From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: [PATCH 2/3] xen/x86: Avoid undefined behaviour by shifting into a sign bit Date: Fri, 5 Aug 2016 14:50:12 +0100 Message-ID: <1470405013-18856-2-git-send-email-andrew.cooper3@citrix.com> References: <1470405013-18856-1-git-send-email-andrew.cooper3@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <1470405013-18856-1-git-send-email-andrew.cooper3@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Xen-devel Cc: Andrew Cooper , Jan Beulich List-Id: xen-devel@lists.xenproject.org U2lnbmVkLW9mZi1ieTogQW5kcmV3IENvb3BlciA8YW5kcmV3LmNvb3BlcjNAY2l0cml4LmNvbT4K LS0tCkNDOiBKYW4gQmV1bGljaCA8SkJldWxpY2hAc3VzZS5jb20+Ci0tLQogeGVuL2FyY2gveDg2 L2FwaWMuYyAgICAgICAgICAgfCAyICstCiB4ZW4vYXJjaC94ODYvY3B1L2NvbW1vbi5jICAgICB8 IDIgKy0KIHhlbi9hcmNoL3g4Ni94ODZfNjQvdHJhcHMuYyAgIHwgMiArLQogeGVuL2luY2x1ZGUv YXNtLXg4Ni9hcGljZGVmLmggfCAyICstCiA0IGZpbGVzIGNoYW5nZWQsIDQgaW5zZXJ0aW9ucygr KSwgNCBkZWxldGlvbnMoLSkKCmRpZmYgLS1naXQgYS94ZW4vYXJjaC94ODYvYXBpYy5jIGIveGVu L2FyY2gveDg2L2FwaWMuYwppbmRleCBmMzcyN2NkLi4zZmI5YTgyIDEwMDY0NAotLS0gYS94ZW4v YXJjaC94ODYvYXBpYy5jCisrKyBiL3hlbi9hcmNoL3g4Ni9hcGljLmMKQEAgLTU3MSw3ICs1NzEs NyBAQCB2b2lkIHNldHVwX2xvY2FsX0FQSUModm9pZCkKICAgICBmb3IgKGkgPSBBUElDX0lTUl9O UiAtIDE7IGkgPj0gMDsgaS0tKSB7CiAgICAgICAgIHZhbHVlID0gYXBpY19yZWFkKEFQSUNfSVNS ICsgaSoweDEwKTsKICAgICAgICAgZm9yIChqID0gMzE7IGogPj0gMDsgai0tKSB7Ci0gICAgICAg ICAgICBpZiAodmFsdWUgJiAoMTw8aikpCisgICAgICAgICAgICBpZiAodmFsdWUgJiAoMXUgPDwg aikpCiAgICAgICAgICAgICAgICAgYWNrX0FQSUNfaXJxKCk7CiAgICAgICAgIH0KICAgICB9CmRp ZmYgLS1naXQgYS94ZW4vYXJjaC94ODYvY3B1L2NvbW1vbi5jIGIveGVuL2FyY2gveDg2L2NwdS9j b21tb24uYwppbmRleCAyYzQ3NTg5Li4zMzM2OTA4IDEwMDY0NAotLS0gYS94ZW4vYXJjaC94ODYv Y3B1L2NvbW1vbi5jCisrKyBiL3hlbi9hcmNoL3g4Ni9jcHUvY29tbW9uLmMKQEAgLTQ3Niw3ICs0 NzYsNyBAQCB2b2lkIGRldGVjdF9leHRlbmRlZF90b3BvbG9neShzdHJ1Y3QgY3B1aW5mb194ODYg KmMpCiAJCXN1Yl9pbmRleCsrOwogCX0gd2hpbGUgKCBMRUFGQl9TVUJUWVBFKGVjeCkgIT0gSU5W QUxJRF9UWVBFICk7CiAKLQljb3JlX3NlbGVjdF9tYXNrID0gKH4oLTEgPDwgY29yZV9wbHVzX21h c2tfd2lkdGgpKSA+PiBodF9tYXNrX3dpZHRoOworCWNvcmVfc2VsZWN0X21hc2sgPSAofigtMXUg PDwgY29yZV9wbHVzX21hc2tfd2lkdGgpKSA+PiBodF9tYXNrX3dpZHRoOwogCiAJYy0+Y3B1X2Nv cmVfaWQgPSBwaHlzX3BrZ19pZChpbml0aWFsX2FwaWNpZCwgaHRfbWFza193aWR0aCkKIAkJJiBj b3JlX3NlbGVjdF9tYXNrOwpkaWZmIC0tZ2l0IGEveGVuL2FyY2gveDg2L3g4Nl82NC90cmFwcy5j IGIveGVuL2FyY2gveDg2L3g4Nl82NC90cmFwcy5jCmluZGV4IDE5ZjU4YTEuLjFiMWI2MWEgMTAw NjQ0Ci0tLSBhL3hlbi9hcmNoL3g4Ni94ODZfNjQvdHJhcHMuYworKysgYi94ZW4vYXJjaC94ODYv eDg2XzY0L3RyYXBzLmMKQEAgLTQxNCw3ICs0MTQsNyBAQCB2b2lkIHN1YmFyY2hfcGVyY3B1X3Ry YXBzX2luaXQodm9pZCkKICAgICB1bm1hcF9kb21haW5fcGFnZShzdHViX3BhZ2UpOwogCiAgICAg LyogQ29tbW9uIFNZU0NBTEwgcGFyYW1ldGVycy4gKi8KLSAgICB3cm1zcihNU1JfU1RBUiwgMCwg KEZMQVRfUklORzNfQ1MzMjw8MTYpIHwgX19IWVBFUlZJU09SX0NTKTsKKyAgICB3cm1zcihNU1Jf U1RBUiwgMCwgKCh1bnNpZ25lZClGTEFUX1JJTkczX0NTMzIgPDwgMTYpIHwgX19IWVBFUlZJU09S X0NTKTsKICAgICB3cm1zcihNU1JfU1lTQ0FMTF9NQVNLLCBYRU5fU1lTQ0FMTF9NQVNLLCAwVSk7 CiB9CiAKZGlmZiAtLWdpdCBhL3hlbi9pbmNsdWRlL2FzbS14ODYvYXBpY2RlZi5oIGIveGVuL2lu Y2x1ZGUvYXNtLXg4Ni9hcGljZGVmLmgKaW5kZXggODc1MjI4Ny4uZGE3ZjRkMyAxMDA2NDQKLS0t IGEveGVuL2luY2x1ZGUvYXNtLXg4Ni9hcGljZGVmLmgKKysrIGIveGVuL2luY2x1ZGUvYXNtLXg4 Ni9hcGljZGVmLmgKQEAgLTMwLDcgKzMwLDcgQEAKICNkZWZpbmUJCQlBUElDX0VJT19BQ0sJCTB4 MAkJLyogV3JpdGUgdGhpcyB0byB0aGUgRU9JIHJlZ2lzdGVyICovCiAjZGVmaW5lCQlBUElDX1JS UgkweEMwCiAjZGVmaW5lCQlBUElDX0xEUgkweEQwCi0jZGVmaW5lCQkJQVBJQ19MRFJfTUFTSwkJ KDB4RkY8PDI0KQorI2RlZmluZQkJCUFQSUNfTERSX01BU0sJCSgweEZGdTw8MjQpCiAjZGVmaW5l CQkJR0VUX3hBUElDX0xPR0lDQUxfSUQoeCkJKCgoeCk+PjI0KSYweEZGKQogI2RlZmluZQkJCVNF VF94QVBJQ19MT0dJQ0FMX0lEKHgpCSgoKHgpPDwyNCkpCiAjZGVmaW5lCQkJQVBJQ19BTExfQ1BV UwkJMHhGRgotLSAKMi4xLjQKCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW4ub3Jn Cmh0dHBzOi8vbGlzdHMueGVuLm9yZy94ZW4tZGV2ZWwK