From: Eugene Syromiatnikov <esyr@redhat.com>
To: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-api@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Andy Lutomirski <luto@amacapital.net>,
Balbir Singh <bsingharora@gmail.com>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Florian Weimer <fweimer@redhat.com>,
"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Kees Cook <keescook@chromium.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
Nadav Amit <nadav.amit@gmail.com>,
Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
Peter Zijlstra <peterz@infradead.org>,
Randy Dunlap <rdunlap@infradead.org>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>
Subject: Re: [RFC PATCH v4 26/27] x86/cet/shstk: Add arch_prctl functions for Shadow Stack
Date: Wed, 3 Oct 2018 19:57:25 +0200 [thread overview]
Message-ID: <20181003175725.GD32759@asgard.redhat.com> (raw)
Message-ID: <20181003175725.Jo5WBzGNwZVluOLehmlHm57Q_6OfQao34fytXorv02A@z> (raw)
In-Reply-To: <20180921150351.20898-27-yu-cheng.yu@intel.com>
On Fri, Sep 21, 2018 at 08:03:50AM -0700, Yu-cheng Yu wrote:
> arch_prctl(ARCH_CET_STATUS, unsigned long *addr)
> Return CET feature status.
>
> The parameter 'addr' is a pointer to a user buffer.
> On returning to the caller, the kernel fills the following
> information:
>
> *addr = SHSTK/IBT status
> *(addr + 1) = SHSTK base address
> *(addr + 2) = SHSTK size
The subtle detail here is that x32 binaries will get 64-bit value, which
is not entirely obvious. I think, it might be better to define
a structure type for it as a part of UAPI, for example:
struct user_cet_status {
__u32 struct_size;
__u32 features;
__kernel_ulong_t shstk_base;
__kernel_ulong_t shstk_size;
};
Adding "struct_size" field along with appropriate checks will also
allow for possible extensions, if they ever appear.
> arch_prctl(ARCH_CET_DISABLE, unsigned long features)
> Disable CET features specified in 'features'. Return
> -EPERM if CET is locked.
While x86_64 and x32 will have 64-bit space for feature bits, IA-32 will
have only 32 bits.
> arch_prctl(ARCH_CET_LOCK)
> Lock in CET feature.
>
> arch_prctl(ARCH_CET_ALLOC_SHSTK, unsigned long *addr)
> Allocate a new SHSTK.
>
> The parameter 'addr' is a pointer to a user buffer and indicates
> the desired SHSTK size to allocate. On returning to the caller
> the buffer contains the address of the new SHSTK.
Again, on x32 that will be a pointer to a 64-bit value, which is not
entirely obvious from this description.
It's not clear whether inability to enable some CET feature in runtime
is unavailable by design or by omission; same for setting (an allocated)
shadow stack as task's shadow stack.
>
> Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
> ---
> arch/x86/include/asm/cet.h | 5 ++
> arch/x86/include/uapi/asm/prctl.h | 5 ++
> arch/x86/kernel/Makefile | 2 +-
> arch/x86/kernel/cet.c | 27 +++++++++++
> arch/x86/kernel/cet_prctl.c | 79 +++++++++++++++++++++++++++++++
> arch/x86/kernel/process.c | 5 ++
> 6 files changed, 122 insertions(+), 1 deletion(-)
> create mode 100644 arch/x86/kernel/cet_prctl.c
>
> diff --git a/arch/x86/include/asm/cet.h b/arch/x86/include/asm/cet.h
> index b7b33e1026bb..212bd68e31d3 100644
> --- a/arch/x86/include/asm/cet.h
> +++ b/arch/x86/include/asm/cet.h
> @@ -12,19 +12,24 @@ struct task_struct;
> struct cet_status {
> unsigned long shstk_base;
> unsigned long shstk_size;
> + unsigned int locked:1;
> unsigned int shstk_enabled:1;
> };
>
> #ifdef CONFIG_X86_INTEL_CET
> +int prctl_cet(int option, unsigned long arg2);
> int cet_setup_shstk(void);
> int cet_setup_thread_shstk(struct task_struct *p);
> +int cet_alloc_shstk(unsigned long *arg);
> void cet_disable_shstk(void);
> void cet_disable_free_shstk(struct task_struct *p);
> int cet_restore_signal(unsigned long ssp);
> int cet_setup_signal(bool ia32, unsigned long rstor, unsigned long *new_ssp);
> #else
> +static inline int prctl_cet(int option, unsigned long arg2) { return 0; }
Why 0 and not -EINVAL?
> static inline int cet_setup_shstk(void) { return 0; }
0 here also looks strange.
> static inline int cet_setup_thread_shstk(struct task_struct *p) { return 0; }
And here.
> +static inline int cet_alloc_shstk(unsigned long *arg) { return -EINVAL; }
> static inline void cet_disable_shstk(void) {}
> static inline void cet_disable_free_shstk(struct task_struct *p) {}
> static inline int cet_restore_signal(unsigned long ssp) { return 0; }
> diff --git a/arch/x86/include/uapi/asm/prctl.h b/arch/x86/include/uapi/asm/prctl.h
> index 5a6aac9fa41f..3aec1088e01d 100644
> --- a/arch/x86/include/uapi/asm/prctl.h
> +++ b/arch/x86/include/uapi/asm/prctl.h
> @@ -14,4 +14,9 @@
> #define ARCH_MAP_VDSO_32 0x2002
> #define ARCH_MAP_VDSO_64 0x2003
>
> +#define ARCH_CET_STATUS 0x3001
> +#define ARCH_CET_DISABLE 0x3002
> +#define ARCH_CET_LOCK 0x3003
> +#define ARCH_CET_ALLOC_SHSTK 0x3004
> +
> #endif /* _ASM_X86_PRCTL_H */
> diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
> index 36b14ef410c8..b9e6cdc6b4f7 100644
> --- a/arch/x86/kernel/Makefile
> +++ b/arch/x86/kernel/Makefile
> @@ -139,7 +139,7 @@ obj-$(CONFIG_UNWINDER_ORC) += unwind_orc.o
> obj-$(CONFIG_UNWINDER_FRAME_POINTER) += unwind_frame.o
> obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o
>
> -obj-$(CONFIG_X86_INTEL_CET) += cet.o
> +obj-$(CONFIG_X86_INTEL_CET) += cet.o cet_prctl.o
>
> obj-$(CONFIG_ARCH_HAS_PROGRAM_PROPERTIES) += elf.o
>
> diff --git a/arch/x86/kernel/cet.c b/arch/x86/kernel/cet.c
> index ce0b3b7b1160..1c2689738604 100644
> --- a/arch/x86/kernel/cet.c
> +++ b/arch/x86/kernel/cet.c
> @@ -110,6 +110,33 @@ static int create_rstor_token(bool ia32, unsigned long ssp,
> return 0;
> }
>
> +int cet_alloc_shstk(unsigned long *arg)
> +{
> + unsigned long len = *arg;
> + unsigned long addr;
> + unsigned long token;
> + unsigned long ssp;
> +
> + addr = do_mmap_locked(0, len, PROT_READ,
> + MAP_ANONYMOUS | MAP_PRIVATE, VM_SHSTK);
> + if (addr >= TASK_SIZE_MAX)
> + return -ENOMEM;
> +
> + /* Restore token is 8 bytes and aligned to 8 bytes */
> + ssp = addr + len;
> + token = ssp;
> +
> + if (!in_ia32_syscall())
> + token |= 1;
This pair of check and bit or'ing definitely asks for a macro or a
wrapper function.
> + ssp -= 8;
> +
> + if (write_user_shstk_64(ssp, token))
> + return -EINVAL;
Shouldn't addr be unmapped on error?
> + *arg = addr;
> + return 0;
> +}
> +
> int cet_setup_shstk(void)
> {
> unsigned long addr, size;
> diff --git a/arch/x86/kernel/cet_prctl.c b/arch/x86/kernel/cet_prctl.c
> new file mode 100644
> index 000000000000..c4b7c19f5040
> --- /dev/null
> +++ b/arch/x86/kernel/cet_prctl.c
> @@ -0,0 +1,79 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#include <linux/errno.h>
> +#include <linux/uaccess.h>
> +#include <linux/prctl.h>
> +#include <linux/compat.h>
> +#include <asm/processor.h>
> +#include <asm/prctl.h>
> +#include <asm/elf.h>
> +#include <asm/elf_property.h>
> +#include <asm/cet.h>
> +
> +/* See Documentation/x86/intel_cet.txt. */
> +
> +static int handle_get_status(unsigned long arg2)
> +{
> + unsigned int features = 0;
> + unsigned long shstk_base, shstk_size;
> + unsigned long buf[3];
> +
> + if (current->thread.cet.shstk_enabled)
> + features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
> +
> + shstk_base = current->thread.cet.shstk_base;
> + shstk_size = current->thread.cet.shstk_size;
> +
> + buf[0] = (unsigned long)features;
> + buf[1] = shstk_base;
> + buf[2] = shstk_size;
> + return copy_to_user((unsigned long __user *)arg2, buf,
> + sizeof(buf));
> +}
> +
> +static int handle_alloc_shstk(unsigned long arg2)
> +{
> + int err = 0;
> + unsigned long shstk_size = 0;
> +
> + if (get_user(shstk_size, (unsigned long __user *)arg2))
> + return -EFAULT;
> +
> + err = cet_alloc_shstk(&shstk_size);
> + if (err)
> + return err;
> +
> + if (put_user(shstk_size, (unsigned long __user *)arg2))
Again, leaking allocated stack.
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> +int prctl_cet(int option, unsigned long arg2)
> +{
> + if (!cpu_feature_enabled(X86_FEATURE_SHSTK))
> + return -EINVAL;
> +
> + switch (option) {
> + case ARCH_CET_STATUS:
> + return handle_get_status(arg2);
> +
> + case ARCH_CET_DISABLE:
> + if (current->thread.cet.locked)
> + return -EPERM;
> + if (arg2 & GNU_PROPERTY_X86_FEATURE_1_SHSTK)
> + cet_disable_free_shstk(current);
The rest of bits in arg2 should be 0, otherwise this interface won't be
possible to extend.
> + return 0;
> +
> + case ARCH_CET_LOCK:
> + current->thread.cet.locked = 1;
> + return 0;
> +
> + case ARCH_CET_ALLOC_SHSTK:
> + return handle_alloc_shstk(arg2);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
> index 440f012ef925..251b8714f9a3 100644
> --- a/arch/x86/kernel/process.c
> +++ b/arch/x86/kernel/process.c
> @@ -792,6 +792,11 @@ long do_arch_prctl_common(struct task_struct *task, int option,
> return get_cpuid_mode();
> case ARCH_SET_CPUID:
> return set_cpuid_mode(task, cpuid_enabled);
> + case ARCH_CET_STATUS:
> + case ARCH_CET_DISABLE:
> + case ARCH_CET_LOCK:
> + case ARCH_CET_ALLOC_SHSTK:
> + return prctl_cet(option, cpuid_enabled);
It's probably a good opportunity to change the strange name for an argument
of a dispatch call.
next prev parent reply other threads:[~2018-10-04 0:46 UTC|newest]
Thread overview: 142+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 15:03 [RFC PATCH v4 00/27] Control Flow Enforcement: Shadow Stack Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 01/27] x86/cpufeatures: Add CPUIDs for Control-flow Enforcement Technology (CET) Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-25 16:27 ` Peter Zijlstra
2018-09-25 16:27 ` Peter Zijlstra
2018-09-25 16:29 ` Yu-cheng Yu
2018-09-25 16:29 ` Yu-cheng Yu
2018-09-28 16:51 ` Borislav Petkov
2018-09-28 16:51 ` Borislav Petkov
2018-09-28 16:56 ` Yu-cheng Yu
2018-09-28 16:56 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 02/27] x86/fpu/xstate: Change some names to separate XSAVES system and user states Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-25 16:37 ` Peter Zijlstra
2018-09-25 16:37 ` Peter Zijlstra
2018-10-02 15:29 ` Borislav Petkov
2018-10-02 15:29 ` Borislav Petkov
2018-10-02 16:21 ` Yu-cheng Yu
2018-10-02 16:21 ` Yu-cheng Yu
2018-10-02 16:30 ` Dave Hansen
2018-10-02 16:30 ` Dave Hansen
2018-10-02 16:37 ` Borislav Petkov
2018-10-02 16:37 ` Borislav Petkov
2018-10-02 16:39 ` Dave Hansen
2018-10-02 16:39 ` Dave Hansen
2018-10-02 16:43 ` Yu-cheng Yu
2018-10-02 16:43 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 03/27] x86/fpu/xstate: Enable XSAVES system states Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-25 17:03 ` Peter Zijlstra
2018-09-25 17:03 ` Peter Zijlstra
2018-09-25 17:23 ` Yu-cheng Yu
2018-09-25 17:23 ` Yu-cheng Yu
2018-10-02 17:15 ` Borislav Petkov
2018-10-02 17:15 ` Borislav Petkov
2018-10-04 15:47 ` Yu-cheng Yu
2018-10-04 15:47 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 04/27] x86/fpu/xstate: Add XSAVES system states for shadow stack Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 05/27] Documentation/x86: Add CET description Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 06/27] x86/cet: Control protection exception handler Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-10-03 10:39 ` Eugene Syromiatnikov
2018-10-03 10:39 ` Eugene Syromiatnikov
2018-10-03 16:11 ` Yu-cheng Yu
2018-10-03 16:11 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 07/27] x86/cet/shstk: Add Kconfig option for user-mode shadow stack Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 08/27] mm: Introduce VM_SHSTK for shadow stack memory Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 09/27] x86/mm: Change _PAGE_DIRTY to _PAGE_DIRTY_HW Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-10-03 13:38 ` Matthew Wilcox
2018-10-03 13:38 ` Matthew Wilcox
2018-10-03 14:05 ` Dave Hansen
2018-10-03 14:05 ` Dave Hansen
2018-10-03 16:07 ` Yu-cheng Yu
2018-10-03 16:07 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 10/27] drm/i915/gvt: Update _PAGE_DIRTY to _PAGE_DIRTY_BITS Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-10-03 13:19 ` Eugene Syromiatnikov
2018-10-03 13:19 ` Eugene Syromiatnikov
2018-09-21 15:03 ` [RFC PATCH v4 11/27] x86/mm: Introduce _PAGE_DIRTY_SW Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 12/27] x86/mm: Modify ptep_set_wrprotect and pmdp_set_wrprotect for _PAGE_DIRTY_SW Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 13/27] x86/mm: Shadow stack page fault error checking Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 14/27] mm: Handle shadow stack page fault Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 15/27] mm: Handle THP/HugeTLB " Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 16/27] mm: Update can_follow_write_pte/pmd for shadow stack Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 17/27] mm: Introduce do_mmap_locked() Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 18/27] x86/cet/shstk: User-mode shadow stack support Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-10-03 15:08 ` Eugene Syromiatnikov
2018-10-03 15:08 ` Eugene Syromiatnikov
2018-10-03 15:12 ` Yu-cheng Yu
2018-10-03 15:12 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 19/27] x86/cet/shstk: Introduce WRUSS instruction Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-10-03 4:15 ` Eugene Syromiatnikov
2018-10-03 4:15 ` Eugene Syromiatnikov
2018-09-21 15:03 ` [RFC PATCH v4 20/27] x86/cet/shstk: Signal handling for shadow stack Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-10-03 14:36 ` Eugene Syromiatnikov
2018-10-03 14:36 ` Eugene Syromiatnikov
2018-10-03 16:46 ` Jann Horn
2018-10-03 16:46 ` Jann Horn
2018-09-21 15:03 ` [RFC PATCH v4 21/27] x86/cet/shstk: ELF header parsing of Shadow Stack Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-10-03 23:27 ` Eugene Syromiatnikov
2018-10-03 23:27 ` Eugene Syromiatnikov
2018-10-09 21:15 ` Yu-cheng Yu
2018-10-09 21:15 ` Yu-cheng Yu
2018-10-15 23:40 ` Kees Cook
2018-10-15 23:40 ` Kees Cook
2018-10-16 17:23 ` Yu-cheng Yu
2018-10-16 17:23 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 22/27] x86/cet/shstk: Handle thread shadow stack Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 23/27] mm/map: Add Shadow stack pages to memory accounting Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 16:55 ` Randy Dunlap
2018-09-21 16:55 ` Randy Dunlap
2018-09-21 17:21 ` Yu-cheng Yu
2018-09-21 17:21 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 24/27] mm/mmap: Create a guard area between VMAs Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-10-03 4:56 ` Eugene Syromiatnikov
2018-10-03 4:56 ` Eugene Syromiatnikov
2018-10-03 5:36 ` Andy Lutomirski
2018-10-03 5:36 ` Andy Lutomirski
2018-10-03 16:00 ` Yu-cheng Yu
2018-10-03 16:00 ` Yu-cheng Yu
2018-10-03 16:18 ` Andy Lutomirski
2018-10-03 16:18 ` Andy Lutomirski
2018-10-03 16:32 ` Eugene Syromiatnikov
2018-10-03 16:32 ` Eugene Syromiatnikov
2018-10-03 16:40 ` Yu-cheng Yu
2018-10-03 16:40 ` Yu-cheng Yu
2018-10-03 16:52 ` Jann Horn
2018-10-03 16:52 ` Jann Horn
2018-10-03 21:21 ` Eugene Syromiatnikov
2018-10-03 21:21 ` Eugene Syromiatnikov
2018-09-21 15:03 ` [RFC PATCH v4 25/27] mm/mmap: Prevent Shadow Stack VMA merges Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 15:03 ` [RFC PATCH v4 26/27] x86/cet/shstk: Add arch_prctl functions for Shadow Stack Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-10-03 17:57 ` Eugene Syromiatnikov [this message]
2018-10-03 17:57 ` Eugene Syromiatnikov
2018-09-21 15:03 ` [RFC PATCH v4 27/27] x86/cet/shstk: Add Shadow Stack instructions to opcode map Yu-cheng Yu
2018-09-21 15:03 ` Yu-cheng Yu
2018-09-21 22:53 ` [RFC PATCH v4 00/27] Control Flow Enforcement: Shadow Stack Dave Hansen
2018-09-21 22:53 ` Dave Hansen
2018-09-24 15:25 ` Yu-cheng Yu
2018-09-24 15:25 ` Yu-cheng Yu
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