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Merge branch 'akpm' (patches from Andrew) 

Merge misc fixes from Andrew Morton:
 "17 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  arch: define weak abort()
  mm, oom_reaper: fix memory corruption
  kernel: make groups_sort calling a responsibility group_info allocators
  mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'
  tools/slabinfo-gnuplot: force to use bash shell
  kcov: fix comparison callback signature
  mm/slab.c: do not hash pointers when debugging slab
  mm/page_alloc.c: avoid excessive IRQ disabled times in free_unref_page_list()
  mm/memory.c: mark wp_huge_pmd() inline to prevent build failure
  scripts/faddr2line: fix CROSS_COMPILE unset error
  Documentation/vm/zswap.txt: update with same-value filled page feature
  exec: avoid gcc-8 warning for get_task_comm
  autofs: fix careless error in recent commit
  string.h: workaround for increased stack usage
  mm/kmemleak.c: make cond_resched() rate-limiting more efficient
  lib/rbtree,drm/mm: add rbtree_replace_node_cached()
  include/linux/idr.h: add #include <linux/bug.h>
This commit is contained in:
Linus Torvalds 2017-12-14 16:35:20 -08:00
parent d455df0bcc 7c2c11b208
commit 18d40eae7f
30 changed files with 125 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
Documentation/vm/zswap.txt
View File

@ -98,5 +98,25 @@ request is made for a page in an old zpool, it is uncompressed using its
original compressor. Once all pages are removed from an old zpool, the zpool
and its compressor are freed.
Some of the pages in zswap are same-value filled pages (i.e. contents of the
page have same value or repetitive pattern). These pages include zero-filled
pages and they are handled differently. During store operation, a page is
checked if it is a same-value filled page before compressing it. If true, the
compressed length of the page is set to zero and the pattern or same-filled
value is stored.
Same-value filled pages identification feature is enabled by default and can be
disabled at boot time by setting the "same_filled_pages_enabled" attribute to 0,
e.g. zswap.same_filled_pages_enabled=0. It can also be enabled and disabled at
runtime using the sysfs "same_filled_pages_enabled" attribute, e.g.
echo 1 > /sys/module/zswap/parameters/same_filled_pages_enabled
When zswap same-filled page identification is disabled at runtime, it will stop
checking for the same-value filled pages during store operation. However, the
existing pages which are marked as same-value filled pages remain stored
unchanged in zswap until they are either loaded or invalidated.
A debugfs interface is provided for various statistic about pool size, number
of pages stored, and various counters for the reasons pages are rejected.
of pages stored, same-value filled pages and various counters for the reasons
pages are rejected.

1
arch/s390/kernel/compat_linux.c
View File

@ -263,6 +263,7 @@ COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplis
return retval;
}
groups_sort(group_info);
retval = set_current_groups(group_info);
put_group_info(group_info);

8
drivers/gpu/drm/drm_mm.c
View File

@ -575,21 +575,23 @@ EXPORT_SYMBOL(drm_mm_remove_node);
*/
void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new)
{
struct drm_mm *mm = old->mm;
DRM_MM_BUG_ON(!old->allocated);
*new = *old;
list_replace(&old->node_list, &new->node_list);
rb_replace_node(&old->rb, &new->rb, &old->mm->interval_tree.rb_root);
rb_replace_node_cached(&old->rb, &new->rb, &mm->interval_tree);
if (drm_mm_hole_follows(old)) {
list_replace(&old->hole_stack, &new->hole_stack);
rb_replace_node(&old->rb_hole_size,
&new->rb_hole_size,
&old->mm->holes_size);
&mm->holes_size);
rb_replace_node(&old->rb_hole_addr,
&new->rb_hole_addr,
&old->mm->holes_addr);
&mm->holes_addr);
}
old->allocated = false;

1
fs/autofs4/waitq.c
View File

@ -170,7 +170,6 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
mutex_unlock(&sbi->wq_mutex);
if (autofs4_write(sbi, pipe, &pkt, pktsz))
switch (ret = autofs4_write(sbi, pipe, &pkt, pktsz)) {
case 0:
break;

7
fs/exec.c
View File

@ -1216,15 +1216,14 @@ killed:
return -EAGAIN;
}
char *get_task_comm(char *buf, struct task_struct *tsk)
char *__get_task_comm(char *buf, size_t buf_size, struct task_struct *tsk)
{
/* buf must be at least sizeof(tsk->comm) in size */
task_lock(tsk);
strncpy(buf, tsk->comm, sizeof(tsk->comm));
strncpy(buf, tsk->comm, buf_size);
task_unlock(tsk);
return buf;
}
EXPORT_SYMBOL_GPL(get_task_comm);
EXPORT_SYMBOL_GPL(__get_task_comm);
/*
* These functions flushes out all traces of the currently running executable

3
fs/nfsd/auth.c
View File

@ -60,6 +60,9 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
gi->gid[i] = exp->ex_anon_gid;
else
gi->gid[i] = rqgi->gid[i];
/* Each thread allocates its own gi, no race */
groups_sort(gi);
}
} else {
gi = get_group_info(rqgi);

1
include/linux/cred.h
View File

@ -83,6 +83,7 @@ extern int set_current_groups(struct group_info *);
extern void set_groups(struct cred *, struct group_info *);
extern int groups_search(const struct group_info *, kgid_t);
extern bool may_setgroups(void);
extern void groups_sort(struct group_info *);
/*
* The security context of a task

1
include/linux/idr.h
View File

@ -15,6 +15,7 @@
#include <linux/radix-tree.h>
#include <linux/gfp.h>
#include <linux/percpu.h>
#include <linux/bug.h>
struct idr {
struct radix_tree_root idr_rt;

9
include/linux/oom.h
View File

@ -66,6 +66,15 @@ static inline bool tsk_is_oom_victim(struct task_struct * tsk)
return tsk->signal->oom_mm;
}
/*
* Use this helper if tsk->mm != mm and the victim mm needs a special
* handling. This is guaranteed to stay true after once set.
*/
static inline bool mm_is_oom_victim(struct mm_struct *mm)
{
return test_bit(MMF_OOM_VICTIM, &mm->flags);
}
/*
* Checks whether a page fault on the given mm is still reliable.
* This is no longer true if the oom reaper started to reap the

2
include/linux/rbtree.h
View File

@ -99,6 +99,8 @@ extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
struct rb_root *root);
extern void rb_replace_node_rcu(struct rb_node *victim, struct rb_node *new,
struct rb_root *root);
extern void rb_replace_node_cached(struct rb_node *victim, struct rb_node *new,
struct rb_root_cached *root);
static inline void rb_link_node(struct rb_node *node, struct rb_node *parent,
struct rb_node **rb_link)

6
include/linux/sched.h
View File

@ -1503,7 +1503,11 @@ static inline void set_task_comm(struct task_struct *tsk, const char *from)
__set_task_comm(tsk, from, false);
}
extern char *get_task_comm(char *to, struct task_struct *tsk);
extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk);
#define get_task_comm(buf, tsk) ({ \
BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \
__get_task_comm(buf, sizeof(buf), tsk); \
})
#ifdef CONFIG_SMP
void scheduler_ipi(void);

1
include/linux/sched/coredump.h
View File

@ -70,6 +70,7 @@ static inline int get_dumpable(struct mm_struct *mm)
#define MMF_UNSTABLE 22 /* mm is unstable for copy_from_user */
#define MMF_HUGE_ZERO_PAGE 23 /* mm has ever used the global huge zero page */
#define MMF_DISABLE_THP 24 /* disable THP for all VMAs */
#define MMF_OOM_VICTIM 25 /* mm is the oom victim */
#define MMF_DISABLE_THP_MASK (1 << MMF_DISABLE_THP)
#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\

5
include/linux/string.h
View File

@ -259,7 +259,10 @@ __FORTIFY_INLINE __kernel_size_t strlen(const char *p)
{
__kernel_size_t ret;
size_t p_size = __builtin_object_size(p, 0);
if (p_size == (size_t)-1)
/* Work around gcc excess stack consumption issue */
if (p_size == (size_t)-1 ||
(__builtin_constant_p(p[p_size - 1]) && p[p_size - 1] == '\0'))
return __builtin_strlen(p);
ret = strnlen(p, p_size);
if (p_size <= ret)

8
kernel/exit.c
View File

@ -1755,3 +1755,11 @@ Efault:
return -EFAULT;
}
#endif
__weak void abort(void)
{
BUG();
/* if that doesn't kill us, halt */
panic("Oops failed to kill thread");
}

5
kernel/groups.c
View File

@ -86,11 +86,12 @@ static int gid_cmp(const void *_a, const void *_b)
return gid_gt(a, b) - gid_lt(a, b);
}
static void groups_sort(struct group_info *group_info)
void groups_sort(struct group_info *group_info)
{
sort(group_info->gid, group_info->ngroups, sizeof(*group_info->gid),
gid_cmp, NULL);
}
EXPORT_SYMBOL(groups_sort);
/* a simple bsearch */
int groups_search(const struct group_info *group_info, kgid_t grp)
@ -122,7 +123,6 @@ int groups_search(const struct group_info *group_info, kgid_t grp)
void set_groups(struct cred *new, struct group_info *group_info)
{
put_group_info(new->group_info);
groups_sort(group_info);
get_group_info(group_info);
new->group_info = group_info;
}
@ -206,6 +206,7 @@ SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)
return retval;
}
groups_sort(group_info);
retval = set_current_groups(group_info);
put_group_info(group_info);

4
kernel/kcov.c
View File

@ -157,7 +157,7 @@ void notrace __sanitizer_cov_trace_cmp2(u16 arg1, u16 arg2)
}
EXPORT_SYMBOL(__sanitizer_cov_trace_cmp2);
void notrace __sanitizer_cov_trace_cmp4(u16 arg1, u16 arg2)
void notrace __sanitizer_cov_trace_cmp4(u32 arg1, u32 arg2)
{
write_comp_data(KCOV_CMP_SIZE(2), arg1, arg2, _RET_IP_);
}
@ -183,7 +183,7 @@ void notrace __sanitizer_cov_trace_const_cmp2(u16 arg1, u16 arg2)
}
EXPORT_SYMBOL(__sanitizer_cov_trace_const_cmp2);
void notrace __sanitizer_cov_trace_const_cmp4(u16 arg1, u16 arg2)
void notrace __sanitizer_cov_trace_const_cmp4(u32 arg1, u32 arg2)
{
write_comp_data(KCOV_CMP_SIZE(2) | KCOV_CMP_CONST, arg1, arg2,
_RET_IP_);

1
kernel/uid16.c
View File

@ -192,6 +192,7 @@ SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
return retval;
}
groups_sort(group_info);
retval = set_current_groups(group_info);
put_group_info(group_info);

10
lib/rbtree.c
View File

@ -603,6 +603,16 @@ void rb_replace_node(struct rb_node *victim, struct rb_node *new,
}
EXPORT_SYMBOL(rb_replace_node);
void rb_replace_node_cached(struct rb_node *victim, struct rb_node *new,
struct rb_root_cached *root)
{
rb_replace_node(victim, new, &root->rb_root);
if (root->rb_leftmost == victim)
root->rb_leftmost = new;
}
EXPORT_SYMBOL(rb_replace_node_cached);
void rb_replace_node_rcu(struct rb_node *victim, struct rb_node *new,
struct rb_root *root)
{

6
mm/frame_vector.c
View File

@ -62,8 +62,10 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
* get_user_pages_longterm() and disallow it for filesystem-dax
* mappings.
*/
if (vma_is_fsdax(vma))
return -EOPNOTSUPP;
if (vma_is_fsdax(vma)) {
ret = -EOPNOTSUPP;
goto out;
}
if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) {
vec->got_ref = true;

2
mm/kmemleak.c
View File

@ -1523,7 +1523,7 @@ static void kmemleak_scan(void)
if (page_count(page) == 0)
continue;
scan_block(page, page + 1, NULL);
if (!(pfn % (MAX_SCAN_SIZE / sizeof(*page))))
if (!(pfn & 63))
cond_resched();
}
}

3
mm/memory.c
View File

@ -3831,7 +3831,8 @@ static inline int create_huge_pmd(struct vm_fault *vmf)
return VM_FAULT_FALLBACK;
}
static int wp_huge_pmd(struct vm_fault *vmf, pmd_t orig_pmd)
/* `inline' is required to avoid gcc 4.1.2 build error */
static inline int wp_huge_pmd(struct vm_fault *vmf, pmd_t orig_pmd)
{
if (vma_is_anonymous(vmf->vma))
return do_huge_pmd_wp_page(vmf, orig_pmd);

10
mm/mmap.c
View File

@ -3019,20 +3019,20 @@ void exit_mmap(struct mm_struct *mm)
/* Use -1 here to ensure all VMAs in the mm are unmapped */
unmap_vmas(&tlb, vma, 0, -1);
set_bit(MMF_OOM_SKIP, &mm->flags);
if (unlikely(tsk_is_oom_victim(current))) {
if (unlikely(mm_is_oom_victim(mm))) {
/*
* Wait for oom_reap_task() to stop working on this
* mm. Because MMF_OOM_SKIP is already set before
* calling down_read(), oom_reap_task() will not run
* on this "mm" post up_write().
*
* tsk_is_oom_victim() cannot be set from under us
* either because current->mm is already set to NULL
* mm_is_oom_victim() cannot be set from under us
* either because victim->mm is already set to NULL
* under task_lock before calling mmput and oom_mm is
* set not NULL by the OOM killer only if current->mm
* set not NULL by the OOM killer only if victim->mm
* is found not NULL while holding the task_lock.
*/
set_bit(MMF_OOM_SKIP, &mm->flags);
down_write(&mm->mmap_sem);
up_write(&mm->mmap_sem);
}

4
mm/oom_kill.c
View File

@ -683,8 +683,10 @@ static void mark_oom_victim(struct task_struct *tsk)
return;
/* oom_mm is bound to the signal struct life time. */
if (!cmpxchg(&tsk->signal->oom_mm, NULL, mm))
if (!cmpxchg(&tsk->signal->oom_mm, NULL, mm)) {
mmgrab(tsk->signal->oom_mm);
set_bit(MMF_OOM_VICTIM, &mm->flags);
}
/*
* Make sure that the task is woken up from uninterruptible sleep

11
mm/page_alloc.c
View File

@ -2684,6 +2684,7 @@ void free_unref_page_list(struct list_head *list)
{
struct page *page, *next;
unsigned long flags, pfn;
int batch_count = 0;
/* Prepare pages for freeing */
list_for_each_entry_safe(page, next, list, lru) {
@ -2700,6 +2701,16 @@ void free_unref_page_list(struct list_head *list)
set_page_private(page, 0);
trace_mm_page_free_batched(page);
free_unref_page_commit(page, pfn);
/*
* Guard against excessive IRQ disabled times when we get
* a large list of pages to free.
*/
if (++batch_count == SWAP_CLUSTER_MAX) {
local_irq_restore(flags);
batch_count = 0;
local_irq_save(flags);
}
}
local_irq_restore(flags);
}

23
mm/slab.c
View File

@ -1584,11 +1584,8 @@ static void print_objinfo(struct kmem_cache *cachep, void *objp, int lines)
*dbg_redzone2(cachep, objp));
}
if (cachep->flags & SLAB_STORE_USER) {
pr_err("Last user: [<%p>](%pSR)\n",
*dbg_userword(cachep, objp),
*dbg_userword(cachep, objp));
}
if (cachep->flags & SLAB_STORE_USER)
pr_err("Last user: (%pSR)\n", *dbg_userword(cachep, objp));
realobj = (char *)objp + obj_offset(cachep);
size = cachep->object_size;
for (i = 0; i < size && lines; i += 16, lines--) {
@ -1621,7 +1618,7 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp)
/* Mismatch ! */
/* Print header */
if (lines == 0) {
pr_err("Slab corruption (%s): %s start=%p, len=%d\n",
pr_err("Slab corruption (%s): %s start=%px, len=%d\n",
print_tainted(), cachep->name,
realobj, size);
print_objinfo(cachep, objp, 0);
@ -1650,13 +1647,13 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp)
if (objnr) {
objp = index_to_obj(cachep, page, objnr - 1);
realobj = (char *)objp + obj_offset(cachep);
pr_err("Prev obj: start=%p, len=%d\n", realobj, size);
pr_err("Prev obj: start=%px, len=%d\n", realobj, size);
print_objinfo(cachep, objp, 2);
}
if (objnr + 1 < cachep->num) {
objp = index_to_obj(cachep, page, objnr + 1);
realobj = (char *)objp + obj_offset(cachep);
pr_err("Next obj: start=%p, len=%d\n", realobj, size);
pr_err("Next obj: start=%px, len=%d\n", realobj, size);
print_objinfo(cachep, objp, 2);
}
}
@ -2608,7 +2605,7 @@ static void slab_put_obj(struct kmem_cache *cachep,
/* Verify double free bug */
for (i = page->active; i < cachep->num; i++) {
if (get_free_obj(page, i) == objnr) {
pr_err("slab: double free detected in cache '%s', objp %p\n",
pr_err("slab: double free detected in cache '%s', objp %px\n",
cachep->name, objp);
BUG();
}
@ -2772,7 +2769,7 @@ static inline void verify_redzone_free(struct kmem_cache *cache, void *obj)
else
slab_error(cache, "memory outside object was overwritten");
pr_err("%p: redzone 1:0x%llx, redzone 2:0x%llx\n",
pr_err("%px: redzone 1:0x%llx, redzone 2:0x%llx\n",
obj, redzone1, redzone2);
}
@ -3078,7 +3075,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
if (*dbg_redzone1(cachep, objp) != RED_INACTIVE ||
*dbg_redzone2(cachep, objp) != RED_INACTIVE) {
slab_error(cachep, "double free, or memory outside object was overwritten");
pr_err("%p: redzone 1:0x%llx, redzone 2:0x%llx\n",
pr_err("%px: redzone 1:0x%llx, redzone 2:0x%llx\n",
objp, *dbg_redzone1(cachep, objp),
*dbg_redzone2(cachep, objp));
}
@ -3091,7 +3088,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
cachep->ctor(objp);
if (ARCH_SLAB_MINALIGN &&
((unsigned long)objp & (ARCH_SLAB_MINALIGN-1))) {
pr_err("0x%p: not aligned to ARCH_SLAB_MINALIGN=%d\n",
pr_err("0x%px: not aligned to ARCH_SLAB_MINALIGN=%d\n",
objp, (int)ARCH_SLAB_MINALIGN);
}
return objp;
@ -4283,7 +4280,7 @@ static void show_symbol(struct seq_file *m, unsigned long address)
return;
}
#endif
seq_printf(m, "%p", (void *)address);
seq_printf(m, "%px", (void *)address);
}
static int leaks_show(struct seq_file *m, void *p)

1
net/sunrpc/auth_gss/gss_rpc_xdr.c
View File

@ -231,6 +231,7 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
goto out_free_groups;
creds->cr_group_info->gid[i] = kgid;
}
groups_sort(creds->cr_group_info);
return 0;
out_free_groups:

1
net/sunrpc/auth_gss/svcauth_gss.c
View File

@ -481,6 +481,7 @@ static int rsc_parse(struct cache_detail *cd,
goto out;
rsci.cred.cr_group_info->gid[i] = kgid;
}
groups_sort(rsci.cred.cr_group_info);
/* mech name */
len = qword_get(&mesg, buf, mlen);

2
net/sunrpc/svcauth_unix.c
View File

@ -520,6 +520,7 @@ static int unix_gid_parse(struct cache_detail *cd,
ug.gi->gid[i] = kgid;
}
groups_sort(ug.gi);
ugp = unix_gid_lookup(cd, uid);
if (ugp) {
struct cache_head *ch;
@ -819,6 +820,7 @@ svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
cred->cr_group_info->gid[i] = kgid;
}
groups_sort(cred->cr_group_info);
if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
*authp = rpc_autherr_badverf;
return SVC_DENIED;

8
scripts/faddr2line
View File

@ -44,10 +44,10 @@
set -o errexit
set -o nounset
READELF="${CROSS_COMPILE}readelf"
ADDR2LINE="${CROSS_COMPILE}addr2line"
SIZE="${CROSS_COMPILE}size"
NM="${CROSS_COMPILE}nm"
READELF="${CROSS_COMPILE:-}readelf"
ADDR2LINE="${CROSS_COMPILE:-}addr2line"
SIZE="${CROSS_COMPILE:-}size"
NM="${CROSS_COMPILE:-}nm"
command -v awk >/dev/null 2>&1 || die "awk isn't installed"
command -v ${READELF} >/dev/null 2>&1 || die "readelf isn't installed"

2
tools/vm/slabinfo-gnuplot.sh
View File

@ -1,4 +1,4 @@
#!/bin/sh
#!/bin/bash
# Sergey Senozhatsky, 2015
# sergey.senozhatsky.work@gmail.com