This is a note to let you know that I've just added the patch titled x86/speculation: Apply IBPB more strictly to avoid cross-process data leak to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86speculation_Apply_IBPB_more_strictly_to_avoid_cross-process_data_leak.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. Subject: x86/speculation: Apply IBPB more strictly to avoid cross-process data leak From: Jiri Kosina jkosina@xxxxxxx Date: Tue Sep 25 14:38:18 2018 +0200 From: Jiri Kosina jkosina@xxxxxxx commit dbfe2953f63c640463c630746cd5d9de8b2f63ae upstream Currently, IBPB is only issued in cases when switching into a non-dumpable process, the rationale being to protect such 'important and security sensitive' processess (such as GPG) from data leaking into a different userspace process via spectre v2. This is however completely insufficient to provide proper userspace-to-userpace spectrev2 protection, as any process can poison branch buffers before being scheduled out, and the newly scheduled process immediately becomes spectrev2 victim. In order to minimize the performance impact (for usecases that do require spectrev2 protection), issue the barrier only in cases when switching between processess where the victim can't be ptraced by the potential attacker (as in such cases, the attacker doesn't have to bother with branch buffers at all). [ tglx: Split up PTRACE_MODE_NOACCESS_CHK into PTRACE_MODE_SCHED and PTRACE_MODE_IBPB to be able to do ptrace() context tracking reasonably fine-grained ] Fixes: 18bf3c3ea8 ("x86/speculation: Use Indirect Branch Prediction Barrier in context switch") Originally-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx> Signed-off-by: Jiri Kosina <jkosina@xxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: "WoodhouseDavid" <dwmw@xxxxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: "SchauflerCasey" <casey.schaufler@xxxxxxxxx> Link: https://lkml.kernel.org/r/nycvar.YFH.7.76.1809251437340.15880@xxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/mm/tlb.c | 31 ++++++++++++++++++++----------- include/linux/ptrace.h | 21 +++++++++++++++++++-- kernel/ptrace.c | 10 ++++++++++ 3 files changed, 49 insertions(+), 13 deletions(-) --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -7,6 +7,7 @@ #include <linux/export.h> #include <linux/cpu.h> #include <linux/debugfs.h> +#include <linux/ptrace.h> #include <asm/tlbflush.h> #include <asm/mmu_context.h> @@ -180,6 +181,19 @@ static void sync_current_stack_to_mm(str } } +static bool ibpb_needed(struct task_struct *tsk, u64 last_ctx_id) +{ + /* + * Check if the current (previous) task has access to the memory + * of the @tsk (next) task. If access is denied, make sure to + * issue a IBPB to stop user->user Spectre-v2 attacks. + * + * Note: __ptrace_may_access() returns 0 or -ERRNO. + */ + return (tsk && tsk->mm && tsk->mm->context.ctx_id != last_ctx_id && + ptrace_may_access_sched(tsk, PTRACE_MODE_SPEC_IBPB)); +} + void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { @@ -256,18 +270,13 @@ void switch_mm_irqs_off(struct mm_struct * one process from doing Spectre-v2 attacks on another. * * As an optimization, flush indirect branches only when - * switching into processes that disable dumping. This - * protects high value processes like gpg, without having - * too high performance overhead. IBPB is *expensive*! - * - * This will not flush branches when switching into kernel - * threads. It will also not flush if we switch to idle - * thread and back to the same process. It will flush if we - * switch to a different non-dumpable process. + * switching into a processes that can't be ptrace by the + * current one (as in such case, attacker has much more + * convenient way how to tamper with the next process than + * branch buffer poisoning). */ - if (tsk && tsk->mm && - tsk->mm->context.ctx_id != last_ctx_id && - get_dumpable(tsk->mm) != SUID_DUMP_USER) + if (static_cpu_has(X86_FEATURE_USE_IBPB) && + ibpb_needed(tsk, last_ctx_id)) indirect_branch_prediction_barrier(); if (IS_ENABLED(CONFIG_VMAP_STACK)) { --- a/include/linux/ptrace.h +++ b/include/linux/ptrace.h @@ -62,14 +62,17 @@ extern void exit_ptrace(struct task_stru #define PTRACE_MODE_READ 0x01 #define PTRACE_MODE_ATTACH 0x02 #define PTRACE_MODE_NOAUDIT 0x04 -#define PTRACE_MODE_FSCREDS 0x08 -#define PTRACE_MODE_REALCREDS 0x10 +#define PTRACE_MODE_FSCREDS 0x08 +#define PTRACE_MODE_REALCREDS 0x10 +#define PTRACE_MODE_SCHED 0x20 +#define PTRACE_MODE_IBPB 0x40 /* shorthands for READ/ATTACH and FSCREDS/REALCREDS combinations */ #define PTRACE_MODE_READ_FSCREDS (PTRACE_MODE_READ | PTRACE_MODE_FSCREDS) #define PTRACE_MODE_READ_REALCREDS (PTRACE_MODE_READ | PTRACE_MODE_REALCREDS) #define PTRACE_MODE_ATTACH_FSCREDS (PTRACE_MODE_ATTACH | PTRACE_MODE_FSCREDS) #define PTRACE_MODE_ATTACH_REALCREDS (PTRACE_MODE_ATTACH | PTRACE_MODE_REALCREDS) +#define PTRACE_MODE_SPEC_IBPB (PTRACE_MODE_ATTACH_REALCREDS | PTRACE_MODE_IBPB) /** * ptrace_may_access - check whether the caller is permitted to access @@ -87,6 +90,20 @@ extern void exit_ptrace(struct task_stru */ extern bool ptrace_may_access(struct task_struct *task, unsigned int mode); +/** + * ptrace_may_access - check whether the caller is permitted to access + * a target task. + * @task: target task + * @mode: selects type of access and caller credentials + * + * Returns true on success, false on denial. + * + * Similar to ptrace_may_access(). Only to be called from context switch + * code. Does not call into audit and the regular LSM hooks due to locking + * constraints. + */ +extern bool ptrace_may_access_sched(struct task_struct *task, unsigned int mode); + static inline int ptrace_reparented(struct task_struct *child) { return !same_thread_group(child->real_parent, child->parent); --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -261,6 +261,9 @@ static int ptrace_check_attach(struct ta static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode) { + if (mode & PTRACE_MODE_SCHED) + return false; + if (mode & PTRACE_MODE_NOAUDIT) return has_ns_capability_noaudit(current, ns, CAP_SYS_PTRACE); else @@ -328,9 +331,16 @@ ok: !ptrace_has_cap(mm->user_ns, mode))) return -EPERM; + if (mode & PTRACE_MODE_SCHED) + return 0; return security_ptrace_access_check(task, mode); } +bool ptrace_may_access_sched(struct task_struct *task, unsigned int mode) +{ + return __ptrace_may_access(task, mode | PTRACE_MODE_SCHED); +} + bool ptrace_may_access(struct task_struct *task, unsigned int mode) { int err; Patches currently in stable-queue which might be from jkosina@xxxxxxx are queue-4.14/x86speculation_Prepare_for_conditional_IBPB_in_switch_mm.patch queue-4.14/x86speculation_Rework_SMT_state_change.patch queue-4.14/x86Kconfig_Select_SCHED_SMT_if_SMP_enabled.patch queue-4.14/x86speculation_Move_STIPBIBPB_string_conditionals_out_of_cpu_show_common().patch queue-4.14/x86speculation_Propagate_information_about_RSB_filling_mitigation_to_sysfs.patch queue-4.14/x86speculation_Prepare_arch_smt_update_for_PRCTL_mode.patch queue-4.14/x86speculation_Enable_cross-hyperthread_spectre_v2_STIBP_mitigation.patch queue-4.14/x86speculation_Prevent_stale_SPEC_CTRL_msr_content.patch queue-4.14/ptrace_Remove_unused_ptrace_may_access_sched_and_MODE_IBRS.patch queue-4.14/x86speculation_Mark_string_arrays_const_correctly.patch queue-4.14/x86process_Consolidate_and_simplify_switch_to_xtra_code.patch queue-4.14/x86speculation_Apply_IBPB_more_strictly_to_avoid_cross-process_data_leak.patch queue-4.14/x86speculation_Enable_prctl_mode_for_spectre_v2_user.patch queue-4.14/x86speculation_Rename_SSBD_update_functions.patch queue-4.14/x86speculation_Add_command_line_control_for_indirect_branch_speculation.patch queue-4.14/x86l1tf_Show_actual_SMT_state.patch queue-4.14/x86speculation_Split_out_TIF_update.patch queue-4.14/schedsmt_Make_sched_smt_present_track_topology.patch queue-4.14/schedsmt_Expose_sched_smt_present_static_key.patch queue-4.14/x86speculation_Reorder_the_spec_v2_code.patch queue-4.14/x86speculation_Add_prctl()_control_for_indirect_branch_speculation.patch queue-4.14/x86speculation_Provide_IBPB_always_command_line_options.patch queue-4.14/x86speculation_Prepare_for_per_task_indirect_branch_speculation_control.patch queue-4.14/x86speculataion_Mark_command_line_parser_data___initdata.patch queue-4.14/x86speculation_Disable_STIBP_when_enhanced_IBRS_is_in_use.patch queue-4.14/x86speculation_Reorganize_speculation_control_MSRs_update.patch queue-4.14/x86speculation_Clean_up_spectre_v2_parse_cmdline().patch queue-4.14/x86speculation_Update_the_TIF_SSBD_comment.patch queue-4.14/x86speculation_Add_seccomp_Spectre_v2_user_space_protection_mode.patch queue-4.14/x86speculation_Unify_conditional_spectre_v2_print_functions.patch queue-4.14/x86speculation_Avoid___switch_to_xtra_calls.patch queue-4.14/x86speculation_Remove_unnecessary_ret_variable_in_cpu_show_common().patch