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Sun, 10 May 2026 10:05:23 -0700 (PDT) Date: Mon, 11 May 2026 02:05:19 +0900 From: Hyunwoo Kim To: Jakub Kicinski Cc: dhowells@redhat.com, marc.dionne@auristor.com, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, horms@kernel.org, qingfang.deng@linux.dev, jiayuan.chen@linux.dev, linux-afs@lists.infradead.org, netdev@vger.kernel.org, stable@vger.kernel.org, imv4bel@gmail.com Subject: Re: [PATCH net v3] rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present Message-ID: References: <20260510084520.476745b5@kernel.org> <20260510100310.230b15ed@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260510100310.230b15ed@kernel.org> On Sun, May 10, 2026 at 10:03:10AM -0700, Jakub Kicinski wrote: > On Mon, 11 May 2026 01:48:39 +0900 Hyunwoo Kim wrote: > > On Sun, May 10, 2026 at 08:45:20AM -0700, Jakub Kicinski wrote: > > > On Fri, 8 May 2026 17:53:09 +0900 Hyunwoo Kim wrote: > > > > sp->hdr.securityIndex != 0 && > > > > - skb_cloned(skb)) { > > > > + (skb_cloned(skb) || > > > > + skb_has_frag_list(skb) || > > > > + skb_has_shared_frag(skb))) { > > > > > > We seem to be getting a lot of fixes for this issue, and this one is > > > incorrect :| Writing to _any_ frags is incorrect. You have to copy > > > if skb is not linear. skb_ensure_writable() > > > > I was testing a patch based on skb_ensure_writable() but it seems v3 > > has just been merged to mainline... > > > > What would be the best way to proceed? > > Depends on the tree. Where was it merged? That's the torvalds tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71