diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-11-16 09:27:13 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-11-16 09:27:13 -0800 |
commit | 2ebc8ec86fe0f3f3acf9ba9b41a368f819e7807e (patch) | |
tree | c0b3d4f14ae6dd98318d78fcf7d16f47954e06a4 | |
parent | df6e61d4ca268dc8706db38222fde9f04701566c (diff) | |
parent | 89480801a17a3069f45169d40b828c8e511aa005 (diff) |
Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
[S390] kprobes: Fix the return address of multiple kretprobes
[S390] kprobes: disable interrupts throughout
[S390] ftrace: build without frame pointers on s390
[S390] mm: add devmem_is_allowed() for STRICT_DEVMEM checking
[S390] vmlogrdr: purge after recording is switched off
[S390] cio: fix incorrect ccw_device_init_count
[S390] tape: add medium state notifications
[S390] fix get_user_pages_fast
-rw-r--r-- | arch/s390/Kconfig.debug | 12 | ||||
-rw-r--r-- | arch/s390/include/asm/page.h | 5 | ||||
-rw-r--r-- | arch/s390/kernel/kprobes.c | 70 | ||||
-rw-r--r-- | arch/s390/mm/gup.c | 7 | ||||
-rw-r--r-- | drivers/s390/char/tape_core.c | 68 | ||||
-rw-r--r-- | drivers/s390/char/vmlogrdr.c | 36 | ||||
-rw-r--r-- | drivers/s390/cio/device.c | 11 | ||||
-rw-r--r-- | kernel/trace/Kconfig | 2 |
8 files changed, 167 insertions, 44 deletions
diff --git a/arch/s390/Kconfig.debug b/arch/s390/Kconfig.debug index 45e0c6199f36..05221b13ffb1 100644 --- a/arch/s390/Kconfig.debug +++ b/arch/s390/Kconfig.debug @@ -6,6 +6,18 @@ config TRACE_IRQFLAGS_SUPPORT source "lib/Kconfig.debug" +config STRICT_DEVMEM + def_bool y + prompt "Filter access to /dev/mem" + ---help--- + This option restricts access to /dev/mem. If this option is + disabled, you allow userspace access to all memory, including + kernel and userspace memory. Accidental memory access is likely + to be disastrous. + Memory access is required for experts who want to debug the kernel. + + If you are unsure, say Y. + config DEBUG_STRICT_USER_COPY_CHECKS bool "Strict user copy size checks" ---help--- diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index a8729ea7e9ac..3c987e9ec8d6 100644 --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -130,6 +130,11 @@ struct page; void arch_free_page(struct page *page, int order); void arch_alloc_page(struct page *page, int order); +static inline int devmem_is_allowed(unsigned long pfn) +{ + return 0; +} + #define HAVE_ARCH_FREE_PAGE #define HAVE_ARCH_ALLOC_PAGE diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c index d60fc4398516..2564793ec2b6 100644 --- a/arch/s390/kernel/kprobes.c +++ b/arch/s390/kernel/kprobes.c @@ -30,6 +30,7 @@ #include <asm/sections.h> #include <linux/module.h> #include <linux/slab.h> +#include <linux/hardirq.h> DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); @@ -212,7 +213,7 @@ static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs) /* Set the PER control regs, turns on single step for this address */ __ctl_load(kprobe_per_regs, 9, 11); regs->psw.mask |= PSW_MASK_PER; - regs->psw.mask &= ~(PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK); + regs->psw.mask &= ~(PSW_MASK_IO | PSW_MASK_EXT); } static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb) @@ -239,7 +240,7 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs, __get_cpu_var(current_kprobe) = p; /* Save the interrupt and per flags */ kcb->kprobe_saved_imask = regs->psw.mask & - (PSW_MASK_PER | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK); + (PSW_MASK_PER | PSW_MASK_IO | PSW_MASK_EXT); /* Save the control regs that govern PER */ __ctl_store(kcb->kprobe_saved_ctl, 9, 11); } @@ -316,8 +317,6 @@ static int __kprobes kprobe_handler(struct pt_regs *regs) return 1; ss_probe: - if (regs->psw.mask & (PSW_MASK_PER | PSW_MASK_IO)) - local_irq_disable(); prepare_singlestep(p, regs); kcb->kprobe_status = KPROBE_HIT_SS; return 1; @@ -350,6 +349,7 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p, struct hlist_node *node, *tmp; unsigned long flags, orig_ret_address = 0; unsigned long trampoline_address = (unsigned long)&kretprobe_trampoline; + kprobe_opcode_t *correct_ret_addr = NULL; INIT_HLIST_HEAD(&empty_rp); kretprobe_hash_lock(current, &head, &flags); @@ -372,10 +372,32 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p, /* another task is sharing our hash bucket */ continue; - if (ri->rp && ri->rp->handler) - ri->rp->handler(ri, regs); + orig_ret_address = (unsigned long)ri->ret_addr; + + if (orig_ret_address != trampoline_address) + /* + * This is the real return address. Any other + * instances associated with this task are for + * other calls deeper on the call stack + */ + break; + } + + kretprobe_assert(ri, orig_ret_address, trampoline_address); + + correct_ret_addr = ri->ret_addr; + hlist_for_each_entry_safe(ri, node, tmp, head, hlist) { + if (ri->task != current) + /* another task is sharing our hash bucket */ + continue; orig_ret_address = (unsigned long)ri->ret_addr; + + if (ri->rp && ri->rp->handler) { + ri->ret_addr = correct_ret_addr; + ri->rp->handler(ri, regs); + } + recycle_rp_inst(ri, &empty_rp); if (orig_ret_address != trampoline_address) { @@ -387,7 +409,7 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p, break; } } - kretprobe_assert(ri, orig_ret_address, trampoline_address); + regs->psw.addr = orig_ret_address | PSW_ADDR_AMODE; reset_current_kprobe(); @@ -465,8 +487,6 @@ static int __kprobes post_kprobe_handler(struct pt_regs *regs) goto out; } reset_current_kprobe(); - if (regs->psw.mask & (PSW_MASK_PER | PSW_MASK_IO)) - local_irq_enable(); out: preempt_enable_no_resched(); @@ -482,7 +502,7 @@ out: return 1; } -int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr) +static int __kprobes kprobe_trap_handler(struct pt_regs *regs, int trapnr) { struct kprobe *cur = kprobe_running(); struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); @@ -508,8 +528,6 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr) restore_previous_kprobe(kcb); else { reset_current_kprobe(); - if (regs->psw.mask & (PSW_MASK_PER | PSW_MASK_IO)) - local_irq_enable(); } preempt_enable_no_resched(); break; @@ -553,6 +571,18 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr) return 0; } +int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr) +{ + int ret; + + if (regs->psw.mask & (PSW_MASK_IO | PSW_MASK_EXT)) + local_irq_disable(); + ret = kprobe_trap_handler(regs, trapnr); + if (regs->psw.mask & (PSW_MASK_IO | PSW_MASK_EXT)) + local_irq_restore(regs->psw.mask & ~PSW_MASK_PER); + return ret; +} + /* * Wrapper routine to for handling exceptions. */ @@ -560,8 +590,12 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data) { struct die_args *args = (struct die_args *)data; + struct pt_regs *regs = args->regs; int ret = NOTIFY_DONE; + if (regs->psw.mask & (PSW_MASK_IO | PSW_MASK_EXT)) + local_irq_disable(); + switch (val) { case DIE_BPT: if (kprobe_handler(args->regs)) @@ -572,16 +606,17 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self, ret = NOTIFY_STOP; break; case DIE_TRAP: - /* kprobe_running() needs smp_processor_id() */ - preempt_disable(); - if (kprobe_running() && - kprobe_fault_handler(args->regs, args->trapnr)) + if (!preemptible() && kprobe_running() && + kprobe_trap_handler(args->regs, args->trapnr)) ret = NOTIFY_STOP; - preempt_enable(); break; default: break; } + + if (regs->psw.mask & (PSW_MASK_IO | PSW_MASK_EXT)) + local_irq_restore(regs->psw.mask & ~PSW_MASK_PER); + return ret; } @@ -595,6 +630,7 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs) /* setup return addr to the jprobe handler routine */ regs->psw.addr = (unsigned long)(jp->entry) | PSW_ADDR_AMODE; + regs->psw.mask &= ~(PSW_MASK_IO | PSW_MASK_EXT); /* r14 is the function return address */ kcb->jprobe_saved_r14 = (unsigned long)regs->gprs[14]; diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c index 38e641cdd977..45b405ca2567 100644 --- a/arch/s390/mm/gup.c +++ b/arch/s390/mm/gup.c @@ -20,18 +20,17 @@ static inline int gup_pte_range(pmd_t *pmdp, pmd_t pmd, unsigned long addr, unsigned long end, int write, struct page **pages, int *nr) { - unsigned long mask, result; + unsigned long mask; pte_t *ptep, pte; struct page *page; - result = write ? 0 : _PAGE_RO; - mask = result | _PAGE_INVALID | _PAGE_SPECIAL; + mask = (write ? _PAGE_RO : 0) | _PAGE_INVALID | _PAGE_SPECIAL; ptep = ((pte_t *) pmd_deref(pmd)) + pte_index(addr); do { pte = *ptep; barrier(); - if ((pte_val(pte) & mask) != result) + if ((pte_val(pte) & mask) != 0) return 0; VM_BUG_ON(!pfn_valid(pte_pfn(pte))); page = pte_page(pte); diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c index 6c408670e08d..b3a3e8e8656e 100644 --- a/drivers/s390/char/tape_core.c +++ b/drivers/s390/char/tape_core.c @@ -209,29 +209,79 @@ tape_state_set(struct tape_device *device, enum tape_state newstate) wake_up(&device->state_change_wq); } +struct tape_med_state_work_data { + struct tape_device *device; + enum tape_medium_state state; + struct work_struct work; +}; + +static void +tape_med_state_work_handler(struct work_struct *work) +{ + static char env_state_loaded[] = "MEDIUM_STATE=LOADED"; + static char env_state_unloaded[] = "MEDIUM_STATE=UNLOADED"; + struct tape_med_state_work_data *p = + container_of(work, struct tape_med_state_work_data, work); + struct tape_device *device = p->device; + char *envp[] = { NULL, NULL }; + + switch (p->state) { + case MS_UNLOADED: + pr_info("%s: The tape cartridge has been successfully " + "unloaded\n", dev_name(&device->cdev->dev)); + envp[0] = env_state_unloaded; + kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp); + break; + case MS_LOADED: + pr_info("%s: A tape cartridge has been mounted\n", + dev_name(&device->cdev->dev)); + envp[0] = env_state_loaded; + kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp); + break; + default: + break; + } + tape_put_device(device); + kfree(p); +} + +static void +tape_med_state_work(struct tape_device *device, enum tape_medium_state state) +{ + struct tape_med_state_work_data *p; + + p = kzalloc(sizeof(*p), GFP_ATOMIC); + if (p) { + INIT_WORK(&p->work, tape_med_state_work_handler); + p->device = tape_get_device(device); + p->state = state; + schedule_work(&p->work); + } +} + void tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate) { - if (device->medium_state == newstate) + enum tape_medium_state oldstate; + + oldstate = device->medium_state; + if (oldstate == newstate) return; + device->medium_state = newstate; switch(newstate){ case MS_UNLOADED: device->tape_generic_status |= GMT_DR_OPEN(~0); - if (device->medium_state == MS_LOADED) - pr_info("%s: The tape cartridge has been successfully " - "unloaded\n", dev_name(&device->cdev->dev)); + if (oldstate == MS_LOADED) + tape_med_state_work(device, MS_UNLOADED); break; case MS_LOADED: device->tape_generic_status &= ~GMT_DR_OPEN(~0); - if (device->medium_state == MS_UNLOADED) - pr_info("%s: A tape cartridge has been mounted\n", - dev_name(&device->cdev->dev)); + if (oldstate == MS_UNLOADED) + tape_med_state_work(device, MS_LOADED); break; default: - // print nothing break; } - device->medium_state = newstate; wake_up(&device->state_change_wq); } diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c index 9f661426e4a1..1cc726b98ec8 100644 --- a/drivers/s390/char/vmlogrdr.c +++ b/drivers/s390/char/vmlogrdr.c @@ -249,27 +249,25 @@ static int vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, char cp_command[80]; char cp_response[160]; char *onoff, *qid_string; + int rc; - memset(cp_command, 0x00, sizeof(cp_command)); - memset(cp_response, 0x00, sizeof(cp_response)); - - onoff = ((action == 1) ? "ON" : "OFF"); + onoff = ((action == 1) ? "ON" : "OFF"); qid_string = ((recording_class_AB == 1) ? " QID * " : ""); - /* + /* * The recording commands needs to be called with option QID * for guests that have previlege classes A or B. * Purging has to be done as separate step, because recording * can't be switched on as long as records are on the queue. * Doing both at the same time doesn't work. */ - - if (purge) { + if (purge && (action == 1)) { + memset(cp_command, 0x00, sizeof(cp_command)); + memset(cp_response, 0x00, sizeof(cp_response)); snprintf(cp_command, sizeof(cp_command), "RECORDING %s PURGE %s", logptr->recording_name, qid_string); - cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); } @@ -279,19 +277,33 @@ static int vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, logptr->recording_name, onoff, qid_string); - cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); /* The recording command will usually answer with 'Command complete' * on success, but when the specific service was never connected * before then there might be an additional informational message * 'HCPCRC8072I Recording entry not found' before the - * 'Command complete'. So I use strstr rather then the strncmp. + * 'Command complete'. So I use strstr rather then the strncmp. */ if (strstr(cp_response,"Command complete")) - return 0; + rc = 0; else - return -EIO; + rc = -EIO; + /* + * If we turn recording off, we have to purge any remaining records + * afterwards, as a large number of queued records may impact z/VM + * performance. + */ + if (purge && (action == 0)) { + memset(cp_command, 0x00, sizeof(cp_command)); + memset(cp_response, 0x00, sizeof(cp_response)); + snprintf(cp_command, sizeof(cp_command), + "RECORDING %s PURGE %s", + logptr->recording_name, + qid_string); + cpcmd(cp_command, cp_response, sizeof(cp_response), NULL); + } + return rc; } diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c index 2ff8a22d4257..e8391b89eff4 100644 --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -1455,7 +1455,16 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process) break; case IO_SCH_UNREG_ATTACH: case IO_SCH_UNREG: - if (cdev) + if (!cdev) + break; + if (cdev->private->state == DEV_STATE_SENSE_ID) { + /* + * Note: delayed work triggered by this event + * and repeated calls to sch_event are synchronized + * by the above check for work_pending(cdev). + */ + dev_fsm_event(cdev, DEV_EVENT_NOTOPER); + } else ccw_device_set_notoper(cdev); break; case IO_SCH_NOP: diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index e04b8bcdef88..ea37e2ff4164 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -126,7 +126,7 @@ if FTRACE config FUNCTION_TRACER bool "Kernel Function Tracer" depends on HAVE_FUNCTION_TRACER - select FRAME_POINTER if (!ARM_UNWIND) + select FRAME_POINTER if !ARM_UNWIND && !S390 select KALLSYMS select GENERIC_TRACER select CONTEXT_SWITCH_TRACER |