Re: [PATCH] dma-buf: add kernel count for dma_buf

From: Guangming.Cao On Wed, 2021-07-14 at 14:28 +0200, Christian König wrote: > Am 14.07.21 um 14:03 schrieb guangming@mediatek.com: > > From: Guangming.Cao > > > > On Wed, 2021-07-14 at 12:43 +0200, Christian K鰊ig wrote: > > > Am 14.07.21 um 11:44 schrieb guangming@mediatek.com: > > >

Re: [PATCH] dma-buf: add kernel count for dma_buf

Am 14.07.21 um 14:03 schrieb guangming@mediatek.com: From: Guangming.Cao On Wed, 2021-07-14 at 12:43 +0200, Christian K鰊ig wrote: Am 14.07.21 um 11:44 schrieb guangming@mediatek.com: From: Guangming Cao On Wed, 2021-07-14 at 10:46 +0200, Christian K鰊ig wrote: Am 14.07.21 um 09:11 s

Re: [PATCH] dma-buf: add kernel count for dma_buf

From: Guangming.Cao On Wed, 2021-07-14 at 12:43 +0200, Christian K鰊ig wrote: > Am 14.07.21 um 11:44 schrieb guangming@mediatek.com: > > From: Guangming Cao > > > > On Wed, 2021-07-14 at 10:46 +0200, Christian K鰊ig wrote: > > > Am 14.07.21 um 09:11 schrieb guangming@mediatek.com: > > > >

Re: [PATCH] dma-buf: add kernel count for dma_buf

On Wed, 2021-07-14 at 12:43 +0200, Christian König wrote: > Am 14.07.21 um 11:44 schrieb guangming@mediatek.com: > > From: Guangming Cao > > > > On Wed, 2021-07-14 at 10:46 +0200, Christian König wrote: > > > Am 14.07.21 um 09:11 schrieb guangming@mediatek.com: > > > > From: Guangming Cao

Re: [PATCH] dma-buf: add kernel count for dma_buf

On Wed, 2021-07-14 at 10:46 +0200, Christian König wrote: > Am 14.07.21 um 09:11 schrieb guangming@mediatek.com: > > From: Guangming Cao > > > > Add a refcount for kernel to prevent UAF(Use After Free) issue. > > Well NAK on so many levels. > > > > > We can assume a case like below: > >

Re: [PATCH] dma-buf: add kernel count for dma_buf

Am 14.07.21 um 09:11 schrieb guangming@mediatek.com: From: Guangming Cao Add a refcount for kernel to prevent UAF(Use After Free) issue. Well NAK on so many levels. We can assume a case like below: 1. kernel space alloc dma_buf(file count = 1) 2. kernel use dma_buf to get fd(