From: Donet Tom <donettom@linux.ibm.com>
To: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Muchun Song <muchun.song@linux.dev>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Ritesh Harjani <ritesh.list@gmail.com>,
Mike Rapoport <rppt@kernel.org>,
David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Tony Battersby <tonyb@cybernetics.com>,
"Aneesh Kumar K . V" <aneesh.kumar@kernel.org>,
Nicholas Piggin <npiggin@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
jj@black.fi.intel.com
Subject: Re: [PATCH] fs/hugetlbfs/inode.c: Ensure generic_hugetlb_get_unmapped_area() returns higher address than mmap_min_addr
Date: Fri, 5 Jul 2024 22:18:01 +0530 [thread overview]
Message-ID: <ed11cb24-acc6-4d1d-a559-0708cdc4786b@linux.ibm.com> (raw)
In-Reply-To: <n5jwq5uq3hrgu3ksyg34tjtl3hw5izpc5s5lac4pkjfjt2tf22@co5rgjcznsma>
On 7/5/24 17:53, Kirill A . Shutemov wrote:
> On Fri, Jul 05, 2024 at 02:11:50AM -0500, Donet Tom wrote:
>> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
>> index 412f295acebe..428fd2f0e4c4 100644
>> --- a/fs/hugetlbfs/inode.c
>> +++ b/fs/hugetlbfs/inode.c
>> @@ -228,7 +228,7 @@ generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
>>
>> if (len & ~huge_page_mask(h))
>> return -EINVAL;
>> - if (len > TASK_SIZE)
>> + if (len > mmap_end - mmap_min_addr)
>> return -ENOMEM;
>>
>> if (flags & MAP_FIXED) {
>> @@ -240,7 +240,7 @@ generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
>> if (addr) {
>> addr = ALIGN(addr, huge_page_size(h));
>> vma = find_vma(mm, addr);
>> - if (mmap_end - len >= addr &&
>> + if (mmap_end - len >= addr && addr >= mmap_min_addr &&
>> (!vma || addr + len <= vm_start_gap(vma)))
>> return addr;
>> }
> There's more difference with generic_get_unmapped_area() than what you are
> fixing. I think we also need vm_end_gap() here.
Thank you for your comment. I will add this change and send V2.
-Donet
>
> Hugetlb code duplication is annoying.
>
prev parent reply other threads:[~2024-07-05 16:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-05 7:11 Donet Tom
2024-07-05 12:23 ` Kirill A . Shutemov
2024-07-05 16:48 ` Donet Tom [this message]
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