Message ID | b24adf53a968b50ba84630f86136ee1251e12a9d.1552929301.git.andreyknvl@google.com (mailing list archive) |
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State | New, archived |
Headers | show
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[209.85.220.73]) by mx.google.com with SMTPS id k33sor12611454qte.66.2019.03.18.10.18.23 for <linux-mm@kvack.org> (Google Transport Security); Mon, 18 Mar 2019 10:18:23 -0700 (PDT) Received-SPF: pass (google.com: domain of 33tkpxaokck0naqerlxaiytbbtyr.pbzyvahk-zzxinpx.bet@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) client-ip=209.85.220.73; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=n6mK8qGB; spf=pass (google.com: domain of 33tkpxaokck0naqerlxaiytbbtyr.pbzyvahk-zzxinpx.bet@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=33tKPXAoKCK0NaQeRlXaiYTbbTYR.PbZYVahk-ZZXiNPX.beT@flex--andreyknvl.bounces.google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=y0pmDLbK+7BSAh5x56WEIsXOyLAwrKLQOAsadcipF54=; b=n6mK8qGBi8yC21LmjABra3FF+XTvfgLYZr9bPF1sHZ9sen0usXtJo9r8UWpIWYoDEs YEss5ttEDAL6lIbgFyj4X628k4cUup4CCMJ0VLQ4ftrPTG+rRMptHjumdErdUDl9ISYY rB+TuyC09kttxpZuExC8/+TH8Y8tVKRukuxPYVczcjDCqo+QtLbM9TmxH0fH4rTQxur3 7pLUDwD0Z21jyoNe+FO+hi4d+W5N8IZjBamLALgbuY36eoX0Noj2JHkXsAIpP352R88b ntHc4rkT8wXoHbCbhE2dgY+nunbgZmc/Jf/sc4zQqGibHR6/JS9I5KqLldKTT6WFAxiu sHnA== X-Google-Smtp-Source: APXvYqycOMQXhB7LunCtJ2mSN8JG36V+ND4YFbv89PhbTN2edqY1ONzRmnxPOCaXOMvcqg83reHV4EVl11OVLG5G X-Received: by 2002:ac8:2e7a:: with SMTP id s55mr10982902qta.34.1552929502878; Mon, 18 Mar 2019 10:18:22 -0700 (PDT) Date: Mon, 18 Mar 2019 18:17:43 +0100 In-Reply-To: <cover.1552929301.git.andreyknvl@google.com> Message-Id: <b24adf53a968b50ba84630f86136ee1251e12a9d.1552929301.git.andreyknvl@google.com> Mime-Version: 1.0 References: <cover.1552929301.git.andreyknvl@google.com> X-Mailer: git-send-email 2.21.0.225.g810b269d1ac-goog Subject: [PATCH v12 11/13] uprobes, arm64: untag user pointers in find_active_uprobe From: Andrey Konovalov <andreyknvl@google.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Mark Rutland <mark.rutland@arm.com>, Robin Murphy <robin.murphy@arm.com>, Kees Cook <keescook@chromium.org>, Kate Stewart <kstewart@linuxfoundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@kernel.org>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Shuah Khan <shuah@kernel.org>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Eric Dumazet <edumazet@google.com>, "David S. Miller" <davem@davemloft.net>, Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>, Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Arnaldo Carvalho de Melo <acme@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Dmitry Vyukov <dvyukov@google.com>, Kostya Serebryany <kcc@google.com>, Evgeniy Stepanov <eugenis@google.com>, Lee Smith <Lee.Smith@arm.com>, Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>, Jacob Bramley <Jacob.Bramley@arm.com>, Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>, Chintan Pandya <cpandya@codeaurora.org>, Luc Van Oostenryck <luc.vanoostenryck@gmail.com>, Dave Martin <Dave.Martin@arm.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Szabolcs Nagy <Szabolcs.Nagy@arm.com>, Andrey Konovalov <andreyknvl@google.com> Content-Type: text/plain; charset="UTF-8" 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: <linux-mm.kvack.org> X-Virus-Scanned: ClamAV using ClamSMTP |
Series |
arm64: untag user pointers passed to the kernel
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diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index c5cde87329c7..d3a2716a813a 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1992,6 +1992,8 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp) struct uprobe *uprobe = NULL; struct vm_area_struct *vma; + bp_vaddr = untagged_addr(bp_vaddr); + down_read(&mm->mmap_sem); vma = find_vma(mm, bp_vaddr); if (vma && vma->vm_start <= bp_vaddr) {
This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. find_active_uprobe() uses provided user pointer (obtained via instruction_pointer(regs)) for vma lookups, which can only by done with untagged pointers. Untag the user pointer in this function. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- kernel/events/uprobes.c | 2 ++ 1 file changed, 2 insertions(+)