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Groups > linux.kernel > #1595581
| From | Thomas Garnier <thgarnie@google.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v1 2/4] x86/syscalls: Specific usage of verify_pre_usermode_state |
| Date | 2017-03-09 00:40 +0100 |
| Message-ID | <tiTlw-58c-9@gated-at.bofh.it> (permalink) |
| References | <tiRMK-3Y7-17@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Implement specific usage of verify_pre_usermode_state for user-mode returns for x86. --- Based on next-20170308 --- arch/x86/Kconfig | 1 + arch/x86/entry/common.c | 3 +++ arch/x86/entry/entry_64.S | 6 ++++++ 3 files changed, 10 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 005df7c825f5..6d48e18e6f09 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -63,6 +63,7 @@ config X86 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_MIGHT_HAVE_PC_SERIO + select ARCH_NO_SYSCALL_VERIFY_PRE_USERMODE_STATE select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 370c42c7f046..525edbb77f03 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -22,6 +22,7 @@ #include <linux/context_tracking.h> #include <linux/user-return-notifier.h> #include <linux/uprobes.h> +#include <linux/syscalls.h> #include <asm/desc.h> #include <asm/traps.h> @@ -180,6 +181,8 @@ __visible inline void prepare_exit_to_usermode(struct pt_regs *regs) struct thread_info *ti = current_thread_info(); u32 cached_flags; + verify_pre_usermode_state(); + if (IS_ENABLED(CONFIG_PROVE_LOCKING) && WARN_ON(!irqs_disabled())) local_irq_disable(); diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index d2b2a2948ffe..795c31eebd09 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -201,6 +201,7 @@ entry_SYSCALL_64_fastpath: * It might end up jumping to the slow path. If it jumps, RAX * and all argument registers are clobbered. */ + call *sys_call_table(, %rax, 8) .Lentry_SYSCALL_64_after_fastpath_call: @@ -218,6 +219,11 @@ entry_SYSCALL_64_fastpath: testl $_TIF_ALLWORK_MASK, TASK_TI_flags(%r11) jnz 1f + /* + * Check user-mode state on fast path return, the same check is done + * under the slow path through syscall_return_slowpath. + */ + call verify_pre_usermode_state LOCKDEP_SYS_EXIT TRACE_IRQS_ON /* user mode is traced as IRQs on */ movq RIP(%rsp), %rcx -- 2.12.0.246.ga2ecc84866-goog
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[PATCH v1 1/4] syscalls: Restore address limit after a syscall Thomas Garnier <thgarnie@google.com> - 2017-03-08 23:40 +0100 Re: [PATCH v1 3/4] arm/syscalls: Specific usage of verify_pre_usermode_state Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-03-08 23:50 +0100 [PATCH v1 4/4] arm64/syscalls: Specific usage of verify_pre_usermode_state Thomas Garnier <thgarnie@google.com> - 2017-03-08 23:50 +0100 [PATCH v1 2/4] x86/syscalls: Specific usage of verify_pre_usermode_state Thomas Garnier <thgarnie@google.com> - 2017-03-09 00:40 +0100 [PATCH v1 3/4] arm/syscalls: Specific usage of verify_pre_usermode_state Thomas Garnier <thgarnie@google.com> - 2017-03-09 01:40 +0100
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