From patchwork Mon Nov 20 23:54:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 745918 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1B9A13B2B7; Mon, 20 Nov 2023 23:55:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WV41QAv1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3F53DC433C7; Mon, 20 Nov 2023 23:55:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700524531; bh=FEKtInmB6mFDaJj7WRZ2UJIP9/hPzlhQkMpJUP8BQq8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=WV41QAv1rJxcj+vxnp7S0mCF1VeOKiaAkuL4CwSZ6/Jeks1hLwuKK9WMXrg9P0gd1 X3qZWI8NRU/tKrfslrA+LaaeugWU79B1mu7XTuYGFZk5bsbtqgQM/0bXJcBahZwpvE jXUUSP0ha5tVnF3yjM2iPpZiU5ACkYrzE0iNw6sD4/7g0wtTq0YDNx6pGtzmwbM8iC 4vcFDLPjdmR7wDMVw7PM9zhH5taYkZLzn8kyHG8RfuJoNbEGbirETrJCW8uLokNkG7 Y+XB8yIlaco10Anz0mUFJR443r/paPgMNsRVBJ62m+Q1kbY0AFN2MG7rekzOV0mDnN jG6Ws5gd2hYaw== From: Mark Brown Date: Mon, 20 Nov 2023 23:54:29 +0000 Subject: [PATCH RFT v3 1/5] mm: Introduce ARCH_HAS_USER_SHADOW_STACK Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231120-clone3-shadow-stack-v3-1-a7b8ed3e2acc@kernel.org> References: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> In-Reply-To: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> To: "Rick P. Edgecombe" , Deepak Gupta , Szabolcs Nagy , "H.J. Lu" , Florian Weimer , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Christian Brauner , Shuah Khan Cc: linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Kees Cook , jannh@google.com, bsegall@google.com, linux-kselftest@vger.kernel.org, linux-api@vger.kernel.org, Mark Brown , David Hildenbrand X-Mailer: b4 0.13-dev-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=2350; i=broonie@kernel.org; h=from:subject:message-id; bh=FEKtInmB6mFDaJj7WRZ2UJIP9/hPzlhQkMpJUP8BQq8=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlW/HeNGumee5BBgwYzS/jfuVxfmeNbdDo3h499Lve AEC5g2GJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZVvx3gAKCRAk1otyXVSH0MH8B/ 49OKKVqeGmJqH5SHRyriH7oXHLzEzq1hobb2QMbBMeWL3VRKyHvLSTHT7IONQZP9FOOs45Dl+Jbspj tkMdlvyxD8ciXP9uA1FlLLCsTh/Nl6K3upIWBVPL6QGN14wVx0XUfQe9saZn1BCkx48IfsFtoMY3lE VggZmBbeEUAkFRuD1Cwq655/PHcXYF7mZx10TVcyISzeZg+Xx/QbVUm9rflE/4Il3EV3+9NqKnT0oF cVRbKrLqJUp7D9F1mOQQUkkR6ppUCctRNdNpbT+m+JFgqgKenpvg4ru1ckIGBRIlr9gB9Mv3DvWfPu xydhRD0JNsM+AgQGPUlS0kJ4/f709v X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Since multiple architectures have support for shadow stacks and we need to select support for this feature in several places in the generic code provide a generic config option that the architectures can select. Suggested-by: David Hildenbrand Acked-by: David Hildenbrand Signed-off-by: Mark Brown Reviewed-by: Mike Rapoport (IBM) --- arch/x86/Kconfig | 1 + fs/proc/task_mmu.c | 2 +- include/linux/mm.h | 2 +- mm/Kconfig | 6 ++++++ 4 files changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 3762f41bb092..14b7703a9a2b 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1952,6 +1952,7 @@ config X86_USER_SHADOW_STACK depends on AS_WRUSS depends on X86_64 select ARCH_USES_HIGH_VMA_FLAGS + select ARCH_HAS_USER_SHADOW_STACK select X86_CET help Shadow stack protection is a hardware feature that detects function diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index ef2eb12906da..f0a904aeee8e 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -699,7 +699,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR [ilog2(VM_UFFD_MINOR)] = "ui", #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ -#ifdef CONFIG_X86_USER_SHADOW_STACK +#ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK [ilog2(VM_SHADOW_STACK)] = "ss", #endif }; diff --git a/include/linux/mm.h b/include/linux/mm.h index 418d26608ece..10462f354614 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -341,7 +341,7 @@ extern unsigned int kobjsize(const void *objp); #endif #endif /* CONFIG_ARCH_HAS_PKEYS */ -#ifdef CONFIG_X86_USER_SHADOW_STACK +#ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK /* * VM_SHADOW_STACK should not be set with VM_SHARED because of lack of * support core mm. diff --git a/mm/Kconfig b/mm/Kconfig index 89971a894b60..6713bb3b0b48 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1270,6 +1270,12 @@ config LOCK_MM_AND_FIND_VMA bool depends on !STACK_GROWSUP +config ARCH_HAS_USER_SHADOW_STACK + bool + help + The architecture has hardware support for userspace shadow call + stacks (eg, x86 CET, arm64 GCS or RISC-V Zicfiss). + source "mm/damon/Kconfig" endmenu From patchwork Mon Nov 20 23:54:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 745540 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B486A3B78E; Mon, 20 Nov 2023 23:55:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="uKBfjx9T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4225AC433C9; Mon, 20 Nov 2023 23:55:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700524539; bh=mqGigoaaiMhmd6ovFdfKwg/vE9ueH4EBzzSbnFxMDNg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=uKBfjx9TnCz7n+AoLmgoZbNEXSlYCNqoboOdH3GV/OBB4FZiVqBpTyCYRtlReKJD3 x2Pu7Bl+9iF9hi3UCHhchS1sPCkHObVnbH/qHyxhsLFcMpoHWZ7P6JAVPm761mcWDl xZf5dLe0JOZ0xBWf9Co2HpvLa65o+DyrpHOxZ6d7x8LVmGy8xtwxA23b0qF8Z14t65 PRFN1F3IjYaGuxsuPBPwdhyLb4juMeZMPjnv0PRmLZhnHUBFhYDwdY6n1MHSgI9I07 RRVjLt/MFbpB3YVJfGW7mz0OnEwGiETcI/X9R25ERqCCIoMrF93vSn88lcJUKVyjdF wIaxhKDMsyZCA== From: Mark Brown Date: Mon, 20 Nov 2023 23:54:30 +0000 Subject: [PATCH RFT v3 2/5] fork: Add shadow stack support to clone3() Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231120-clone3-shadow-stack-v3-2-a7b8ed3e2acc@kernel.org> References: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> In-Reply-To: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> To: "Rick P. Edgecombe" , Deepak Gupta , Szabolcs Nagy , "H.J. Lu" , Florian Weimer , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Christian Brauner , Shuah Khan Cc: linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Kees Cook , jannh@google.com, bsegall@google.com, linux-kselftest@vger.kernel.org, linux-api@vger.kernel.org, Mark Brown X-Mailer: b4 0.13-dev-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=9687; i=broonie@kernel.org; h=from:subject:message-id; bh=mqGigoaaiMhmd6ovFdfKwg/vE9ueH4EBzzSbnFxMDNg=; b=owGbwMvMwMWocq27KDak/QLjabUkhtToj/eT/77iuVcQXaYldX6xe6a+3rll0/nCDbf3B4n+Op1y 42ZtJ6MxCwMjF4OsmCLL2mcZq9LDJbbOfzT/FcwgViaQKQxcnAJwES72v3ItT/T/Ou77oxkSOu1Y3U p7z2MOkyddyWfuPVE3j3dxq/bc1F59pvzM3oUv3moW3Pwq5VBuN3mLf0CucNGLCRXdlxZXnnxa4Hzh sJqRzPQ3d3z+re6eM3/y44C7Wiy/HmzrYlKvnOgdelk7+7bOLEVNla4PD23Df55v28yWd1LxW/eN6g 9Hmr2u7NUOubx9f1eov4dtRbdW+0sxEV5xxZd6U5+9j2CLdPLw4JfM4+fYO3nNh3b5RvvYw90CZdYC 9YUCsSdjNhz9dH+Pvo9Toab58pd9jFyf2S0+P5Zz7/QoeFHZvEybXUXdqSh0//vFRZsu96xsNM01PR y8Pt7o/4XHJ1YJzTfIuev6sX0pAA== X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Unlike with the normal stack there is no API for configuring the the shadow stack for a new thread, instead the kernel will dynamically allocate a new shadow stack with the same size as the normal stack. This appears to be due to the shadow stack series having been in development since before the more extensible clone3() was added rather than anything more deliberate. Add a parameter to clone3() specifying the size of a shadow stack for the newly created process. If no shadow stack is specified then the existing implicit allocation behaviour is maintained. If the architecture does not support shadow stacks the shadow stack size parameter must be zero, architectures that do support the feature are expected to enforce the same requirement on individual systems that lack shadow stack support. Update the existing x86 implementation to pay attention to the newly added arguments, in order to maintain compatibility we use the existing behaviour if no shadow stack is specified. Minimal validation is done of the supplied parameters, detailed enforcement is left to when the thread is executed. Since we are now using more fields from the kernel_clone_args we pass that into the shadow stack code rather than individual fields. Signed-off-by: Mark Brown --- arch/x86/include/asm/shstk.h | 11 ++++++--- arch/x86/kernel/process.c | 2 +- arch/x86/kernel/shstk.c | 59 ++++++++++++++++++++++++++++++-------------- include/linux/sched/task.h | 1 + include/uapi/linux/sched.h | 4 +++ kernel/fork.c | 22 +++++++++++++++-- 6 files changed, 74 insertions(+), 25 deletions(-) diff --git a/arch/x86/include/asm/shstk.h b/arch/x86/include/asm/shstk.h index 42fee8959df7..8be7b0a909c3 100644 --- a/arch/x86/include/asm/shstk.h +++ b/arch/x86/include/asm/shstk.h @@ -6,6 +6,7 @@ #include struct task_struct; +struct kernel_clone_args; struct ksignal; #ifdef CONFIG_X86_USER_SHADOW_STACK @@ -16,8 +17,8 @@ struct thread_shstk { long shstk_prctl(struct task_struct *task, int option, unsigned long arg2); void reset_thread_features(void); -unsigned long shstk_alloc_thread_stack(struct task_struct *p, unsigned long clone_flags, - unsigned long stack_size); +unsigned long shstk_alloc_thread_stack(struct task_struct *p, + const struct kernel_clone_args *args); void shstk_free(struct task_struct *p); int setup_signal_shadow_stack(struct ksignal *ksig); int restore_signal_shadow_stack(void); @@ -26,8 +27,10 @@ static inline long shstk_prctl(struct task_struct *task, int option, unsigned long arg2) { return -EINVAL; } static inline void reset_thread_features(void) {} static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p, - unsigned long clone_flags, - unsigned long stack_size) { return 0; } + const struct kernel_clone_args *args) +{ + return 0; +} static inline void shstk_free(struct task_struct *p) {} static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; } static inline int restore_signal_shadow_stack(void) { return 0; } diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index b6f4e8399fca..a9ca80ea5056 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -207,7 +207,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) * is disabled, new_ssp will remain 0, and fpu_clone() will know not to * update it. */ - new_ssp = shstk_alloc_thread_stack(p, clone_flags, args->stack_size); + new_ssp = shstk_alloc_thread_stack(p, args); if (IS_ERR_VALUE(new_ssp)) return PTR_ERR((void *)new_ssp); diff --git a/arch/x86/kernel/shstk.c b/arch/x86/kernel/shstk.c index 59e15dd8d0f8..a14f47d70dfb 100644 --- a/arch/x86/kernel/shstk.c +++ b/arch/x86/kernel/shstk.c @@ -191,38 +191,61 @@ void reset_thread_features(void) current->thread.features_locked = 0; } -unsigned long shstk_alloc_thread_stack(struct task_struct *tsk, unsigned long clone_flags, - unsigned long stack_size) +unsigned long shstk_alloc_thread_stack(struct task_struct *tsk, + const struct kernel_clone_args *args) { struct thread_shstk *shstk = &tsk->thread.shstk; + unsigned long clone_flags = args->flags; unsigned long addr, size; /* * If shadow stack is not enabled on the new thread, skip any - * switch to a new shadow stack. + * implicit switch to a new shadow stack and reject attempts to + * explciitly specify one. */ - if (!features_enabled(ARCH_SHSTK_SHSTK)) - return 0; + if (!features_enabled(ARCH_SHSTK_SHSTK)) { + if (args->shadow_stack_size) + return (unsigned long)ERR_PTR(-EINVAL); - /* - * For CLONE_VFORK the child will share the parents shadow stack. - * Make sure to clear the internal tracking of the thread shadow - * stack so the freeing logic run for child knows to leave it alone. - */ - if (clone_flags & CLONE_VFORK) { - shstk->base = 0; - shstk->size = 0; return 0; } /* - * For !CLONE_VM the child will use a copy of the parents shadow - * stack. + * If the user specified a shadow stack then do some basic + * validation and use it, otherwise fall back to a default + * shadow stack size if the clone_flags don't indicate an + * allocation is unneeded. */ - if (!(clone_flags & CLONE_VM)) - return 0; + if (args->shadow_stack_size) { + size = args->shadow_stack_size; + + if (size < 8) + return (unsigned long)ERR_PTR(-EINVAL); + } else { + /* + * For CLONE_VFORK the child will share the parents + * shadow stack. Make sure to clear the internal + * tracking of the thread shadow stack so the freeing + * logic run for child knows to leave it alone. + */ + if (clone_flags & CLONE_VFORK) { + shstk->base = 0; + shstk->size = 0; + return 0; + } + + /* + * For !CLONE_VM the child will use a copy of the + * parents shadow stack. + */ + if (!(clone_flags & CLONE_VM)) + return 0; + + size = args->stack_size; + + } - size = adjust_shstk_size(stack_size); + size = adjust_shstk_size(size); addr = alloc_shstk(0, size, 0, false); if (IS_ERR_VALUE(addr)) return addr; diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h index a23af225c898..e86a09cfccd8 100644 --- a/include/linux/sched/task.h +++ b/include/linux/sched/task.h @@ -41,6 +41,7 @@ struct kernel_clone_args { void *fn_arg; struct cgroup *cgrp; struct css_set *cset; + unsigned long shadow_stack_size; }; /* diff --git a/include/uapi/linux/sched.h b/include/uapi/linux/sched.h index 3bac0a8ceab2..a998b6d0c897 100644 --- a/include/uapi/linux/sched.h +++ b/include/uapi/linux/sched.h @@ -84,6 +84,8 @@ * kernel's limit of nested PID namespaces. * @cgroup: If CLONE_INTO_CGROUP is specified set this to * a file descriptor for the cgroup. + * @shadow_stack_size: Specify the size of the shadow stack to allocate + * for the child process. * * The structure is versioned by size and thus extensible. * New struct members must go at the end of the struct and @@ -101,12 +103,14 @@ struct clone_args { __aligned_u64 set_tid; __aligned_u64 set_tid_size; __aligned_u64 cgroup; + __aligned_u64 shadow_stack_size; }; #endif #define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */ #define CLONE_ARGS_SIZE_VER1 80 /* sizeof second published struct */ #define CLONE_ARGS_SIZE_VER2 88 /* sizeof third published struct */ +#define CLONE_ARGS_SIZE_VER3 96 /* sizeof fourth published struct */ /* * Scheduling policies diff --git a/kernel/fork.c b/kernel/fork.c index 10917c3e1f03..b8ca8194bca5 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -3067,7 +3067,9 @@ noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs, CLONE_ARGS_SIZE_VER1); BUILD_BUG_ON(offsetofend(struct clone_args, cgroup) != CLONE_ARGS_SIZE_VER2); - BUILD_BUG_ON(sizeof(struct clone_args) != CLONE_ARGS_SIZE_VER2); + BUILD_BUG_ON(offsetofend(struct clone_args, shadow_stack_size) != + CLONE_ARGS_SIZE_VER3); + BUILD_BUG_ON(sizeof(struct clone_args) != CLONE_ARGS_SIZE_VER3); if (unlikely(usize > PAGE_SIZE)) return -E2BIG; @@ -3110,6 +3112,7 @@ noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs, .tls = args.tls, .set_tid_size = args.set_tid_size, .cgroup = args.cgroup, + .shadow_stack_size = args.shadow_stack_size, }; if (args.set_tid && @@ -3150,6 +3153,21 @@ static inline bool clone3_stack_valid(struct kernel_clone_args *kargs) return true; } +/** + * clone3_shadow_stack_valid - check and prepare shadow stack + * @kargs: kernel clone args + * + * Verify that shadow stacks are only enabled if supported. + */ +static inline bool clone3_shadow_stack_valid(struct kernel_clone_args *kargs) +{ + if (!kargs->shadow_stack_size) + return true; + + /* The architecture must check support on the specific machine */ + return IS_ENABLED(CONFIG_ARCH_HAS_USER_SHADOW_STACK); +} + static bool clone3_args_valid(struct kernel_clone_args *kargs) { /* Verify that no unknown flags are passed along. */ @@ -3172,7 +3190,7 @@ static bool clone3_args_valid(struct kernel_clone_args *kargs) kargs->exit_signal) return false; - if (!clone3_stack_valid(kargs)) + if (!clone3_stack_valid(kargs) || !clone3_shadow_stack_valid(kargs)) return false; return true; From patchwork Mon Nov 20 23:54:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 745917 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1926D3B78E; Mon, 20 Nov 2023 23:55:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="sbNb1lAP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F18A9C43395; Mon, 20 Nov 2023 23:55:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700524545; bh=bhar0tJdOqw54YK6iRyaAGbYhafIqhucm+rmgUHLm6s=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=sbNb1lAPsl6sDP/tWTQu1Rz0P0N22caWVrWtkm3Aupuki5R4MDTEbkjYRahtzKnOp TS49D15rjqBO0dPJbSNGnGxF5WjrIm1DaF5b3wz0fjJzxf4EGe2kvzjAnxutMwAQre qMpXITiZa0Ph1fxYBdtmvH5ZC0BAn5zjNqzFHDpJKryoPazMVvrGBpFG385YEStdGm 3NuQQFBvOAoKPmuWRe1zOB7/vOjL92hbyR3zYD73bZcnnOjR6TTe+j0hCCzNFZzhD9 G+2y/dBRXHDY27ZToDMrBXHB3Y46mDlUNgekAxTuQReGSZMnHo2OiCi5/0p2G3QPM8 Gxa/esUVawgAQ== From: Mark Brown Date: Mon, 20 Nov 2023 23:54:31 +0000 Subject: [PATCH RFT v3 3/5] selftests/clone3: Factor more of main loop into test_clone3() Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231120-clone3-shadow-stack-v3-3-a7b8ed3e2acc@kernel.org> References: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> In-Reply-To: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> To: "Rick P. Edgecombe" , Deepak Gupta , Szabolcs Nagy , "H.J. Lu" , Florian Weimer , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Christian Brauner , Shuah Khan Cc: linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Kees Cook , jannh@google.com, bsegall@google.com, linux-kselftest@vger.kernel.org, linux-api@vger.kernel.org, Mark Brown X-Mailer: b4 0.13-dev-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=3743; i=broonie@kernel.org; h=from:subject:message-id; bh=bhar0tJdOqw54YK6iRyaAGbYhafIqhucm+rmgUHLm6s=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlW/HgP5b6BhRuIr5G+HNtIoh396YxC2fEVDwlQCIA cfRuecyJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZVvx4AAKCRAk1otyXVSH0PX3CA CCEnfkUPFFpPUROq1L+Sp+FJRBtKQh0aJtXZwE3SQa+n2gOmuE3MpcL3rJcHB235Z0jZslOsN9gJyx OJVFm3V3YY+HKUAXtH8DnZrmDui9hTfX3WgmIyBvSvq0Ygg08gWSb8SghG5HJjzGaejdY6DpUwcrnC sIuxAZqX4FDzlS4VOM8ngVUsFhetDIsLIYTRYjW2fc4MCMwhmzyyRg251AaNOfiyCC/JQ3tpzc3uym jo+P8kQHpoNzsBPMgyNIJX+EO/xQjz5+caORTxjYNSJin+eQZzAV6ByNPtgdNxV+LdB3vpOCSzJ++Z rKJV3rfuFANlis6xKG1tYF5s/ZI5NN X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB In order to make it easier to add more configuration for the tests and more support for runtime detection of when tests can be run pass the structure describing the tests into test_clone3() rather than picking the arguments out of it and have that function do all the per-test work. No functional change. Signed-off-by: Mark Brown --- tools/testing/selftests/clone3/clone3.c | 77 ++++++++++++++++----------------- 1 file changed, 37 insertions(+), 40 deletions(-) diff --git a/tools/testing/selftests/clone3/clone3.c b/tools/testing/selftests/clone3/clone3.c index 3c9bf0cd82a8..1108bd8e36d6 100644 --- a/tools/testing/selftests/clone3/clone3.c +++ b/tools/testing/selftests/clone3/clone3.c @@ -30,6 +30,19 @@ enum test_mode { CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG, }; +typedef bool (*filter_function)(void); +typedef size_t (*size_function)(void); + +struct test { + const char *name; + uint64_t flags; + size_t size; + size_function size_function; + int expected; + enum test_mode test_mode; + filter_function filter; +}; + static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode) { struct __clone_args args = { @@ -104,30 +117,40 @@ static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode) return 0; } -static bool test_clone3(uint64_t flags, size_t size, int expected, - enum test_mode test_mode) +static void test_clone3(const struct test *test) { + size_t size; int ret; + if (test->filter && test->filter()) { + ksft_test_result_skip("%s\n", test->name); + return; + } + + if (test->size_function) + size = test->size_function(); + else + size = test->size; + + ksft_print_msg("Running test '%s'\n", test->name); + ksft_print_msg( "[%d] Trying clone3() with flags %#" PRIx64 " (size %zu)\n", - getpid(), flags, size); - ret = call_clone3(flags, size, test_mode); + getpid(), test->flags, size); + ret = call_clone3(test->flags, size, test->test_mode); ksft_print_msg("[%d] clone3() with flags says: %d expected %d\n", - getpid(), ret, expected); - if (ret != expected) { + getpid(), ret, test->expected); + if (ret != test->expected) { ksft_print_msg( "[%d] Result (%d) is different than expected (%d)\n", - getpid(), ret, expected); - return false; + getpid(), ret, test->expected); + ksft_test_result_fail("%s\n", test->name); + return; } - return true; + ksft_test_result_pass("%s\n", test->name); } -typedef bool (*filter_function)(void); -typedef size_t (*size_function)(void); - static bool not_root(void) { if (getuid() != 0) { @@ -155,16 +178,6 @@ static size_t page_size_plus_8(void) return getpagesize() + 8; } -struct test { - const char *name; - uint64_t flags; - size_t size; - size_function size_function; - int expected; - enum test_mode test_mode; - filter_function filter; -}; - static const struct test tests[] = { { .name = "simple clone3()", @@ -314,24 +327,8 @@ int main(int argc, char *argv[]) ksft_set_plan(ARRAY_SIZE(tests)); test_clone3_supported(); - for (i = 0; i < ARRAY_SIZE(tests); i++) { - if (tests[i].filter && tests[i].filter()) { - ksft_test_result_skip("%s\n", tests[i].name); - continue; - } - - if (tests[i].size_function) - size = tests[i].size_function(); - else - size = tests[i].size; - - ksft_print_msg("Running test '%s'\n", tests[i].name); - - ksft_test_result(test_clone3(tests[i].flags, size, - tests[i].expected, - tests[i].test_mode), - "%s\n", tests[i].name); - } + for (i = 0; i < ARRAY_SIZE(tests); i++) + test_clone3(&tests[i]); ksft_finished(); } From patchwork Mon Nov 20 23:54:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 745539 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C72A53B2B7; Mon, 20 Nov 2023 23:55:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Pt33pMEF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 05943C433C7; Mon, 20 Nov 2023 23:55:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700524551; bh=ZmJrvmANp1kG9kAUuq4ZkamJ4qQyGfBTGbaFEhsSApg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Pt33pMEF/POpoykTVCH0esLyYbbCA2/MuiuNDDhdvAugx8KFmw1tKn0bSGo7z/oz+ uTpvArUvH/uYX6qe3ShTmgtb/T6RI1JePjh5tg6z8p4WQUWyFTWhQGtSjDAQi6USTW qKzFTWEAc1f0yTUnxW2TqUOqSj/TDffFDIrcVSJSKvu2b/rm32KMmTLetFUaxI2qal zzcfIzZ92zr1qyK6uxLuX4aO0Furel8hX3pF/t4W7FuxsrDGCs2C30kEhECaAG59Vm kYB+l7BGTqAm8k9FyACmKx1cePKJkZg6iGWC2yRou1kXBfFGtINk7Ro4mDGyALeYtE TEMF/bL6tIPNg== From: Mark Brown Date: Mon, 20 Nov 2023 23:54:32 +0000 Subject: [PATCH RFT v3 4/5] selftests/clone3: Allow tests to flag if -E2BIG is a valid error code Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231120-clone3-shadow-stack-v3-4-a7b8ed3e2acc@kernel.org> References: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> In-Reply-To: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> To: "Rick P. Edgecombe" , Deepak Gupta , Szabolcs Nagy , "H.J. Lu" , Florian Weimer , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Christian Brauner , Shuah Khan Cc: linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Kees Cook , jannh@google.com, bsegall@google.com, linux-kselftest@vger.kernel.org, linux-api@vger.kernel.org, Mark Brown X-Mailer: b4 0.13-dev-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=1887; i=broonie@kernel.org; h=from:subject:message-id; bh=ZmJrvmANp1kG9kAUuq4ZkamJ4qQyGfBTGbaFEhsSApg=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlW/Hhnma1u0qT3kkylcajBZLZYCk8NKYNAoP26I5f MjRNpjiJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZVvx4QAKCRAk1otyXVSH0GubB/ 930Z/P0fuK5MX34Cy4dkfAwusyWEBKeRlq5NwdEPpqMld6z0jmCDctq4ZM5xWaF1ZYbS+rLB1ZAuHU OWz4yL3h9ZysR3RtjxxJCdN+91hooUs0KMPMZjkwQ6b5Zlxd9VIP1oOqU1cyZCEEidqERh2jRelK+E bF31tT3a+VziuPw1P7FBseViqvx+pKNyUIkdof/DR2OnHkxe0578uGYGat1WoJnmImpaoO/qV7mJVy HcGbCOl/Djx4qpYi5WjVW0f6UgWHpRjRIqfxCLzpwG5+O7EMUGTWuh3ngitrCL7rb4jJnZ/QqDNu2I +xNCeJWCK33IoNahE8vywB6sFw8MZH X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB The clone_args structure is extensible, with the syscall passing in the length of the structure. Inside the kernel we use copy_struct_from_user() to read the struct but this has the unfortunate side effect of silently accepting some overrun in the structure size providing the extra data is all zeros. This means that we can't discover the clone3() features that the running kernel supports by simply probing with various struct sizes. We need to check this for the benefit of test systems which run newer kselftests on old kernels. Add a flag which can be set on a test to indicate that clone3() may return -E2BIG due to the use of newer struct versions. Currently no tests need this but it will become an issue for testing clone3() support for shadow stacks, the support for shadow stacks is already present on x86. Signed-off-by: Mark Brown --- tools/testing/selftests/clone3/clone3.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/clone3/clone3.c b/tools/testing/selftests/clone3/clone3.c index 1108bd8e36d6..6adbfd14c841 100644 --- a/tools/testing/selftests/clone3/clone3.c +++ b/tools/testing/selftests/clone3/clone3.c @@ -39,6 +39,7 @@ struct test { size_t size; size_function size_function; int expected; + bool e2big_valid; enum test_mode test_mode; filter_function filter; }; @@ -141,6 +142,11 @@ static void test_clone3(const struct test *test) ksft_print_msg("[%d] clone3() with flags says: %d expected %d\n", getpid(), ret, test->expected); if (ret != test->expected) { + if (test->e2big_valid && ret == -E2BIG) { + ksft_print_msg("Test reported -E2BIG\n"); + ksft_test_result_skip("%s\n", test->name); + return; + } ksft_print_msg( "[%d] Result (%d) is different than expected (%d)\n", getpid(), ret, test->expected); From patchwork Mon Nov 20 23:54:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 745916 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D47813B2B7; Mon, 20 Nov 2023 23:55:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kXPWNcG5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 117A9C433CD; Mon, 20 Nov 2023 23:55:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700524557; bh=owctnHEQpTZFQ/Gh7J9JCdoUfmKHACZs61x8UVn64fA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=kXPWNcG58IzRJcCMYKqGURnJUj6rneGHKU5SHp+Yf638TdXxD6qdEjDB7S6BCsaPN kw1grYPFTeK8O5cG4h2X1cqzvy7XNsobjqD1iKKOpu1y7GW7ir3IcILs1wvsxePXiX Om32bgn+r0Kc4xsb7B1qJWMcY1ZTdpkCqgZG6axe8UqYiPPUaoeS9aNspPLDfQYe7F 4i5WaIbb0Lb48acRfEomtvfTLDEae9OiDs96AATwQ4MzV7kPJ53TypjDlyYATRcP1F nhlKAg5hr5a2EkdbbJmjlz8SdWFaQ9QHXR6en4tnnzhDUYXYcnIjzDOwk8LfxvxLFB a0M4ISsRfNyLg== From: Mark Brown Date: Mon, 20 Nov 2023 23:54:33 +0000 Subject: [PATCH RFT v3 5/5] kselftest/clone3: Test shadow stack support Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231120-clone3-shadow-stack-v3-5-a7b8ed3e2acc@kernel.org> References: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> In-Reply-To: <20231120-clone3-shadow-stack-v3-0-a7b8ed3e2acc@kernel.org> To: "Rick P. Edgecombe" , Deepak Gupta , Szabolcs Nagy , "H.J. Lu" , Florian Weimer , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Christian Brauner , Shuah Khan Cc: linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , Kees Cook , jannh@google.com, bsegall@google.com, linux-kselftest@vger.kernel.org, linux-api@vger.kernel.org, Mark Brown X-Mailer: b4 0.13-dev-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=6256; i=broonie@kernel.org; h=from:subject:message-id; bh=owctnHEQpTZFQ/Gh7J9JCdoUfmKHACZs61x8UVn64fA=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlW/HiMlAIrIk0zoNZPXS7mjGALNqlLtxI2zW1lzFx 3jMYT1aJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZVvx4gAKCRAk1otyXVSH0ET0B/ 4nvEdmzpCcydJg0+47Rl9429nQXE80i9vOlZZ/9WqqOIYAlKpHeFSIOp/PZDC83mbAQAxnUgbUKz02 SCY9ehwt0jFjCW6KAfX3s5hXXl5tcbhUGCHr9lyXvKF4RC8gUhqsAn7Di0fIfaEyPir7UEEbwfAI9N KAD4OkZsq2rJBXu/VfcqDkUqE3NAI/WfYWh0ztHPuhz7F+6+z34EL5+xqEN+LBsYQMbB/5dVN/Icjx XRa8eunc+ibLyI5fUpjAe8aUnbiQwU+xUl/9w21ilfDLimj8hwbZSMx5zyvOvN2sl31yjPqo6wtKaB Qpc9fjLP8sGNv3P8Guq8Q/ZS7Ha8T6 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Add basic test coverage for specifying the shadow stack for a newly created thread via clone3(), including coverage of the newly extended argument structure. In order to facilitate testing on systems without userspace shadow stack support we manually enable shadow stacks on startup, this is architecture specific due to the use of an arch_prctl() on x86. Due to interactions with potential userspace locking of features we actually detect support for shadow stacks on the running system by attempting to allocate a shadow stack page during initialisation using map_shadow_stack(), warning if this succeeds when the enable failed. Signed-off-by: Mark Brown --- tools/testing/selftests/clone3/clone3.c | 117 ++++++++++++++++++++++ tools/testing/selftests/clone3/clone3_selftests.h | 7 ++ 2 files changed, 124 insertions(+) diff --git a/tools/testing/selftests/clone3/clone3.c b/tools/testing/selftests/clone3/clone3.c index 6adbfd14c841..0f9f99dc5aac 100644 --- a/tools/testing/selftests/clone3/clone3.c +++ b/tools/testing/selftests/clone3/clone3.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -21,6 +22,10 @@ #include "../kselftest.h" #include "clone3_selftests.h" +static bool shadow_stack_enabled; +static bool shadow_stack_supported; +static size_t max_supported_args_size; + enum test_mode { CLONE3_ARGS_NO_TEST, CLONE3_ARGS_ALL_0, @@ -28,6 +33,7 @@ enum test_mode { CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG, CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG, + CLONE3_ARGS_SHADOW_STACK, }; typedef bool (*filter_function)(void); @@ -44,6 +50,36 @@ struct test { filter_function filter; }; +#ifndef __NR_map_shadow_stack +#define __NR_map_shadow_stack 453 +#endif + +/* + * We check for shadow stack support by attempting to use + * map_shadow_stack() since features may have been locked by the + * dynamic linker resulting in spurious errors when we attempt to + * enable on startup. We warn if the enable failed. + */ +static void test_shadow_stack_supported(void) +{ + long shadow_stack; + + shadow_stack = syscall(__NR_map_shadow_stack, 0, getpagesize(), 0); + if (shadow_stack == -1) { + ksft_print_msg("map_shadow_stack() not supported\n"); + } else if ((void *)shadow_stack == MAP_FAILED) { + ksft_print_msg("Failed to map shadow stack\n"); + } else { + ksft_print_msg("Shadow stack supportd\n"); + shadow_stack_supported = true; + + if (!shadow_stack_enabled) + ksft_print_msg("Mapped but did not enable shadow stack\n"); + + munmap((void *)shadow_stack, getpagesize()); + } +} + static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode) { struct __clone_args args = { @@ -89,6 +125,9 @@ static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode) case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG: args.exit_signal = 0x00000000000000f0ULL; break; + case CLONE3_ARGS_SHADOW_STACK: + args.shadow_stack_size = getpagesize(); + break; } memcpy(&args_ext.args, &args, sizeof(struct __clone_args)); @@ -179,6 +218,26 @@ static bool no_timenamespace(void) return true; } +static bool have_shadow_stack(void) +{ + if (shadow_stack_supported) { + ksft_print_msg("Shadow stack supported\n"); + return true; + } + + return false; +} + +static bool no_shadow_stack(void) +{ + if (!shadow_stack_supported) { + ksft_print_msg("Shadow stack not supported\n"); + return true; + } + + return false; +} + static size_t page_size_plus_8(void) { return getpagesize() + 8; @@ -322,16 +381,74 @@ static const struct test tests[] = { .expected = -EINVAL, .test_mode = CLONE3_ARGS_NO_TEST, }, + { + .name = "Shadow stack on system with shadow stack", + .flags = CLONE_VM, + .size = 0, + .expected = 0, + .e2big_valid = true, + .test_mode = CLONE3_ARGS_SHADOW_STACK, + .filter = no_shadow_stack, + }, + { + .name = "Shadow stack on system without shadow stack", + .flags = CLONE_VM, + .size = 0, + .expected = -EINVAL, + .e2big_valid = true, + .test_mode = CLONE3_ARGS_SHADOW_STACK, + .filter = have_shadow_stack, + }, }; +#ifdef __x86_64__ +#define ARCH_SHSTK_ENABLE 0x5001 +#define ARCH_SHSTK_SHSTK (1ULL << 0) + +#define ARCH_PRCTL(arg1, arg2) \ +({ \ + long _ret; \ + register long _num asm("eax") = __NR_arch_prctl; \ + register long _arg1 asm("rdi") = (long)(arg1); \ + register long _arg2 asm("rsi") = (long)(arg2); \ + \ + asm volatile ( \ + "syscall\n" \ + : "=a"(_ret) \ + : "r"(_arg1), "r"(_arg2), \ + "0"(_num) \ + : "rcx", "r11", "memory", "cc" \ + ); \ + _ret; \ +}) + +#define ENABLED_SHADOW_STACK +static inline void enable_shadow_stack(void) +{ + int ret = ARCH_PRCTL(ARCH_SHSTK_ENABLE, ARCH_SHSTK_SHSTK); + if (ret == 0) + shadow_stack_enabled = true; +} + +#endif + +#ifndef ENABLE_SHADOW_STACK +static void enable_shadow_stack(void) +{ +} +#endif + int main(int argc, char *argv[]) { size_t size; int i; + enable_shadow_stack(); + ksft_print_header(); ksft_set_plan(ARRAY_SIZE(tests)); test_clone3_supported(); + test_shadow_stack_supported(); for (i = 0; i < ARRAY_SIZE(tests); i++) test_clone3(&tests[i]); diff --git a/tools/testing/selftests/clone3/clone3_selftests.h b/tools/testing/selftests/clone3/clone3_selftests.h index 3d2663fe50ba..2e06127091f5 100644 --- a/tools/testing/selftests/clone3/clone3_selftests.h +++ b/tools/testing/selftests/clone3/clone3_selftests.h @@ -31,6 +31,13 @@ struct __clone_args { __aligned_u64 set_tid; __aligned_u64 set_tid_size; __aligned_u64 cgroup; +#ifndef CLONE_ARGS_SIZE_VER2 +#define CLONE_ARGS_SIZE_VER2 88 /* sizeof third published struct */ +#endif + __aligned_u64 shadow_stack_size; +#ifndef CLONE_ARGS_SIZE_VER3 +#define CLONE_ARGS_SIZE_VER3 96 /* sizeof fourth published struct */ +#endif }; static pid_t sys_clone3(struct __clone_args *args, size_t size)