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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 

Pull s390 fixes from Martin Schwidefsky:
 "An update for the BFP jit to the latest and greatest, two patches to
  get kdump working again, the random-abort ptrace extention for
  transactional execution, the z90crypt module alias for ap and a tiny
  cleanup"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/zcrypt: Alias for new zcrypt device driver base module
  s390/kdump: Allow copy_oldmem_page() copy to virtual memory
  s390/kdump: Disable mmap for s390
  s390/bpf,jit: add pkt_type support
  s390/bpf,jit: address randomize and write protect jit code
  s390/bpf,jit: use generic jit dumper
  s390/bpf,jit: call module_free() from any context
  s390/qdio: remove unused variable
  s390/ptrace: PTRACE_TE_ABORT_RAND
This commit is contained in:
Linus Torvalds 2013-07-19 15:08:12 -07:00
parent b8a33fc725 9da3545d82
commit 89a8c5940d
9 changed files with 190 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/s390/include/asm/processor.h
View File

@ -91,7 +91,15 @@ struct thread_struct {
#endif
};
#define PER_FLAG_NO_TE 1UL /* Flag to disable transactions. */
/* Flag to disable transactions. */
#define PER_FLAG_NO_TE 1UL
/* Flag to enable random transaction aborts. */
#define PER_FLAG_TE_ABORT_RAND 2UL
/* Flag to specify random transaction abort mode:
* - abort each transaction at a random instruction before TEND if set.
* - abort random transactions at a random instruction if cleared.
*/
#define PER_FLAG_TE_ABORT_RAND_TEND 4UL
typedef struct thread_struct thread_struct;

4
arch/s390/include/asm/switch_to.h
View File

@ -10,7 +10,7 @@
#include <linux/thread_info.h>
extern struct task_struct *__switch_to(void *, void *);
extern void update_per_regs(struct task_struct *task);
extern void update_cr_regs(struct task_struct *task);
static inline void save_fp_regs(s390_fp_regs *fpregs)
{
@ -86,7 +86,7 @@ static inline void restore_access_regs(unsigned int *acrs)
restore_fp_regs(&next->thread.fp_regs); \
restore_access_regs(&next->thread.acrs[0]); \
restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
update_per_regs(next); \
update_cr_regs(next); \
} \
prev = __switch_to(prev,next); \
} while (0)

1
arch/s390/include/uapi/asm/ptrace.h
View File

@ -400,6 +400,7 @@ typedef struct
#define PTRACE_POKE_SYSTEM_CALL 0x5008
#define PTRACE_ENABLE_TE 0x5009
#define PTRACE_DISABLE_TE 0x5010
#define PTRACE_TE_ABORT_RAND 0x5011
/*
* PT_PROT definition is loosely based on hppa bsd definition in

51
arch/s390/kernel/crash_dump.c
View File

@ -21,6 +21,48 @@
#define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
#define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y))))
/*
* Return physical address for virtual address
*/
static inline void *load_real_addr(void *addr)
{
unsigned long real_addr;
asm volatile(
" lra %0,0(%1)\n"
" jz 0f\n"
" la %0,0\n"
"0:"
: "=a" (real_addr) : "a" (addr) : "cc");
return (void *)real_addr;
}
/*
* Copy up to one page to vmalloc or real memory
*/
static ssize_t copy_page_real(void *buf, void *src, size_t csize)
{
size_t size;
if (is_vmalloc_addr(buf)) {
BUG_ON(csize >= PAGE_SIZE);
/* If buf is not page aligned, copy first part */
size = min(roundup(__pa(buf), PAGE_SIZE) - __pa(buf), csize);
if (size) {
if (memcpy_real(load_real_addr(buf), src, size))
return -EFAULT;
buf += size;
src += size;
}
/* Copy second part */
size = csize - size;
return (size) ? memcpy_real(load_real_addr(buf), src, size) : 0;
} else {
return memcpy_real(buf, src, csize);
}
}
/*
* Copy one page from "oldmem"
*
@ -32,6 +74,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
size_t csize, unsigned long offset, int userbuf)
{
unsigned long src;
int rc;
if (!csize)
return 0;
@ -43,11 +86,11 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
src < OLDMEM_BASE + OLDMEM_SIZE)
src -= OLDMEM_BASE;
if (userbuf)
copy_to_user_real((void __force __user *) buf, (void *) src,
csize);
rc = copy_to_user_real((void __force __user *) buf,
(void *) src, csize);
else
memcpy_real(buf, (void *) src, csize);
return csize;
rc = copy_page_real(buf, (void *) src, csize);
return (rc == 0) ? csize : rc;
}
/*

50
arch/s390/kernel/ptrace.c
View File

@ -47,7 +47,7 @@ enum s390_regset {
REGSET_GENERAL_EXTENDED,
};
void update_per_regs(struct task_struct *task)
void update_cr_regs(struct task_struct *task)
{
struct pt_regs *regs = task_pt_regs(task);
struct thread_struct *thread = &task->thread;
@ -56,17 +56,25 @@ void update_per_regs(struct task_struct *task)
#ifdef CONFIG_64BIT
/* Take care of the enable/disable of transactional execution. */
if (MACHINE_HAS_TE) {
unsigned long cr0, cr0_new;
unsigned long cr[3], cr_new[3];
__ctl_store(cr0, 0, 0);
/* set or clear transaction execution bits 8 and 9. */
__ctl_store(cr, 0, 2);
cr_new[1] = cr[1];
/* Set or clear transaction execution TXC/PIFO bits 8 and 9. */
if (task->thread.per_flags & PER_FLAG_NO_TE)
cr0_new = cr0 & ~(3UL << 54);
cr_new[0] = cr[0] & ~(3UL << 54);
else
cr0_new = cr0 | (3UL << 54);
/* Only load control register 0 if necessary. */
if (cr0 != cr0_new)
__ctl_load(cr0_new, 0, 0);
cr_new[0] = cr[0] | (3UL << 54);
/* Set or clear transaction execution TDC bits 62 and 63. */
cr_new[2] = cr[2] & ~3UL;
if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
cr_new[2] |= 1UL;
else
cr_new[2] |= 2UL;
}
if (memcmp(&cr_new, &cr, sizeof(cr)))
__ctl_load(cr_new, 0, 2);
}
#endif
/* Copy user specified PER registers */
@ -100,14 +108,14 @@ void user_enable_single_step(struct task_struct *task)
{
set_tsk_thread_flag(task, TIF_SINGLE_STEP);
if (task == current)
update_per_regs(task);
update_cr_regs(task);
}
void user_disable_single_step(struct task_struct *task)
{
clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
if (task == current)
update_per_regs(task);
update_cr_regs(task);
}
/*
@ -447,6 +455,26 @@ long arch_ptrace(struct task_struct *child, long request,
if (!MACHINE_HAS_TE)
return -EIO;
child->thread.per_flags |= PER_FLAG_NO_TE;
child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
return 0;
case PTRACE_TE_ABORT_RAND:
if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
return -EIO;
switch (data) {
case 0UL:
child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
break;
case 1UL:
child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
break;
case 2UL:
child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
break;
default:
return -EINVAL;
}
return 0;
default:
/* Removing high order bit from addr (only for 31 bit). */

113
arch/s390/net/bpf_jit_comp.c
View File

@ -9,6 +9,8 @@
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/filter.h>
#include <linux/random.h>
#include <linux/init.h>
#include <asm/cacheflush.h>
#include <asm/processor.h>
#include <asm/facility.h>
@ -221,6 +223,37 @@ static void bpf_jit_epilogue(struct bpf_jit *jit)
EMIT2(0x07fe);
}
/* Helper to find the offset of pkt_type in sk_buff
* Make sure its still a 3bit field starting at the MSBs within a byte.
*/
#define PKT_TYPE_MAX 0xe0
static int pkt_type_offset;
static int __init bpf_pkt_type_offset_init(void)
{
struct sk_buff skb_probe = {
.pkt_type = ~0,
};
char *ct = (char *)&skb_probe;
int off;
pkt_type_offset = -1;
for (off = 0; off < sizeof(struct sk_buff); off++) {
if (!ct[off])
continue;
if (ct[off] == PKT_TYPE_MAX)
pkt_type_offset = off;
else {
/* Found non matching bit pattern, fix needed. */
WARN_ON_ONCE(1);
pkt_type_offset = -1;
return -1;
}
}
return 0;
}
device_initcall(bpf_pkt_type_offset_init);
/*
* make sure we dont leak kernel information to user
*/
@ -720,6 +753,16 @@ call_fn: /* lg %r1,<d(function)>(%r13) */
EMIT4_DISP(0x88500000, 12);
}
break;
case BPF_S_ANC_PKTTYPE:
if (pkt_type_offset < 0)
goto out;
/* lhi %r5,0 */
EMIT4(0xa7580000);
/* ic %r5,<d(pkt_type_offset)>(%r2) */
EMIT4_DISP(0x43502000, pkt_type_offset);
/* srl %r5,5 */
EMIT4_DISP(0x88500000, 5);
break;
case BPF_S_ANC_CPU: /* A = smp_processor_id() */
#ifdef CONFIG_SMP
/* l %r5,<d(cpu_nr)> */
@ -738,8 +781,41 @@ out:
return -1;
}
/*
* Note: for security reasons, bpf code will follow a randomly
* sized amount of illegal instructions.
*/
struct bpf_binary_header {
unsigned int pages;
u8 image[];
};
static struct bpf_binary_header *bpf_alloc_binary(unsigned int bpfsize,
u8 **image_ptr)
{
struct bpf_binary_header *header;
unsigned int sz, hole;
/* Most BPF filters are really small, but if some of them fill a page,
* allow at least 128 extra bytes for illegal instructions.
*/
sz = round_up(bpfsize + sizeof(*header) + 128, PAGE_SIZE);
header = module_alloc(sz);
if (!header)
return NULL;
memset(header, 0, sz);
header->pages = sz / PAGE_SIZE;
hole = sz - bpfsize + sizeof(*header);
/* Insert random number of illegal instructions before BPF code
* and make sure the first instruction starts at an even address.
*/
*image_ptr = &header->image[(prandom_u32() % hole) & -2];
return header;
}
void bpf_jit_compile(struct sk_filter *fp)
{
struct bpf_binary_header *header = NULL;
unsigned long size, prg_len, lit_len;
struct bpf_jit jit, cjit;
unsigned int *addrs;
@ -772,12 +848,11 @@ void bpf_jit_compile(struct sk_filter *fp)
} else if (jit.prg == cjit.prg && jit.lit == cjit.lit) {
prg_len = jit.prg - jit.start;
lit_len = jit.lit - jit.mid;
size = max_t(unsigned long, prg_len + lit_len,
sizeof(struct work_struct));
size = prg_len + lit_len;
if (size >= BPF_SIZE_MAX)
goto out;
jit.start = module_alloc(size);
if (!jit.start)
header = bpf_alloc_binary(size, &jit.start);
if (!header)
goto out;
jit.prg = jit.mid = jit.start + prg_len;
jit.lit = jit.end = jit.start + prg_len + lit_len;
@ -788,37 +863,25 @@ void bpf_jit_compile(struct sk_filter *fp)
cjit = jit;
}
if (bpf_jit_enable > 1) {
pr_err("flen=%d proglen=%lu pass=%d image=%p\n",
fp->len, jit.end - jit.start, pass, jit.start);
if (jit.start) {
printk(KERN_ERR "JIT code:\n");
bpf_jit_dump(fp->len, jit.end - jit.start, pass, jit.start);
if (jit.start)
print_fn_code(jit.start, jit.mid - jit.start);
print_hex_dump(KERN_ERR, "JIT literals:\n",
DUMP_PREFIX_ADDRESS, 16, 1,
jit.mid, jit.end - jit.mid, false);
}
}
if (jit.start)
if (jit.start) {
set_memory_ro((unsigned long)header, header->pages);
fp->bpf_func = (void *) jit.start;
}
out:
kfree(addrs);
}
static void jit_free_defer(struct work_struct *arg)
{
module_free(NULL, arg);
}
/* run from softirq, we must use a work_struct to call
* module_free() from process context
*/
void bpf_jit_free(struct sk_filter *fp)
{
struct work_struct *work;
unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK;
struct bpf_binary_header *header = (void *)addr;
if (fp->bpf_func == sk_run_filter)
return;
work = (struct work_struct *)fp->bpf_func;
INIT_WORK(work, jit_free_defer);
schedule_work(work);
set_memory_rw(addr, header->pages);
module_free(NULL, header);
}

4
drivers/s390/cio/qdio_main.c
View File

@ -1497,7 +1497,7 @@ static inline int buf_in_between(int bufnr, int start, int count)
static int handle_inbound(struct qdio_q *q, unsigned int callflags,
int bufnr, int count)
{
int used, diff;
int diff;
qperf_inc(q, inbound_call);
@ -1530,7 +1530,7 @@ static int handle_inbound(struct qdio_q *q, unsigned int callflags,
set:
count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
used = atomic_add_return(count, &q->nr_buf_used) - count;
atomic_add(count, &q->nr_buf_used);
if (need_siga_in(q))
return qdio_siga_input(q);

1
drivers/s390/crypto/ap_bus.c
View File

@ -71,6 +71,7 @@ MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("Adjunct Processor Bus driver, " \
"Copyright IBM Corp. 2006, 2012");
MODULE_LICENSE("GPL");
MODULE_ALIAS("z90crypt");
/*
* Module parameter

2
fs/proc/vmcore.c
View File

@ -223,7 +223,7 @@ static inline char *alloc_elfnotes_buf(size_t notes_sz)
* regions in the 1st kernel pointed to by PT_LOAD entries) into
* virtually contiguous user-space in ELF layout.
*/
#ifdef CONFIG_MMU
#if defined(CONFIG_MMU) && !defined(CONFIG_S390)
static int mmap_vmcore(struct file *file, struct vm_area_struct *vma)
{
size_t size = vma->vm_end - vma->vm_start;