linux-kernel - Re: [PATCH v3 17/28] x86/sgx: fix a NULL pointer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 17 Jul 2023 12:49:27 +0000
From:   "Jarkko Sakkinen" <jarkko@...nel.org>
To:     "Jarkko Sakkinen" <jarkko@...nel.org>,
        "Haitao Huang" <haitao.huang@...ux.intel.com>,
        <dave.hansen@...ux.intel.com>, <tj@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-sgx@...r.kernel.org>,
        <cgroups@...r.kernel.org>, "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>
Cc:     <kai.huang@...el.com>, <reinette.chatre@...el.com>,
        <zhiquan1.li@...el.com>, <kristen@...ux.intel.com>,
        <seanjc@...gle.com>
Subject: Re: [PATCH v3 17/28] x86/sgx: fix a NULL pointer

On Mon Jul 17, 2023 at 12:48 PM UTC, Jarkko Sakkinen wrote:
> On Wed Jul 12, 2023 at 11:01 PM UTC, Haitao Huang wrote:
> > Under heavy load, the SGX EPC reclaimers (ksgxd or future EPC cgroup
> > worker) may reclaim SECS EPC page for an enclave and set
> > encl->secs.epc_page to NULL. But the SECS EPC page is required for EAUG
> > in #PF handler and is used without checking for NULL and reloading.
> >
> > Fix this by checking if SECS is loaded before EAUG and load it if it was
> > reclaimed.
> >
> > Signed-off-by: Haitao Huang <haitao.huang@...ux.intel.com>
>
> A bug fix should be 1/*.

And a fixes tag.

Or is there a bug that is momentized by the earlier patches? This patch
feels confusing to say the least.

BR, Jarkko