From: Vlastimil Babka <vbabka@suse.cz> To: Ben Hutchings <ben@decadent.org.uk>, stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, Jann Horn <jannh@google.com>, Ben Hutchings <ben.hutchings@codethink.co.uk>, xen-devel@lists.xenproject.org, Oscar Salvador <osalvador@suse.de>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Juergen Gross <jgross@suse.com>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Vitaly Kuznetsov <vkuznets@redhat.com>, Linus Torvalds <torvalds@linux-foundation.org>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, Andy Lutomirski <luto@kernel.org> Subject: Re: [PATCH STABLE 4.9] x86, mm, gup: prevent get_page() race with munmap in paravirt guest Date: Mon, 23 Sep 2019 10:48:04 +0200 [thread overview] Message-ID: <78bbba27-81ed-40db-eb6e-5add997b2027@suse.cz> (raw) In-Reply-To: <d3bb280b405d6acf0bc4176d63639201ff62853f.camel@decadent.org.uk> On 9/19/19 8:26 PM, Ben Hutchings wrote: > On Mon, 2019-08-19 at 18:58 +0100, Vlastimil Babka wrote: > [...] >> Hi, I'm sending this stable-only patch for consideration because it's probably >> unrealistic to backport the 4.13 switch to generic GUP. I can look at 4.4 and >> 3.16 if accepted. The RCU page table freeing could be also considered. > > I would be interested in backports for 3.16 and 4.4. > >> Note the patch also includes page refcount protection. I found out that >> 8fde12ca79af ("mm: prevent get_user_pages() from overflowing page refcount") >> backport to 4.9 missed the arch-specific gup implementations: >> https://lore.kernel.org/lkml/6650323f-dbc9-f069-000b-f6b0f941a065@suse.cz/ > [...] > > I suppose that still needs to be addressed for 4.9, right? Yeah, I'll take a look, thanks for reminding. > Ben. >
WARNING: multiple messages have this Message-ID (diff)
From: Vlastimil Babka <vbabka@suse.cz> To: Ben Hutchings <ben@decadent.org.uk>, stable@vger.kernel.org Cc: Juergen Gross <jgross@suse.com>, Ben Hutchings <ben.hutchings@codethink.co.uk>, Dave Hansen <dave.hansen@linux.intel.com>, Jann Horn <jannh@google.com>, Peter Zijlstra <peterz@infradead.org>, x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, xen-devel@lists.xenproject.org, Thomas Gleixner <tglx@linutronix.de>, Linus Torvalds <torvalds@linux-foundation.org>, Vitaly Kuznetsov <vkuznets@redhat.com>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Oscar Salvador <osalvador@suse.de> Subject: Re: [Xen-devel] [PATCH STABLE 4.9] x86, mm, gup: prevent get_page() race with munmap in paravirt guest Date: Mon, 23 Sep 2019 10:48:04 +0200 [thread overview] Message-ID: <78bbba27-81ed-40db-eb6e-5add997b2027@suse.cz> (raw) In-Reply-To: <d3bb280b405d6acf0bc4176d63639201ff62853f.camel@decadent.org.uk> On 9/19/19 8:26 PM, Ben Hutchings wrote: > On Mon, 2019-08-19 at 18:58 +0100, Vlastimil Babka wrote: > [...] >> Hi, I'm sending this stable-only patch for consideration because it's probably >> unrealistic to backport the 4.13 switch to generic GUP. I can look at 4.4 and >> 3.16 if accepted. The RCU page table freeing could be also considered. > > I would be interested in backports for 3.16 and 4.4. > >> Note the patch also includes page refcount protection. I found out that >> 8fde12ca79af ("mm: prevent get_user_pages() from overflowing page refcount") >> backport to 4.9 missed the arch-specific gup implementations: >> https://lore.kernel.org/lkml/6650323f-dbc9-f069-000b-f6b0f941a065@suse.cz/ > [...] > > I suppose that still needs to be addressed for 4.9, right? Yeah, I'll take a look, thanks for reminding. > Ben. > _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
next prev parent reply other threads:[~2019-09-23 8:48 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-02 16:06 [PATCH STABLE 4.9] x86, mm, gup: prevent get_page() race with munmap in paravirt guest Vlastimil Babka 2019-08-02 16:06 ` [Xen-devel] " Vlastimil Babka 2019-08-05 11:58 ` Greg KH 2019-08-05 11:58 ` [Xen-devel] " Greg KH 2019-08-05 12:25 ` Patch "x86, mm, gup: prevent get_page() race with munmap in paravirt guest" has been added to the 4.9-stable tree gregkh 2019-08-05 12:25 ` [Xen-devel] " gregkh 2019-09-19 18:26 ` [PATCH STABLE 4.9] x86, mm, gup: prevent get_page() race with munmap in paravirt guest Ben Hutchings 2019-09-19 18:26 ` [Xen-devel] " Ben Hutchings 2019-09-19 18:26 ` Ben Hutchings 2019-09-23 8:48 ` Vlastimil Babka [this message] 2019-09-23 8:48 ` [Xen-devel] " Vlastimil Babka 2019-11-06 17:18 ` Vlastimil Babka 2019-11-06 17:18 ` [Xen-devel] " Vlastimil Babka
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