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Mon, 17 Feb 2025 00:59:40 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 7a742be0-ecca-11ef-9896-31a8f345e629 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=ZwX3Z60naN7VY41//xVYiVxuiwP37qtB8l151pKrgIC10V7nE9D+WdpBFdgVbJrBw6pyHxU2BZGzNQvoXmuBn6lOHPvBys9jph7tjGpf8t93kT05TDkbiqQQ7p1uHGYlCZ0QDruDYjGcpc1zAR9UtXodtMM5qmV4ngKSVweVcPyHI8gNL7zB9JfW6JciwTx6u/5PfRChFz8MsaIkxMvhyJC33kxW5yhHAbwX+HbnFmSMMFlVpDaIrkZN+A/HHRnEQHHl6p5GJ8QVxW2JjwMKkUPIX+00QLumWxeG+x8FhtRHr5rmcfvq9PdufrxsNVyRpR/2StURJWqPETf3bV5/hw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: epam.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: GV1PR03MB10456.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 81f22b56-f4ef-4bd7-b140-08dd4eee5bd3 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Feb 2025 00:59:40.6115 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b41b72d0-4e9f-4c26-8a69-f949f367c91d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: T1y/3haVsWR30WDMDx0It2bN16FbGy8cRWle7tFlCt8r8+vLNgmOfKf5t+c8p7jtUxVqXAToCOuyv+W8HmvYagxeWl7DeaMtsWO98ztpLz8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV1PR03MB10519 Hi Julien, Julien Grall writes: > Hi Volodymyr, > > On 13/02/2025 22:00, Volodymyr Babchuk wrote: >> diff --git a/xen/common/stack-protector.c b/xen/common/stack-protector.c >> new file mode 100644 >> index 0000000000..286753a1b1 >> --- /dev/null >> +++ b/xen/common/stack-protector.c >> @@ -0,0 +1,51 @@ >> +/* SPDX-License-Identifier: GPL-2.0-only */ >> +#include >> +#include >> +#include >> +#include >> + >> +/* >> + * Initial value is chosen by a fair dice roll. >> + * It will be updated during boot process. >> + */ >> +#if BITS_PER_LONG =3D=3D 32 >> +unsigned long __ro_after_init __stack_chk_guard =3D 0xdd2cc927UL; >> +#else >> +unsigned long __ro_after_init __stack_chk_guard =3D 0x2d853605a4d9a09cU= L; >> +#endif >> + >> +/* >> + * This function should be called from early asm or from a C function >> + * that escapes stack canary tracking (by calling >> + * reset_stack_and_jump() for example). >> + */ >> +void __init asmlinkage boot_stack_chk_guard_setup(void) > > I am probably missing something. But what prevent the compiler to > insert a stack guard when entering this function and checking on exit? > Wouldn't this fail because __stack_chk_guard would be different? Yes, you are right. I got carried away a bit this time. It is working right now only because GCC does not emit stack checking code in this particular function. With "-fstack-protector-all" it panics, as expected. > IOW, shouldn't this function be a static always inline like it used to be= ? Yes, I am going to make it inline in the next version. --=20 WBR, Volodymyr=