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[83.52.55.163]) by smtp.gmail.com with ESMTPSA id f5sm4032824wmb.47.2021.09.03.04.07.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Sep 2021 04:07:28 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH 04/28] accel/tcg: Replace g_memdup() by g_memdup2_qemu() Date: Fri, 3 Sep 2021 13:06:38 +0200 Message-Id: <20210903110702.588291-5-philmd@redhat.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210903110702.588291-1-philmd@redhat.com> References: <20210903110702.588291-1-philmd@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) DKIMWL_WL_HIGH=-0.392, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Peter Maydell , Li Zhijian , "Michael S. Tsirkin" , Jason Wang , Christian Schoenebeck , Yuval Shaia , Peter Xu , Gerd Hoffmann , Alexandre Iooss , Eric Blake , qemu-block@nongnu.org, Zhang Chen , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Helge Deller , David Hildenbrand , Markus Armbruster , "Gonglei \(Arei\)" , Stefan Weil , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Laurent Vivier , Thomas Huth , Eduardo Habkost , Michael Roth , Richard Henderson , Greg Kurz , Alex Williamson , qemu-arm@nongnu.org, Paolo Bonzini , John Snow , David Gibson , Kevin Wolf , Vladimir Sementsov-Ogievskiy , Laurent Vivier , Shannon Zhao , Hanna Reitz , qemu-ppc@nongnu.org, Igor Mammedov , Mahmoud Mandour Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Per https://discourse.gnome.org/t/port-your-module-from-g-memdup-to-g-memdup2-now/5538 The old API took the size of the memory to duplicate as a guint, whereas most memory functions take memory sizes as a gsize. This made it easy to accidentally pass a gsize to g_memdup(). For large values, that would lead to a silent truncation of the size from 64 to 32 bits, and result in a heap area being returned which is significantly smaller than what the caller expects. This can likely be exploited in various modules to cause a heap buffer overflow. Replace g_memdup() by the safer g_memdup2_qemu() wrapper. Signed-off-by: Philippe Mathieu-Daudé --- accel/tcg/cputlb.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c index b1e5471f949..1d5069a30d1 100644 --- a/accel/tcg/cputlb.c +++ b/accel/tcg/cputlb.c @@ -826,7 +826,7 @@ void tlb_flush_range_by_mmuidx(CPUState *cpu, target_ulong addr, tlb_flush_range_by_mmuidx_async_0(cpu, d); } else { /* Otherwise allocate a structure, freed by the worker. */ - TLBFlushRangeData *p = g_memdup(&d, sizeof(d)); + TLBFlushRangeData *p = g_memdup2_qemu(&d, sizeof(d)); async_run_on_cpu(cpu, tlb_flush_range_by_mmuidx_async_1, RUN_ON_CPU_HOST_PTR(p)); } @@ -868,7 +868,7 @@ void tlb_flush_range_by_mmuidx_all_cpus(CPUState *src_cpu, /* Allocate a separate data block for each destination cpu. */ CPU_FOREACH(dst_cpu) { if (dst_cpu != src_cpu) { - TLBFlushRangeData *p = g_memdup(&d, sizeof(d)); + TLBFlushRangeData *p = g_memdup2_qemu(&d, sizeof(d)); async_run_on_cpu(dst_cpu, tlb_flush_range_by_mmuidx_async_1, RUN_ON_CPU_HOST_PTR(p)); @@ -918,13 +918,13 @@ void tlb_flush_range_by_mmuidx_all_cpus_synced(CPUState *src_cpu, /* Allocate a separate data block for each destination cpu. */ CPU_FOREACH(dst_cpu) { if (dst_cpu != src_cpu) { - p = g_memdup(&d, sizeof(d)); + p = g_memdup2_qemu(&d, sizeof(d)); async_run_on_cpu(dst_cpu, tlb_flush_range_by_mmuidx_async_1, RUN_ON_CPU_HOST_PTR(p)); } } - p = g_memdup(&d, sizeof(d)); + p = g_memdup2_qemu(&d, sizeof(d)); async_safe_run_on_cpu(src_cpu, tlb_flush_range_by_mmuidx_async_1, RUN_ON_CPU_HOST_PTR(p)); } -- 2.31.1