[PATCH v3] nfp: fix use-after-free in area_cache_get()

[PATCH v3] nfp: fix use-after-free in area_cache_get()

[Jialiang Wang]

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@163.com>
---
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
index 34c0d2ddf9ef..a8286d0032d1 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
@@ -874,7 +874,6 @@ area_cache_get(struct nfp_cpp *cpp, u32 id,
 	}
 
 	/* Adjust the start address to be cache size aligned */
-	cache->id = id;
 	cache->addr = addr & ~(u64)(cache->size - 1);
 
 	/* Re-init to the new ID and address */
@@ -894,6 +893,8 @@ area_cache_get(struct nfp_cpp *cpp, u32 id,
 		return NULL;
 	}
 
+	cache->id = id;
+
 exit:
 	/* Adjust offset */
 	*offset = addr - cache->addr;
-- 
2.17.1

RE: [PATCH v3] nfp: fix use-after-free in area_cache_get()

[Yinjun Zhang]

On Wed, 10 Aug 2022 15:30:57 +0800 Jialiang Wang wrote:
> 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:7
> 60)
>   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@163.com>

Thanks.
Reviewed-by: Yinjun Zhang <yinjun.zhang@corigine.com>

Re: [PATCH v3] nfp: fix use-after-free in area_cache_get()

[Simon Horman]

On Thu, Aug 11, 2022 at 05:10:44AM +0100, Yinjun Zhang wrote:
> On Wed, 10 Aug 2022 15:30:57 +0800 Jialiang Wang wrote:
> > 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:7
> > 60)
> >   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@163.com>
> 
> Thanks.
> Reviewed-by: Yinjun Zhang <yinjun.zhang@corigine.com>

Acked-by: Simon Horman <simon.horman@corigine.com>

Re: [PATCH v3] nfp: fix use-after-free in area_cache_get()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 10 Aug 2022 15:30:57 +0800 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [v3] nfp: fix use-after-free in area_cache_get()
    https://git.kernel.org/netdev/net/c/02e1a114fdb7

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [PATCH v3] nfp: fix use-after-free in area_cache_get()

[Lee Jones]

On Wed, 10 Aug 2022, Jialiang Wang wrote:

> 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@163.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.

> ---
>  drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
> index 34c0d2ddf9ef..a8286d0032d1 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
> +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
> @@ -874,7 +874,6 @@ area_cache_get(struct nfp_cpp *cpp, u32 id,
>  	}
>  
>  	/* Adjust the start address to be cache size aligned */
> -	cache->id = id;
>  	cache->addr = addr & ~(u64)(cache->size - 1);
>  
>  	/* Re-init to the new ID and address */
> @@ -894,6 +893,8 @@ area_cache_get(struct nfp_cpp *cpp, u32 id,
>  		return NULL;
>  	}
>  
> +	cache->id = id;
> +
>  exit:
>  	/* Adjust offset */
>  	*offset = addr - cache->addr;

-- 
Lee Jones [李琼斯]

Re: [PATCH v3] nfp: fix use-after-free in area_cache_get()

[Simon Horman]

On Wed, Dec 07, 2022 at 12:21:10PM +0000, Lee Jones wrote:
> [Some people who received this message don't often get email from lee@kernel.org. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> On Wed, 10 Aug 2022, Jialiang Wang wrote:
> 
> > 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@163.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.

Hi Lee,

From my side this looks like an oversight.

> > ---
> >  drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
> > index 34c0d2ddf9ef..a8286d0032d1 100644
> > --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
> > +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
> > @@ -874,7 +874,6 @@ area_cache_get(struct nfp_cpp *cpp, u32 id,
> >       }
> >
> >       /* Adjust the start address to be cache size aligned */
> > -     cache->id = id;
> >       cache->addr = addr & ~(u64)(cache->size - 1);
> >
> >       /* Re-init to the new ID and address */
> > @@ -894,6 +893,8 @@ area_cache_get(struct nfp_cpp *cpp, u32 id,
> >               return NULL;
> >       }
> >
> > +     cache->id = id;
> > +
> >  exit:
> >       /* Adjust offset */
> >       *offset = addr - cache->addr;
> 
> --
> Lee Jones [李琼斯]

Re: [PATCH v3] nfp: fix use-after-free in area_cache_get()

[Lee Jones]

Dear Stable,

On Thu, 08 Dec 2022, Simon Horman wrote:
> On Wed, Dec 07, 2022 at 12:21:10PM +0000, Lee Jones wrote:
> > [Some people who received this message don't often get email from lee@kernel.org. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> > 
> > On Wed, 10 Aug 2022, Jialiang Wang wrote:
> > 
> > > 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@163.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.
> 
> Hi Lee,
> 
> From my side this looks like an oversight.

Understood, thank you Simon.

Stable Team, are you prepared to take this patch with the above info?

-- 
Lee Jones [李琼斯]

Re: [PATCH v3] nfp: fix use-after-free in area_cache_get()

[Lee Jones]

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@163.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?

-- 
Lee Jones [李琼斯]

Re: [PATCH v3] nfp: fix use-after-free in area_cache_get()

[Greg KH]

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@163.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

Re: [PATCH v3] nfp: fix use-after-free in area_cache_get()

[Lee Jones]

On Thu, 15 Dec 2022, Greg KH wrote:

> 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@163.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?

Yes please.  Brain said one thing, fingers typed another!

> if so, now queued up.

Thank you.

-- 
Lee Jones [李琼斯]