul 2020 13:47:30 +0300 Message-Id: <20200731104730.39808-1-efremov@linux.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200605204237.85055-1-efremov@linux.com> References: <20200605204237.85055-1-efremov@linux.com> MIME-Version: 1.0 X-Greylist: Sender IP whitelisted, Sender e-mail whitelisted, not delayed by milter-greylist-4.4.3 (isis.lip6.fr [132.227.60.2]); Fri, 31 Jul 2020 12:47:55 +0200 (CEST) X-Greylist: Sender DNS name whitelisted, not delayed by milter-greylist-4.4.3 (isis.lip6.fr [132.227.60.2]); Fri, 31 Jul 2020 12:47:53 +0200 (CEST) X-Scanned-By: MIMEDefang 2.78 on 132.227.60.2 X-Scanned-By: MIMEDefang 2.78 on 132.227.60.2 Cc: cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org Subject: [Cocci] [PATCH v5] coccinelle: api: add kvfree script X-BeenThere: cocci@systeme.lip6.fr X-Mailman-Version: 2.1.13 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: cocci-bounces@systeme.lip6.fr Errors-To: cocci-bounces@systeme.lip6.fr Check that alloc and free types of functions match each other. Signed-off-by: Denis Efremov --- Changes in v2: - Lines are limited to 80 characters where possible - Confidence changed from High to Medium because of fs/btrfs/send.c:1119 false-positive - __vmalloc_area_node() explicitly excluded from analysis instead of !(file in "mm/vmalloc.c") condition Changes in v3: - prints style in org && report modes changed for python2 Changes in v4: - missing msg argument to print_todo fixed Changes in v5: - fix position p in kfree rule - move @kok and @v positions in choice rule after the arguments - remove kvmalloc suggestions scripts/coccinelle/api/kvfree.cocci | 182 ++++++++++++++++++++++++++++ 1 file changed, 182 insertions(+) create mode 100644 scripts/coccinelle/api/kvfree.cocci diff --git a/scripts/coccinelle/api/kvfree.cocci b/scripts/coccinelle/api/kvfree.cocci new file mode 100644 index 000000000000..e83b1ebbad7e --- /dev/null +++ b/scripts/coccinelle/api/kvfree.cocci @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0-only +/// +/// Check that kvmalloc'ed memory is freed by kfree functions, +/// vmalloc'ed by vfree functions and kvmalloc'ed by kvfree +/// functions. +/// +// Confidence: Medium +// Copyright: (C) 2020 Denis Efremov ISPRAS +// Options: --no-includes --include-headers +// + +virtual patch +virtual report +virtual org +virtual context + +@initialize:python@ +@@ +# low-level memory api +filter = frozenset(['__vmalloc_area_node']) + +def relevant(p): + return not (filter & {el.current_element for el in p}) + +@choice@ +expression E, E1; +position kok, vok; +@@ + +( + if (...) { + ... + E = \(kmalloc\|kzalloc\|krealloc\|kcalloc\| + kmalloc_node\|kzalloc_node\|kmalloc_array\| + kmalloc_array_node\|kcalloc_node\)(...)@kok + ... + } else { + ... + E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\| + vzalloc_node\|vmalloc_exec\|vmalloc_32\| + vmalloc_32_user\|__vmalloc\|__vmalloc_node_range\| + __vmalloc_node\)(...)@vok + ... + } +| + E = \(kmalloc\|kzalloc\|krealloc\|kcalloc\|kmalloc_node\|kzalloc_node\| + kmalloc_array\|kmalloc_array_node\|kcalloc_node\)(...) + ... when != E = E1 + when any + if (\(!E\|E == NULL\)) { + ... + E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\| + vzalloc_node\|vmalloc_exec\|vmalloc_32\| + vmalloc_32_user\|__vmalloc\|__vmalloc_node_range\| + __vmalloc_node\)(...)@vok + ... + } +) + +@vfree depends on !patch@ +expression E; +position k != choice.kok; +position p; +@@ + +* E = \(kmalloc\|kzalloc\|krealloc\|kcalloc\|kmalloc_node\| + kzalloc_node\|kmalloc_array\|kmalloc_array_node\| + kcalloc_node\)(...)@k + ... when != if (...) { ... E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\|vzalloc_node\|vmalloc_exec\|vmalloc_32\|vmalloc_32_user\|__vmalloc\|__vmalloc_node_range\|__vmalloc_node\)(...); ... } + when != is_vmalloc_addr(E) + when any +* \(vfree\|vfree_atomic\|kvfree\)(E)@p + +@pvfree depends on patch exists@ +expression E; +position k != choice.kok; +@@ + + E = \(kmalloc\|kzalloc\|krealloc\|kcalloc\|kmalloc_node\| + kzalloc_node\|kmalloc_array\|kmalloc_array_node\| + kcalloc_node\)(...)@k + ... when != if (...) { ... E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\|vzalloc_node\|vmalloc_exec\|vmalloc_32\|vmalloc_32_user\|__vmalloc\|__vmalloc_node_range\|__vmalloc_node\)(...); ... } + when != is_vmalloc_addr(E) + when any +- \(vfree\|vfree_atomic\|kvfree\)(E) ++ kfree(E) + +@kfree depends on !patch@ +expression E; +position v != choice.vok; +position p; +@@ + +* E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\|vzalloc_node\| + vmalloc_exec\|vmalloc_32\|vmalloc_32_user\|__vmalloc\| + __vmalloc_node_range\|__vmalloc_node\)(...)@v + ... when != !is_vmalloc_addr(E) + when any +* \(kfree\|kzfree\|kvfree\)(E)@p + +@pkfree depends on patch exists@ +expression E; +position v != choice.vok; +@@ + + E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\|vzalloc_node\| + vmalloc_exec\|vmalloc_32\|vmalloc_32_user\|__vmalloc\| + __vmalloc_node_range\|__vmalloc_node\)(...)@v + ... when != !is_vmalloc_addr(E) + when any +- \(kfree\|kvfree\)(E) ++ vfree(E) + +@kvfree depends on !patch@ +expression E; +position p, k; +@@ + +* E = \(kvmalloc\|kvzalloc\|kvcalloc\|kvzalloc_node\|kvmalloc_node\| + kvmalloc_array\)(...)@k + ... when != is_vmalloc_addr(E) + when any +* \(kfree\|kzfree\|vfree\|vfree_atomic\)(E)@p + +@pkvfree depends on patch exists@ +expression E; +@@ + + E = \(kvmalloc\|kvzalloc\|kvcalloc\|kvzalloc_node\|kvmalloc_node\| + kvmalloc_array\)(...) + ... when != is_vmalloc_addr(E) + when any +- \(kfree\|vfree\)(E) ++ kvfree(E) + +@script: python depends on report@ +k << vfree.k; +p << vfree.p; +@@ + +msg = "WARNING: kmalloc is used to allocate this memory at line %s" % (k[0].line) +coccilib.report.print_report(p[0], msg) + +@script: python depends on org@ +k << vfree.k; +p << vfree.p; +@@ + +msg = "WARNING: kmalloc is used to allocate this memory at line %s" % (k[0].line) +coccilib.org.print_todo(p[0], msg) + +@script: python depends on report@ +v << kfree.v; +p << kfree.p; +@@ + +msg = "WARNING: vmalloc is used to allocate this memory at line %s" % (v[0].line) +coccilib.report.print_report(p[0], msg) + +@script: python depends on org@ +v << kfree.v; +p << kfree.p; +@@ + +msg = "WARNING: vmalloc is used to allocate this memory at line %s" % (v[0].line) +coccilib.org.print_todo(p[0], msg) + +@script: python depends on report@ +k << kvfree.k; +p << kvfree.p; +@@ + +msg = "WARNING: kvmalloc is used to allocate this memory at line %s" % (k[0].line) +coccilib.report.print_report(p[0], msg) + +@script: python depends on org@ +k << kvfree.k; +p << kvfree.p; +@@ + +msg = "WARNING: kvmalloc is used to allocate this memory at line %s" % (k[0].line) +coccilib.org.print_todo(p[0], msg) -- 2.26.2 _______________________________________________ Cocci mailing list Cocci@systeme.lip6.fr https://systeme.lip6.fr/mailman/listinfo/cocci