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Message-ID: <Y5rsyiDNWp1QLhka@kroah.com> Date: Thu, 15 Dec 2022 10:45:46 +0100 From: Greg KH <gregkh@...uxfoundation.org> To: Lee Jones <lee@...nel.org> Cc: Simon Horman <simon.horman@...igine.com>, Jialiang Wang <wangjialiang0806@....com>, stable@...r.kernel.org, kuba@...nel.org, davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com, niejianglei2021@....com, oss-drivers@...igine.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v3] nfp: fix use-after-free in area_cache_get() On Thu, Dec 15, 2022 at 09:25:23AM +0000, Lee Jones wrote: > Dear Stable, > > [NB: Re-poking Stable with the correct contact address this time! :)] > > > > > area_cache_get() is used to distribute cache->area and set cache->id, > > > > and if cache->id is not 0 and cache->area->kref refcount is 0, it will > > > > release the cache->area by nfp_cpp_area_release(). area_cache_get() > > > > set cache->id before cpp->op->area_init() and nfp_cpp_area_acquire(). > > > > > > > > But if area_init() or nfp_cpp_area_acquire() fails, the cache->id is > > > > is already set but the refcount is not increased as expected. At this > > > > time, calling the nfp_cpp_area_release() will cause use-after-free. > > > > > > > > To avoid the use-after-free, set cache->id after area_init() and > > > > nfp_cpp_area_acquire() complete successfully. > > > > > > > > Note: This vulnerability is triggerable by providing emulated device > > > > equipped with specified configuration. > > > > > > > > BUG: KASAN: use-after-free in nfp6000_area_init (/home/user/Kernel/v5.19 > > > > /x86_64/src/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c:760) > > > > Write of size 4 at addr ffff888005b7f4a0 by task swapper/0/1 > > > > > > > > Call Trace: > > > > <TASK> > > > > nfp6000_area_init (/home/user/Kernel/v5.19/x86_64/src/drivers/net > > > > /ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c:760) > > > > area_cache_get.constprop.8 (/home/user/Kernel/v5.19/x86_64/src/drivers > > > > /net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:884) > > > > > > > > Allocated by task 1: > > > > nfp_cpp_area_alloc_with_name (/home/user/Kernel/v5.19/x86_64/src/drivers > > > > /net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:303) > > > > nfp_cpp_area_cache_add (/home/user/Kernel/v5.19/x86_64/src/drivers/net > > > > /ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:802) > > > > nfp6000_init (/home/user/Kernel/v5.19/x86_64/src/drivers/net/ethernet > > > > /netronome/nfp/nfpcore/nfp6000_pcie.c:1230) > > > > nfp_cpp_from_operations (/home/user/Kernel/v5.19/x86_64/src/drivers/net > > > > /ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:1215) > > > > nfp_pci_probe (/home/user/Kernel/v5.19/x86_64/src/drivers/net/ethernet > > > > /netronome/nfp/nfp_main.c:744) > > > > > > > > Freed by task 1: > > > > kfree (/home/user/Kernel/v5.19/x86_64/src/mm/slub.c:4562) > > > > area_cache_get.constprop.8 (/home/user/Kernel/v5.19/x86_64/src/drivers > > > > /net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:873) > > > > nfp_cpp_read (/home/user/Kernel/v5.19/x86_64/src/drivers/net/ethernet > > > > /netronome/nfp/nfpcore/nfp_cppcore.c:924 /home/user/Kernel/v5.19/x86_64 > > > > /src/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c:973) > > > > nfp_cpp_readl (/home/user/Kernel/v5.19/x86_64/src/drivers/net/ethernet > > > > /netronome/nfp/nfpcore/nfp_cpplib.c:48) > > > > > > > > Signed-off-by: Jialiang Wang <wangjialiang0806@....com> > > > > > > Any reason why this doesn't have a Fixes: tag applied and/or didn't > > > get sent to Stable? > > > > > > Looks as if this needs to go back as far as v4.19. > > > > > > Fixes: 4cb584e0ee7df ("nfp: add CPP access core") > > > > > > commit 02e1a114fdb71e59ee6770294166c30d437bf86a upstream. > > Would you be able to take this with the information provided please? You really want this back to 4.14.y, as 4cb584e0ee7df ("nfp: add CPP access core") showed up in the 4.11 release, right? if so, now queued up. greg k-h
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