From: Christoph Hellwig <hch@lst.de>
To: Andy Gross <agross@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konrad.dybcio@linaro.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Andrew Morton <akpm@linux-foundation.org>,
Uladzislau Rezki <urezki@gmail.com>
Cc: linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
iommu@lists.linux.dev
Subject: [PATCH 2/2] vmalloc: reject vmap with VM_FLUSH_RESET_PERMS
Date: Fri, 23 Dec 2022 10:27:03 +0100 [thread overview]
Message-ID: <20221223092703.61927-3-hch@lst.de> (raw)
In-Reply-To: <20221223092703.61927-1-hch@lst.de>
VM_FLUSH_RESET_PERMS is just for use with vmalloc as it is tied to freeing
the underlying pages.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
mm/vmalloc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 9e30f0b3920325..88a644cde9fb12 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2849,6 +2849,9 @@ void *vmap(struct page **pages, unsigned int count,
might_sleep();
+ if (WARN_ON_ONCE(flags & VM_FLUSH_RESET_PERMS))
+ return NULL;
+
/*
* Your top guard is someone else's bottom guard. Not having a top
* guard compromises someone else's mappings too.
--
2.35.1
next prev parent reply other threads:[~2022-12-23 9:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-23 9:27 revert dma-mapping and vmap API abuse in qcom_q6v5_mss Christoph Hellwig
2022-12-23 9:27 ` [PATCH 1/2] Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use" Christoph Hellwig
2022-12-23 14:47 ` Manivannan Sadhasivam
2022-12-23 14:57 ` Christoph Hellwig
2022-12-23 15:40 ` Manivannan Sadhasivam
2022-12-23 15:51 ` Christoph Hellwig
2022-12-23 9:27 ` Christoph Hellwig [this message]
2022-12-23 10:24 ` [PATCH 2/2] vmalloc: reject vmap with VM_FLUSH_RESET_PERMS Lorenzo Stoakes
2022-12-23 14:03 ` Christoph Hellwig
2022-12-23 14:10 ` Lorenzo Stoakes
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