linux-kernel - Re: [PATCH v8] x86/sgx: Maintain encl->refcount for each encl->mm

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Message-ID: <41238875-988f-fbb1-af2b-2e667ba8861d@intel.com>
Date:   Sun, 7 Feb 2021 14:37:17 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>, linux-sgx@...r.kernel.org
Cc:     Haitao Huang <haitao.huang@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Jethro Beekman <jethro@...tanix.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8] x86/sgx: Maintain encl->refcount for each
 encl->mm_list entry

> This has been shown in tests:
> 
> [  +0.000008] WARNING: CPU: 3 PID: 7620 at kernel/rcu/srcutree.c:374 cleanup_srcu_struct+0xed/0x100
> 
> This is essentially a use-after free, although SRCU notices it as
> an SRCU cleanup in an invalid context.
...

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com