From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nicolin Chen Date: Mon, 31 Aug 2020 20:38:05 +0000 Subject: [RESEND][PATCH 1/7] powerpc/iommu: Avoid overflow at boundary_size Message-Id: <20200831203811.8494-2-nicoleotsuka@gmail.com> List-Id: References: <20200831203811.8494-1-nicoleotsuka@gmail.com> In-Reply-To: <20200831203811.8494-1-nicoleotsuka@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, rth@twiddle.net, ink@jurassic.park.msu.ru, mattst88@gmail.com, tony.luck@intel.com, fenghua.yu@intel.com, schnelle@linux.ibm.com, gerald.schaefer@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, James.Bottomley@HansenPartnership.com, deller@gmx.de Cc: sfr@canb.auug.org.au, hch@lst.de, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-parisc@vger.kernel.org The boundary_size might be as large as ULONG_MAX, which means that a device has no specific boundary limit. So either "+ 1" or passing it to ALIGN() would potentially overflow. According to kernel defines: #define ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask)) #define ALIGN(x, a) ALIGN_MASK(x, (typeof(x))(a) - 1) We can simplify the logic here: ALIGN(boundary + 1, 1 << shift) >> shift = ALIGN_MASK(b + 1, (1 << s) - 1) >> s = {[b + 1 + (1 << s) - 1] & ~[(1 << s) - 1]} >> s = [b + 1 + (1 << s) - 1] >> s = [b + (1 << s)] >> s = (b >> s) + 1 So fixing a potential overflow with the safer shortcut. Reported-by: Stephen Rothwell Signed-off-by: Nicolin Chen Cc: Christoph Hellwig --- arch/powerpc/kernel/iommu.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index 9704f3f76e63..c01ccbf8afdd 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -236,15 +236,14 @@ static unsigned long iommu_range_alloc(struct device *dev, } } - if (dev) - boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, - 1 << tbl->it_page_shift); - else - boundary_size = ALIGN(1UL << 32, 1 << tbl->it_page_shift); /* 4GB boundary for iseries_hv_alloc and iseries_hv_map */ + boundary_size = dev ? dma_get_seg_boundary(dev) : U32_MAX; + + /* Overflow-free shortcut for: ALIGN(b + 1, 1 << s) >> s */ + boundary_size = (boundary_size >> tbl->it_page_shift) + 1; n = iommu_area_alloc(tbl->it_map, limit, start, npages, tbl->it_offset, - boundary_size >> tbl->it_page_shift, align_mask); + boundary_size, align_mask); if (n = -1) { if (likely(pass = 0)) { /* First try the pool from the start */ -- 2.17.1