From: Shyam Saini <mayhs11saini@gmail.com> To: kernel-hardening@lists.openwall.com Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Shyam Saini <mayhs11saini@gmail.com>, Christoph Hellwig <hch@lst.de>, Marek Szyprowski <m.szyprowski@samsung.com>, Robin Murphy <robin.murphy@arm.com>, Matthew Wilcox <willy@infradead.org>, Christopher Lameter <cl@linux.com>, Kees Cook <keescook@chromium.org> Subject: [PATCH] kernel: dma: Make CMA boot parameters __ro_after_init Date: Sat, 12 Oct 2019 17:59:18 +0530 [thread overview] Message-ID: <20191012122918.8066-1-mayhs11saini@gmail.com> (raw) This parameters are not changed after early boot. By making them __ro_after_init will reduce any attack surface in the kernel. Link: https://lwn.net/Articles/676145/ Cc: Christoph Hellwig <hch@lst.de> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Christopher Lameter <cl@linux.com> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Shyam Saini <mayhs11saini@gmail.com> --- kernel/dma/contiguous.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index 69cfb4345388..1b689b1303cd 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -42,10 +42,10 @@ struct cma *dma_contiguous_default_area; * Users, who want to set the size of global CMA area for their system * should use cma= kernel parameter. */ -static const phys_addr_t size_bytes = (phys_addr_t)CMA_SIZE_MBYTES * SZ_1M; -static phys_addr_t size_cmdline = -1; -static phys_addr_t base_cmdline; -static phys_addr_t limit_cmdline; +static const phys_addr_t __ro_after_init size_bytes = (phys_addr_t)CMA_SIZE_MBYTES * SZ_1M; +static phys_addr_t __ro_after_init size_cmdline = -1; +static phys_addr_t __ro_after_init base_cmdline; +static phys_addr_t __ro_after_init limit_cmdline; static int __init early_cma(char *p) { -- 2.20.1
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From: Shyam Saini <mayhs11saini@gmail.com> To: kernel-hardening@lists.openwall.com Cc: Kees Cook <keescook@chromium.org>, linux-kernel@vger.kernel.org, Matthew Wilcox <willy@infradead.org>, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Shyam Saini <mayhs11saini@gmail.com>, Christopher Lameter <cl@linux.com>, Robin Murphy <robin.murphy@arm.com>, Christoph Hellwig <hch@lst.de> Subject: [PATCH] kernel: dma: Make CMA boot parameters __ro_after_init Date: Sat, 12 Oct 2019 17:59:18 +0530 [thread overview] Message-ID: <20191012122918.8066-1-mayhs11saini@gmail.com> (raw) This parameters are not changed after early boot. By making them __ro_after_init will reduce any attack surface in the kernel. Link: https://lwn.net/Articles/676145/ Cc: Christoph Hellwig <hch@lst.de> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Christopher Lameter <cl@linux.com> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Shyam Saini <mayhs11saini@gmail.com> --- kernel/dma/contiguous.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index 69cfb4345388..1b689b1303cd 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -42,10 +42,10 @@ struct cma *dma_contiguous_default_area; * Users, who want to set the size of global CMA area for their system * should use cma= kernel parameter. */ -static const phys_addr_t size_bytes = (phys_addr_t)CMA_SIZE_MBYTES * SZ_1M; -static phys_addr_t size_cmdline = -1; -static phys_addr_t base_cmdline; -static phys_addr_t limit_cmdline; +static const phys_addr_t __ro_after_init size_bytes = (phys_addr_t)CMA_SIZE_MBYTES * SZ_1M; +static phys_addr_t __ro_after_init size_cmdline = -1; +static phys_addr_t __ro_after_init base_cmdline; +static phys_addr_t __ro_after_init limit_cmdline; static int __init early_cma(char *p) { -- 2.20.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next reply other threads:[~2019-10-12 12:32 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-10-12 12:29 Shyam Saini [this message] 2019-10-12 12:29 ` [PATCH] kernel: dma: Make CMA boot parameters __ro_after_init Shyam Saini 2019-10-14 2:25 ` Nathan Chancellor 2019-10-14 2:25 ` Nathan Chancellor 2019-10-16 10:11 ` Shyam Saini 2019-10-16 10:11 ` Shyam Saini 2019-10-16 10:11 ` Shyam Saini 2019-10-14 14:33 ` Robin Murphy 2019-10-14 14:33 ` Robin Murphy 2019-10-19 5:37 ` Shyam Saini 2019-10-19 5:37 ` Shyam Saini 2019-10-19 5:37 ` Shyam Saini
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