Message ID | 20211206150231.2283069-2-Liam.Howlett@oracle.com |
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State | New |
Headers | show
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The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: arch_get_unmapped_area() could potentially allow a larger than possible length when using the MAP_FIXED flag. The bound check should come before the check for MAP_FIXED. Fixes: 5bba49f5397c (ARC: [mm] Aliasing VIPT dcache support 4/4) Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> --- arch/arc/mm/mmap.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions [...] Content analysis details: (-0.9 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [205.220.177.32 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 SPF_NONE SPF: sender does not publish an SPF Record -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [205.220.177.32 listed in wl.mailspike.net] -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors <linux-snps-arc.lists.infradead.org> List-Unsubscribe: <http://lists.infradead.org/mailman/options/linux-snps-arc>, <mailto:linux-snps-arc-request@lists.infradead.org?subject=unsubscribe> List-Archive: <http://lists.infradead.org/pipermail/linux-snps-arc/> List-Post: <mailto:linux-snps-arc@lists.infradead.org> List-Help: <mailto:linux-snps-arc-request@lists.infradead.org?subject=help> List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-snps-arc>, <mailto:linux-snps-arc-request@lists.infradead.org?subject=subscribe> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" <linux-snps-arc-bounces@lists.infradead.org> Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org |
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Check length of unmapped area on MAP_FIXED
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expand
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diff --git a/arch/arc/mm/mmap.c b/arch/arc/mm/mmap.c index 722d26b94307..1d7076406c4e 100644 --- a/arch/arc/mm/mmap.c +++ b/arch/arc/mm/mmap.c @@ -35,6 +35,9 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, int aliasing = cache_is_vipt_aliasing(); struct vm_unmapped_area_info info; + if (len > TASK_SIZE) + return -ENOMEM; + /* * We only need to do colour alignment if D cache aliases. */ @@ -51,9 +54,6 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, return addr; } - if (len > TASK_SIZE) - return -ENOMEM; - if (addr) { if (do_align) addr = COLOUR_ALIGN(addr, pgoff);
arch_get_unmapped_area() could potentially allow a larger than possible length when using the MAP_FIXED flag. The bound check should come before the check for MAP_FIXED. Fixes: 5bba49f5397c (ARC: [mm] Aliasing VIPT dcache support 4/4) Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> --- arch/arc/mm/mmap.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)