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Sat, 15 Feb 2020 12:50:18 +0100 From: Jan Kiszka To: Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org Subject: [PATCH v2 3/3] riscv: Fix crash when flushing executable ioremap regions Date: Sat, 15 Feb 2020 12:49:44 +0100 Message-Id: <8a555b0b0934f0ba134de92f6cf9db8b1744316c.1581767384.git.jan.kiszka@web.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: References: In-Reply-To: References: X-Provags-ID: V03:K1:3afGuyjXHZCaYg9y6mqcxZGBFQUaKdU7SqI4fBIhgjLUotUcjdu VuaSdTlCtsF3UnKqxPCCuX3NSTqYet+hsYgyVjRvAtcglfc77wGgfKg+q7l0b+vgEzSXcNM CiUzO8c4RrB3QFdyLZ+qc7PDN/+V1/qFsrrpPM56toO4IU9MQKuZcZYGhSJu63JCbKnsU7S ZlR79w+tspHae7bOSXjzA== X-UI-Out-Filterresults: notjunk:1;V03:K0:+JySpZD7Yok=:62+NnABRoebGkDXmyK+Xd0 eIJzRv8R5y2HGLiph7dktdAh0js3t0mQv4c2wcwhvcmveAgBoNukvjArwWPZ1xJizFVJSnpMA T3RUtWXubYB/CYg5SHFgKRGYO8kTC75cQJaYw+oBcwlpmV2yQiDH6PdhAQTv2bPn6AkLWfYjK GU26KrfV5KMVSaVaufxWdY3bi99mEUq8hXTHCXUh8OfKs/NBUOUW3KFjUzncjXh7Ma6mNvSiy lv6sWnRtg4Qi8LnQcsI3NpGtbZGsOC60A11lgT5qj71vAlzawDn+u69zhg0WLvEfCdT/2yGHU aHnGP9/660kNYKEk9c4Pkwph32RGBzxYJjJOP3Bx238unJ2wV4f0K+WZwz8lCjdO7PTA28Qol vgFFah1+fg+aCriLfS7xuW7C6PgBAD/I7APg7Gb4N4ZOAysN/JI/Yfz8j3QlR6ljh1jBkkwjC QY1hyt0n/Qs+VluYFX08NJ3PNxcXiT6xLZ+dK/NRyRBGio0DrsWe41Uqghs7sVF+w2l5lck2F 8DsI1A7BRs2MsRgSWgVHIB/UjhePROJOHNx2Wb08qblh9aODzTVOGiuj0E/NXWHZm6vlrOsOm e/ylsWEdqfuFKzLEuweXpenDl2TS1ZePSQY8dMvxg/kbD4FEZo0pAcNnJ44re6chXxgmUMw7j pyg3ubd9Lc1lMdFVzsp/bJe8LdMvAFDecJbuti4Q7zUOaOd+IYXBjYSLAzpMbaY3TZuU6pmrB n+52WvX0fvou7EHsREhNu3GyLkDjCTfXzEm/Mlw69mD0SXd14nyhKG/uzHTrcPqMBZDP7J0Q+ 4iVMRbrN3FV6h+nfYMSz3uRXd0zETqklRNxTKx17xU4nXt5NWCijmijRpf4f/AyaWfFNBp3bL LtncCTLT/I7qQiZnMPX2L+GRblBVV76VcrRmalGL4LI1tOm3gEJZNCxsDwKLSwt/oaxDMfcMS GUoeUQfkBWDgzNNocWAgBXSuoD73Z/Iev5BHmUT1vmhlnDjrOSdAwfJcMo6sj5U0ppwO5lPjf MALXxYkWxyEbSflZGkm4CyRibJAi04OzvUx3hWG3Y20yo/FYzktlMa6rItC0XGD2VdDwnewcw I0GqOgNfqJ9eM04gNnTxnw52AkI+NWe/HTdAjDHheGoKPX+oIlVB5OY7eYiI324KrPPOQ8byj PE4SKupY9fqqQYl4CwUV7f02ljqg01s5bW86QGrwBrd09KzWfqJ6BJ2gz/CIEAKGLY+oNlxPq gqLhcti884KhbRp+y Content-Transfer-Encoding: quoted-printable X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200215_035027_588636_93327AC3 X-CRM114-Status: UNSURE ( 7.72 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org From: Jan Kiszka Those are not backed by page structs, and pte_page is returning an invalid pointer. Signed-off-by: Jan Kiszka =2D-- arch/riscv/mm/cacheflush.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c index 8930ab7278e6..9ee2c1a387cc 100644 =2D-- a/arch/riscv/mm/cacheflush.c +++ b/arch/riscv/mm/cacheflush.c @@ -84,7 +84,8 @@ void flush_icache_pte(pte_t pte) { struct page *page =3D pte_page(pte); - if (!test_and_set_bit(PG_dcache_clean, &page->flags)) + if (!pfn_valid(pte_pfn(pte)) || + !test_and_set_bit(PG_dcache_clean, &page->flags)) flush_icache_all(); } #endif /* CONFIG_MMU */ =2D- 2.16.4