From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4/5Ev0NLa1OGsEknldQooiT95DkeSqo6R+HYLoCPg+6lLtnC9yshsesV/r76ACoQNJtrKNu ARC-Seal: i=1; a=rsa-sha256; t=1524406727; cv=none; d=google.com; s=arc-20160816; b=F2bfKXE17wxI4H8ngS4XjkEQbOAASf4MLDvTpm58OhMlj3Q4u3dFqbEZr/jJQyP01A B/VYBCAJIT1lYO3/tcxNqQA6Pb1f1iC/nIXYre2/vKgMyZ1CcnLNHzslHKuNZw+9/Gaf PzVsTlnyDOnNEM+BZ0Lj4TKsiW6VBw7LI2Vj3djURsxCyNpp6hS7xMWAKOOqV1fwvNQx mBlLLGUJL9ZD0nV4tXPbOItdg6ZJK96Y0XUBVdIHwg528vBj8yDxNtdnad4avBVbAUUs i21Mu+qq61su8KKK+IZxNDDTCBf7vLXCuWFzg/c2dmMP1Cx5Fgq+DgNcZeOA868It9jC iTeg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=MHm1/xchah81mEFay9oWCNm30KXyi7SAzdU0xTZCI9k=; b=QR0/zuxBN+gvQDtas+YAkYhzA7xWY9J5PzHfQ7KKboxz1Dx+WUtYnnmWHAhIdRSJ8p u+9vg3nFDnkpNVNn8jwsrWpIosMnDiOd//VRux/1zm6Dd8TviOumzeldaud0fhcRZ5v+ RMf4N0evIj1jV8nMNttk5+e7tmWziu/v1Lln9VuC5PVtK6HnYlz2+7AXGTWQbepvBuYc 6F0xO1Q/qeDwvE9agfPS6dXkaV/PcrLkOV6pNxxJC/NnhgYEwLDSgh2IkKeHxDKpv92t zWappV9reP44cRNwTgpbeqbTRsXdHNH2BNmRZA2qCM6YGVRGniMfRIZVUSc1FK6HyNe8 RNsw== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, James Hogan , Matt Redfearn , Ralf Baechle , linux-mips@linux-mips.org Subject: [PATCH 4.4 82/97] MIPS: uaccess: Add micromips clobbers to bzero invocation Date: Sun, 22 Apr 2018 15:54:00 +0200 Message-Id: <20180422135309.683857392@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180422135304.577223025@linuxfoundation.org> References: <20180422135304.577223025@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1598455259602480989?= X-GMAIL-MSGID: =?utf-8?q?1598456307847051244?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Matt Redfearn commit b3d7e55c3f886493235bfee08e1e5a4a27cbcce8 upstream. The micromips implementation of bzero additionally clobbers registers t7 & t8. Specify this in the clobbers list when invoking bzero. Fixes: 26c5e07d1478 ("MIPS: microMIPS: Optimise 'memset' core library function.") Reported-by: James Hogan Signed-off-by: Matt Redfearn Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: # 3.10+ Patchwork: https://patchwork.linux-mips.org/patch/19110/ Signed-off-by: James Hogan Signed-off-by: Greg Kroah-Hartman --- arch/mips/include/asm/uaccess.h | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) --- a/arch/mips/include/asm/uaccess.h +++ b/arch/mips/include/asm/uaccess.h @@ -1238,6 +1238,13 @@ __clear_user(void __user *addr, __kernel { __kernel_size_t res; +#ifdef CONFIG_CPU_MICROMIPS +/* micromips memset / bzero also clobbers t7 & t8 */ +#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$15", "$24", "$31" +#else +#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$31" +#endif /* CONFIG_CPU_MICROMIPS */ + if (eva_kernel_access()) { __asm__ __volatile__( "move\t$4, %1\n\t" @@ -1247,7 +1254,7 @@ __clear_user(void __user *addr, __kernel "move\t%0, $6" : "=r" (res) : "r" (addr), "r" (size) - : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"); + : bzero_clobbers); } else { might_fault(); __asm__ __volatile__( @@ -1258,7 +1265,7 @@ __clear_user(void __user *addr, __kernel "move\t%0, $6" : "=r" (res) : "r" (addr), "r" (size) - : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"); + : bzero_clobbers); } return res;