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Fri, 08 Jan 2021 17:02:32 -0800 (PST) Received: from [2620:15c:17:3:4a0f:cfff:fe51:6667] ([2620:15c:17:3:4a0f:cfff:fe51:6667]) by smtp.gmail.com with ESMTPSA id 186sm10090171pfx.100.2021.01.08.17.02.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Jan 2021 17:02:31 -0800 (PST) Date: Fri, 8 Jan 2021 17:02:30 -0800 (PST) From: David Rientjes To: Suren Baghdasaryan cc: Minchan Kim , Andrew Morton , Jann Horn , Kees Cook , Jeffrey Vander Stoep , Michal Hocko , Shakeel Butt , =?UTF-8?Q?Edgar_Arriaga_Garc=C3=ADa?= , Tim Murray , linux-mm , selinux@vger.kernel.org, Linux API , LKML , kernel-team Subject: Re: [PATCH 1/1] mm/madvise: replace ptrace attach requirement for process_madvise In-Reply-To: Message-ID: References: <20210108205857.1471269-1-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, 8 Jan 2021, Suren Baghdasaryan wrote: > > > @@ -1197,12 +1197,22 @@ SYSCALL_DEFINE5(process_madvise, int, pidfd, const struct iovec __user *, vec, > > > goto release_task; > > > } > > > > > > - mm = mm_access(task, PTRACE_MODE_ATTACH_FSCREDS); > > > + /* Require PTRACE_MODE_READ to avoid leaking ASLR metadata. */ > > > + mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); > > > if (IS_ERR_OR_NULL(mm)) { > > > ret = IS_ERR(mm) ? PTR_ERR(mm) : -ESRCH; > > > goto release_task; > > > } > > > > > > + /* > > > + * Require CAP_SYS_NICE for influencing process performance. Note that > > > + * only non-destructive hints are currently supported. > > > + */ > > > + if (!capable(CAP_SYS_NICE)) { > > > + ret = -EPERM; > > > + goto release_task; > > > > mmput? > > Ouch! Thanks for pointing it out! Will include in the next respin. > With the fix, feel free to add: Acked-by: David Rientjes Thanks Suren!