From: John Levon <john.levon@nutanix.com>
To: Ashish Sadanandan <ashish.sadanandan@gmail.com>
Cc: dev@dpdk.org, stable@dpdk.org
Subject: Re: [PATCH v4 1/1] eal/linux: reject mountpt not parent of --huge-dir
Date: Wed, 11 Jan 2023 12:11:05 +0000 [thread overview]
Message-ID: <Y76nWfN7QecpMuSE@movementarian.org> (raw)
In-Reply-To: <20230109015239.3956876-1-ashish.sadanandan@gmail.com>
On Sun, Jan 08, 2023 at 06:52:39PM -0700, Ashish Sadanandan wrote:
> The code added for allowing --huge-dir to specify hugetlbfs
> sub-directories has a bug where it incorrectly matches mounts that
> contain a prefix of the specified --huge-dir.
>
> Consider --huge-dir=/dev/hugepages1G is passed to rte_eal_init. Given
> the following hugetlbfs mounts
>
> $ mount | grep hugetlbfs
> hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
> hugetlbfs on /dev/hugepages1G type hugetlbfs (rw,relatime,pagesize=1024M)
> hugetlbfs on /mnt/huge type hugetlbfs (rw,relatime,pagesize=2M)
>
> get_hugepage_dir is first called with hugepage_sz=2097152. While
> iterating over all mount points, /dev/hugepages is incorrectly
> determined to be a match because it's a prefix of --huge-dir. The caller
> then obtains an exclusive lock on --huge-dir.
>
> In the next call to get_hugepage_dir, hugepage_sz=1073741824. This call
> correctly determines /dev/hugepages1G is a match. The caller again
> attempts to obtain an exclusive lock on --huge-dir and deadlocks because
> it's already holding a lock.
>
> This has been corrected by ensuring any matched mount point is either an
> exact match or a parent path of --huge-dir.
>
> Fixes: 24d5a1ce6b85 ("eal/linux: allow hugetlbfs sub-directories")
> Cc: john.levon@nutanix.com
> Cc: stable@dpdk.org
> Signed-off-by: Ashish Sadanandan <ashish.sadanandan@gmail.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
thanks
john
next prev parent reply other threads:[~2023-01-11 12:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-03 18:57 [PATCH 1/1] eal/linux: reject mountpt shorter than --huge-dir Ashish Sadanandan
2023-01-03 23:53 ` Ashish Sadanandan
2023-01-04 0:00 ` [PATCH v2 1/1] eal/linux: reject --huge-dir not parent of mountpt Ashish Sadanandan
2023-01-04 11:24 ` Dmitry Kozlyuk
2023-01-04 18:17 ` Ashish Sadanandan
2023-01-04 16:22 ` John Levon
2023-01-04 18:17 ` Ashish Sadanandan
2023-01-04 18:17 ` [PATCH v3 " Ashish Sadanandan
2023-01-09 1:52 ` [PATCH v4 1/1] eal/linux: reject mountpt not parent of --huge-dir Ashish Sadanandan
2023-01-11 12:11 ` John Levon [this message]
2023-01-16 18:25 ` Ashish Sadanandan
2023-02-10 11:04 ` David Marchand
2023-02-10 11:01 ` David Marchand
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