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Wed, 13 Jul 2022 09:53:19 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 85606300110; Wed, 13 Jul 2022 11:53:15 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 6E4B6201ECFBD; Wed, 13 Jul 2022 11:53:15 +0200 (CEST) Date: Wed, 13 Jul 2022 11:53:15 +0200 From: Peter Zijlstra To: Song Liu Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, mcgrof@kernel.org, rostedt@goodmis.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, mhiramat@kernel.org, naveen.n.rao@linux.ibm.com, davem@davemloft.net, anil.s.keshavamurthy@intel.com, keescook@chromium.org, hch@infradead.org, dave@stgolabs.net, daniel@iogearbox.net, kernel-team@fb.com, x86@kernel.org, dave.hansen@linux.intel.com, rick.p.edgecombe@intel.com, akpm@linux-foundation.org Subject: Re: [PATCH bpf-next 1/3] mm/vmalloc: introduce vmalloc_exec which allocates RO+X memory Message-ID: References: <20220713071846.3286727-1-song@kernel.org> <20220713071846.3286727-2-song@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220713071846.3286727-2-song@kernel.org> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1657706037; a=rsa-sha256; cv=none; b=dATbhQxcfx5DXjbDA8dDP9/RmMwBOFYOPHZIAcokEMk8yhjlmIDCW6VcsAAMXxfcpkM5Gq T+R6TurneInFMrBjyxk2AT6j/suLMDmSNaKuiIzgf55jk9eM2AD0C+vDC1PYV9Ksc6bgHk SxODbeUryJn/Z0d1uMwF+JvNmtgoBoM= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=infradead.org header.s=desiato.20200630 header.b=YizJ1nYT; dmarc=none; spf=none (imf05.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.92.199) smtp.mailfrom=peterz@infradead.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1657706037; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=cRqnvJDsfN6fhCEHJ9PA7nMRlfBPVLCY2LI3JbYP3BI=; b=tUsUwbcJLbV9qJzPskHLbqGTneMc9m9kTIo5mRg5TJpy8UKNxqVSSmCDRYc3ngwVitlVdq fR/sX/WVb26blZCCYHmLwTtLzdYTRvyRx2SizoKzwHwe1AC6DdSOHi+HtH5ylIB90f5Wuc 5KpKlbFFo3eMYASiPEMfzY2JdjVv1aM= X-Stat-Signature: nwf85x4qe43ce6ba9pfhfzuahafkhnug X-Rspamd-Queue-Id: 8FE2D100048 Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=infradead.org header.s=desiato.20200630 header.b=YizJ1nYT; dmarc=none; spf=none (imf05.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.92.199) smtp.mailfrom=peterz@infradead.org X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1657706035-67036 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 Wed, Jul 13, 2022 at 12:18:44AM -0700, Song Liu wrote: > +/** > + * vmalloc_exec - allocate RO+X memory in kernel text space > + * @size: allocation size > + * > + * Allocate @size of RO+X memory in kernel text space. This memory can be > + * used to serve dynamic kernel text, such as BPF programs. > + * > + * The memory allocated is filled illegal instructions. > + * > + * Return: pointer to the allocated memory or %NULL on error > + */ > +void *vmalloc_exec(size_t size) > +{ > + return vmalloc_exec_pack_alloc(size); > +} > +EXPORT_SYMBOL_GPL(vmalloc_exec); NAK! modules do *NOT* get to allocate text.