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Merge branch 'akpm' (patches from Andrew)

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Merge misc fixes from Andrew Morton:
 "16 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  coredump: fix race condition between mmget_not_zero()/get_task_mm() and core dumping
  mm/kmemleak.c: fix unused-function warning
  init: initialize jump labels before command line option parsing
  kernel/watchdog_hld.c: hard lockup message should end with a newline
  kcov: improve CONFIG_ARCH_HAS_KCOV help text
  mm: fix inactive list balancing between NUMA nodes and cgroups
  mm/hotplug: treat CMA pages as unmovable
  proc: fixup proc-pid-vm test
  proc: fix map_files test on F29
  mm/vmstat.c: fix /proc/vmstat format for CONFIG_DEBUG_TLBFLUSH=y CONFIG_SMP=n
  mm/memory_hotplug: do not unlock after failing to take the device_hotplug_lock
  mm: swapoff: shmem_unuse() stop eviction without igrab()
  mm: swapoff: take notice of completion sooner
  mm: swapoff: remove too limiting SWAP_UNUSE_MAX_TRIES
  mm: swapoff: shmem_find_swap_entries() filter out other types
  slab: store tagged freelist for off-slab slabmgmt
This commit is contained in:
Linus Torvalds 2019-04-19 11:46:51 -07:00
commit 3ecafda911
19 changed files with 151 additions and 104 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/base/memory.c
View File

@ -506,7 +506,7 @@ static ssize_t probe_store(struct device *dev, struct device_attribute *attr,
ret = lock_device_hotplug_sysfs();
if (ret)
goto out;
return ret;
nid = memory_add_physaddr_to_nid(phys_addr);
ret = __add_memory(nid, phys_addr,

3
drivers/infiniband/core/uverbs_main.c
View File

@ -993,6 +993,8 @@ void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
* will only be one mm, so no big deal.
*/
down_write(&mm->mmap_sem);
if (!mmget_still_valid(mm))
goto skip_mm;
mutex_lock(&ufile->umap_lock);
list_for_each_entry_safe (priv, next_priv, &ufile->umaps,
list) {
@ -1007,6 +1009,7 @@ void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
vma->vm_flags &= ~(VM_SHARED | VM_MAYSHARE);
}
mutex_unlock(&ufile->umap_lock);
skip_mm:
up_write(&mm->mmap_sem);
mmput(mm);
}

18
fs/proc/task_mmu.c
View File

@ -1143,6 +1143,24 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
count = -EINTR;
goto out_mm;
}
/*
* Avoid to modify vma->vm_flags
* without locked ops while the
* coredump reads the vm_flags.
*/
if (!mmget_still_valid(mm)) {
/*
* Silently return "count"
* like if get_task_mm()
* failed. FIXME: should this
* function have returned
* -ESRCH if get_task_mm()
* failed like if
* get_proc_task() fails?
*/
up_write(&mm->mmap_sem);
goto out_mm;
}
for (vma = mm->mmap; vma; vma = vma->vm_next) {
vma->vm_flags &= ~VM_SOFTDIRTY;
vma_set_page_prot(vma);

9
fs/userfaultfd.c
View File

@ -629,6 +629,8 @@ static void userfaultfd_event_wait_completion(struct userfaultfd_ctx *ctx,
/* the various vma->vm_userfaultfd_ctx still points to it */
down_write(&mm->mmap_sem);
/* no task can run (and in turn coredump) yet */
VM_WARN_ON(!mmget_still_valid(mm));
for (vma = mm->mmap; vma; vma = vma->vm_next)
if (vma->vm_userfaultfd_ctx.ctx == release_new_ctx) {
vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
@ -883,6 +885,8 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
* taking the mmap_sem for writing.
*/
down_write(&mm->mmap_sem);
if (!mmget_still_valid(mm))
goto skip_mm;
prev = NULL;
for (vma = mm->mmap; vma; vma = vma->vm_next) {
cond_resched();
@ -905,6 +909,7 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
vma->vm_flags = new_flags;
vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
}
skip_mm:
up_write(&mm->mmap_sem);
mmput(mm);
wakeup:
@ -1333,6 +1338,8 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
goto out;
down_write(&mm->mmap_sem);
if (!mmget_still_valid(mm))
goto out_unlock;
vma = find_vma_prev(mm, start, &prev);
if (!vma)
goto out_unlock;
@ -1520,6 +1527,8 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
goto out;
down_write(&mm->mmap_sem);
if (!mmget_still_valid(mm))
goto out_unlock;
vma = find_vma_prev(mm, start, &prev);
if (!vma)
goto out_unlock;

21
include/linux/sched/mm.h
View File

@ -49,6 +49,27 @@ static inline void mmdrop(struct mm_struct *mm)
__mmdrop(mm);
}
/*
* This has to be called after a get_task_mm()/mmget_not_zero()
* followed by taking the mmap_sem for writing before modifying the
* vmas or anything the coredump pretends not to change from under it.
*
* NOTE: find_extend_vma() called from GUP context is the only place
* that can modify the "mm" (notably the vm_start/end) under mmap_sem
* for reading and outside the context of the process, so it is also
* the only case that holds the mmap_sem for reading that must call
* this function. Generally if the mmap_sem is hold for reading
* there's no need of this check after get_task_mm()/mmget_not_zero().
*
* This function can be obsoleted and the check can be removed, after
* the coredump code will hold the mmap_sem for writing before
* invoking the ->core_dump methods.
*/
static inline bool mmget_still_valid(struct mm_struct *mm)
{
return likely(!mm->core_state);
}
/**
* mmget() - Pin the address space associated with a &struct mm_struct.
* @mm: The address space to pin.

1
include/linux/shmem_fs.h
View File

@ -21,6 +21,7 @@ struct shmem_inode_info {
struct list_head swaplist; /* chain of maybes on swap */
struct shared_policy policy; /* NUMA memory alloc policy */
struct simple_xattrs xattrs; /* list of xattrs */
atomic_t stop_eviction; /* hold when working on inode */
struct inode vfs_inode;
};

4
init/main.c
View File

@ -582,6 +582,8 @@ asmlinkage __visible void __init start_kernel(void)
page_alloc_init();
pr_notice("Kernel command line: %s\n", boot_command_line);
/* parameters may set static keys */
jump_label_init();
parse_early_param();
after_dashes = parse_args("Booting kernel",
static_command_line, __start___param,
@ -591,8 +593,6 @@ asmlinkage __visible void __init start_kernel(void)
parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
NULL, set_init_arg);
jump_label_init();
/*
* These use large bootmem allocations and must precede
* kmem_cache_init()

3
kernel/watchdog_hld.c
View File

@ -135,7 +135,8 @@ static void watchdog_overflow_callback(struct perf_event *event,
if (__this_cpu_read(hard_watchdog_warn) == true)
return;
pr_emerg("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
pr_emerg("Watchdog detected hard LOCKUP on cpu %d\n",
this_cpu);
print_modules();
print_irqtrace_events(current);
if (regs)

6
lib/Kconfig.debug
View File

@ -753,9 +753,9 @@ endmenu # "Memory Debugging"
config ARCH_HAS_KCOV
bool
help
KCOV does not have any arch-specific code, but currently it is enabled
only for x86_64. KCOV requires testing on other archs, and most likely
disabling of instrumentation for some early boot code.
An architecture should select this when it can successfully
build and run with CONFIG_KCOV. This typically requires
disabling instrumentation for some early boot code.
config CC_HAS_SANCOV_TRACE_PC
def_bool $(cc-option,-fsanitize-coverage=trace-pc)

2
mm/kmemleak.c
View File

@ -1401,6 +1401,7 @@ static void scan_block(void *_start, void *_end,
/*
* Scan a large memory block in MAX_SCAN_SIZE chunks to reduce the latency.
*/
#ifdef CONFIG_SMP
static void scan_large_block(void *start, void *end)
{
void *next;
@ -1412,6 +1413,7 @@ static void scan_large_block(void *start, void *end)
cond_resched();
}
}
#endif
/*
* Scan a memory block corresponding to a kmemleak_object. A condition is

7
mm/mmap.c
View File

@ -45,6 +45,7 @@
#include <linux/moduleparam.h>
#include <linux/pkeys.h>
#include <linux/oom.h>
#include <linux/sched/mm.h>
#include <linux/uaccess.h>
#include <asm/cacheflush.h>
@ -2525,7 +2526,8 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
vma = find_vma_prev(mm, addr, &prev);
if (vma && (vma->vm_start <= addr))
return vma;
if (!prev || expand_stack(prev, addr))
/* don't alter vm_end if the coredump is running */
if (!prev || !mmget_still_valid(mm) || expand_stack(prev, addr))
return NULL;
if (prev->vm_flags & VM_LOCKED)
populate_vma_page_range(prev, addr, prev->vm_end, NULL);
@ -2551,6 +2553,9 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
return vma;
if (!(vma->vm_flags & VM_GROWSDOWN))
return NULL;
/* don't alter vm_start if the coredump is running */
if (!mmget_still_valid(mm))
return NULL;
start = vma->vm_start;
if (expand_stack(vma, addr))
return NULL;

30
mm/page_alloc.c
View File

@ -8005,7 +8005,10 @@ void *__init alloc_large_system_hash(const char *tablename,
bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
int migratetype, int flags)
{
unsigned long pfn, iter, found;
unsigned long found;
unsigned long iter = 0;
unsigned long pfn = page_to_pfn(page);
const char *reason = "unmovable page";
/*
* TODO we could make this much more efficient by not checking every
@ -8015,17 +8018,20 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
* can still lead to having bootmem allocations in zone_movable.
*/
/*
* CMA allocations (alloc_contig_range) really need to mark isolate
* CMA pageblocks even when they are not movable in fact so consider
* them movable here.
*/
if (is_migrate_cma(migratetype) &&
is_migrate_cma(get_pageblock_migratetype(page)))
return false;
if (is_migrate_cma_page(page)) {
/*
* CMA allocations (alloc_contig_range) really need to mark
* isolate CMA pageblocks even when they are not movable in fact
* so consider them movable here.
*/
if (is_migrate_cma(migratetype))
return false;
pfn = page_to_pfn(page);
for (found = 0, iter = 0; iter < pageblock_nr_pages; iter++) {
reason = "CMA page";
goto unmovable;
}
for (found = 0; iter < pageblock_nr_pages; iter++) {
unsigned long check = pfn + iter;
if (!pfn_valid_within(check))
@ -8105,7 +8111,7 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
unmovable:
WARN_ON_ONCE(zone_idx(zone) == ZONE_MOVABLE);
if (flags & REPORT_FAILURE)
dump_page(pfn_to_page(pfn+iter), "unmovable page");
dump_page(pfn_to_page(pfn + iter), reason);
return true;
}

58
mm/shmem.c
View File

@ -1081,9 +1081,14 @@ static void shmem_evict_inode(struct inode *inode)
}
spin_unlock(&sbinfo->shrinklist_lock);
}
if (!list_empty(&info->swaplist)) {
while (!list_empty(&info->swaplist)) {
/* Wait while shmem_unuse() is scanning this inode... */
wait_var_event(&info->stop_eviction,
!atomic_read(&info->stop_eviction));
mutex_lock(&shmem_swaplist_mutex);
list_del_init(&info->swaplist);
/* ...but beware of the race if we peeked too early */
if (!atomic_read(&info->stop_eviction))
list_del_init(&info->swaplist);
mutex_unlock(&shmem_swaplist_mutex);
}
}
@ -1099,10 +1104,11 @@ extern struct swap_info_struct *swap_info[];
static int shmem_find_swap_entries(struct address_space *mapping,
pgoff_t start, unsigned int nr_entries,
struct page **entries, pgoff_t *indices,
bool frontswap)
unsigned int type, bool frontswap)
{
XA_STATE(xas, &mapping->i_pages, start);
struct page *page;
swp_entry_t entry;
unsigned int ret = 0;
if (!nr_entries)
@ -1116,13 +1122,12 @@ static int shmem_find_swap_entries(struct address_space *mapping,
if (!xa_is_value(page))
continue;
if (frontswap) {
swp_entry_t entry = radix_to_swp_entry(page);
if (!frontswap_test(swap_info[swp_type(entry)],
swp_offset(entry)))
continue;
}
entry = radix_to_swp_entry(page);
if (swp_type(entry) != type)
continue;
if (frontswap &&
!frontswap_test(swap_info[type], swp_offset(entry)))
continue;
indices[ret] = xas.xa_index;
entries[ret] = page;
@ -1194,7 +1199,7 @@ static int shmem_unuse_inode(struct inode *inode, unsigned int type,
pvec.nr = shmem_find_swap_entries(mapping, start, nr_entries,
pvec.pages, indices,
frontswap);
type, frontswap);
if (pvec.nr == 0) {
ret = 0;
break;
@ -1227,36 +1232,27 @@ int shmem_unuse(unsigned int type, bool frontswap,
unsigned long *fs_pages_to_unuse)
{
struct shmem_inode_info *info, *next;
struct inode *inode;
struct inode *prev_inode = NULL;
int error = 0;
if (list_empty(&shmem_swaplist))
return 0;
mutex_lock(&shmem_swaplist_mutex);
/*
* The extra refcount on the inode is necessary to safely dereference
* p->next after re-acquiring the lock. New shmem inodes with swap
* get added to the end of the list and we will scan them all.
*/
list_for_each_entry_safe(info, next, &shmem_swaplist, swaplist) {
if (!info->swapped) {
list_del_init(&info->swaplist);
continue;
}
inode = igrab(&info->vfs_inode);
if (!inode)
continue;
/*
* Drop the swaplist mutex while searching the inode for swap;
* but before doing so, make sure shmem_evict_inode() will not
* remove placeholder inode from swaplist, nor let it be freed
* (igrab() would protect from unlink, but not from unmount).
*/
atomic_inc(&info->stop_eviction);
mutex_unlock(&shmem_swaplist_mutex);
if (prev_inode)
iput(prev_inode);
prev_inode = inode;
error = shmem_unuse_inode(inode, type, frontswap,
error = shmem_unuse_inode(&info->vfs_inode, type, frontswap,
fs_pages_to_unuse);
cond_resched();
@ -1264,14 +1260,13 @@ int shmem_unuse(unsigned int type, bool frontswap,
next = list_next_entry(info, swaplist);
if (!info->swapped)
list_del_init(&info->swaplist);
if (atomic_dec_and_test(&info->stop_eviction))
wake_up_var(&info->stop_eviction);
if (error)
break;
}
mutex_unlock(&shmem_swaplist_mutex);
if (prev_inode)
iput(prev_inode);
return error;
}
@ -2238,6 +2233,7 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
info = SHMEM_I(inode);
memset(info, 0, (char *)inode - (char *)info);
spin_lock_init(&info->lock);
atomic_set(&info->stop_eviction, 0);
info->seals = F_SEAL_SEAL;
info->flags = flags & VM_NORESERVE;
INIT_LIST_HEAD(&info->shrinklist);

1
mm/slab.c
View File

@ -2374,7 +2374,6 @@ static void *alloc_slabmgmt(struct kmem_cache *cachep,
/* Slab management obj is off-slab. */
freelist = kmem_cache_alloc_node(cachep->freelist_cache,
local_flags, nodeid);
freelist = kasan_reset_tag(freelist);
if (!freelist)
return NULL;
} else {

32
mm/swapfile.c
View File

@ -2023,7 +2023,6 @@ static unsigned int find_next_to_unuse(struct swap_info_struct *si,
* If the boolean frontswap is true, only unuse pages_to_unuse pages;
* pages_to_unuse==0 means all pages; ignored if frontswap is false
*/
#define SWAP_UNUSE_MAX_TRIES 3
int try_to_unuse(unsigned int type, bool frontswap,
unsigned long pages_to_unuse)
{
@ -2035,7 +2034,6 @@ int try_to_unuse(unsigned int type, bool frontswap,
struct page *page;
swp_entry_t entry;
unsigned int i;
int retries = 0;
if (!si->inuse_pages)
return 0;
@ -2053,11 +2051,9 @@ retry:
spin_lock(&mmlist_lock);
p = &init_mm.mmlist;
while ((p = p->next) != &init_mm.mmlist) {
if (signal_pending(current)) {
retval = -EINTR;
break;
}
while (si->inuse_pages &&
!signal_pending(current) &&
(p = p->next) != &init_mm.mmlist) {
mm = list_entry(p, struct mm_struct, mmlist);
if (!mmget_not_zero(mm))
@ -2084,7 +2080,9 @@ retry:
mmput(prev_mm);
i = 0;
while ((i = find_next_to_unuse(si, i, frontswap)) != 0) {
while (si->inuse_pages &&
!signal_pending(current) &&
(i = find_next_to_unuse(si, i, frontswap)) != 0) {
entry = swp_entry(type, i);
page = find_get_page(swap_address_space(entry), i);
@ -2117,14 +2115,18 @@ retry:
* If yes, we would need to do retry the unuse logic again.
* Under global memory pressure, swap entries can be reinserted back
* into process space after the mmlist loop above passes over them.
* Its not worth continuosuly retrying to unuse the swap in this case.
* So we try SWAP_UNUSE_MAX_TRIES times.
*
* Limit the number of retries? No: when mmget_not_zero() above fails,
* that mm is likely to be freeing swap from exit_mmap(), which proceeds
* at its own independent pace; and even shmem_writepage() could have
* been preempted after get_swap_page(), temporarily hiding that swap.
* It's easy and robust (though cpu-intensive) just to keep retrying.
*/
if (++retries >= SWAP_UNUSE_MAX_TRIES)
retval = -EBUSY;
else if (si->inuse_pages)
goto retry;
if (si->inuse_pages) {
if (!signal_pending(current))
goto retry;
retval = -EINTR;
}
out:
return (retval == FRONTSWAP_PAGES_UNUSED) ? 0 : retval;
}

29
mm/vmscan.c
View File

@ -2176,7 +2176,6 @@ static void shrink_active_list(unsigned long nr_to_scan,
* 10TB 320 32GB
*/
static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
struct mem_cgroup *memcg,
struct scan_control *sc, bool actual_reclaim)
{
enum lru_list active_lru = file * LRU_FILE + LRU_ACTIVE;
@ -2197,16 +2196,12 @@ static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
inactive = lruvec_lru_size(lruvec, inactive_lru, sc->reclaim_idx);
active = lruvec_lru_size(lruvec, active_lru, sc->reclaim_idx);
if (memcg)
refaults = memcg_page_state(memcg, WORKINGSET_ACTIVATE);
else
refaults = node_page_state(pgdat, WORKINGSET_ACTIVATE);
/*
* When refaults are being observed, it means a new workingset
* is being established. Disable active list protection to get
* rid of the stale workingset quickly.
*/
refaults = lruvec_page_state(lruvec, WORKINGSET_ACTIVATE);
if (file && actual_reclaim && lruvec->refaults != refaults) {
inactive_ratio = 0;
} else {
@ -2227,12 +2222,10 @@ static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
}
static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
struct lruvec *lruvec, struct mem_cgroup *memcg,
struct scan_control *sc)
struct lruvec *lruvec, struct scan_control *sc)
{
if (is_active_lru(lru)) {
if (inactive_list_is_low(lruvec, is_file_lru(lru),
memcg, sc, true))
if (inactive_list_is_low(lruvec, is_file_lru(lru), sc, true))
shrink_active_list(nr_to_scan, lruvec, sc, lru);
return 0;
}
@ -2332,7 +2325,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
* anonymous pages on the LRU in eligible zones.
* Otherwise, the small LRU gets thrashed.
*/
if (!inactive_list_is_low(lruvec, false, memcg, sc, false) &&
if (!inactive_list_is_low(lruvec, false, sc, false) &&
lruvec_lru_size(lruvec, LRU_INACTIVE_ANON, sc->reclaim_idx)
>> sc->priority) {
scan_balance = SCAN_ANON;
@ -2350,7 +2343,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
* lruvec even if it has plenty of old anonymous pages unless the
* system is under heavy pressure.
*/
if (!inactive_list_is_low(lruvec, true, memcg, sc, false) &&
if (!inactive_list_is_low(lruvec, true, sc, false) &&
lruvec_lru_size(lruvec, LRU_INACTIVE_FILE, sc->reclaim_idx) >> sc->priority) {
scan_balance = SCAN_FILE;
goto out;
@ -2503,7 +2496,7 @@ static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc
nr[lru] -= nr_to_scan;
nr_reclaimed += shrink_list(lru, nr_to_scan,
lruvec, memcg, sc);
lruvec, sc);
}
}
@ -2570,7 +2563,7 @@ static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc
* Even if we did not try to evict anon pages at all, we want to
* rebalance the anon lru active/inactive ratio.
*/
if (inactive_list_is_low(lruvec, false, memcg, sc, true))
if (inactive_list_is_low(lruvec, false, sc, true))
shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
sc, LRU_ACTIVE_ANON);
}
@ -2969,12 +2962,8 @@ static void snapshot_refaults(struct mem_cgroup *root_memcg, pg_data_t *pgdat)
unsigned long refaults;
struct lruvec *lruvec;
if (memcg)
refaults = memcg_page_state(memcg, WORKINGSET_ACTIVATE);
else
refaults = node_page_state(pgdat, WORKINGSET_ACTIVATE);
lruvec = mem_cgroup_lruvec(pgdat, memcg);
refaults = lruvec_page_state(lruvec, WORKINGSET_ACTIVATE);
lruvec->refaults = refaults;
} while ((memcg = mem_cgroup_iter(root_memcg, memcg, NULL)));
}
@ -3339,7 +3328,7 @@ static void age_active_anon(struct pglist_data *pgdat,
do {
struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, memcg);
if (inactive_list_is_low(lruvec, false, memcg, sc, true))
if (inactive_list_is_low(lruvec, false, sc, true))
shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
sc, LRU_ACTIVE_ANON);

5
mm/vmstat.c
View File

@ -1274,13 +1274,8 @@ const char * const vmstat_text[] = {
#endif
#endif /* CONFIG_MEMORY_BALLOON */
#ifdef CONFIG_DEBUG_TLBFLUSH
#ifdef CONFIG_SMP
"nr_tlb_remote_flush",
"nr_tlb_remote_flush_received",
#else
"", /* nr_tlb_remote_flush */
"", /* nr_tlb_remote_flush_received */
#endif /* CONFIG_SMP */
"nr_tlb_local_flush_all",
"nr_tlb_local_flush_one",
#endif /* CONFIG_DEBUG_TLBFLUSH */

4
tools/testing/selftests/proc/proc-pid-vm.c
View File

@ -187,8 +187,8 @@ static int make_exe(const uint8_t *payload, size_t len)
ph.p_offset = 0;
ph.p_vaddr = VADDR;
ph.p_paddr = 0;
ph.p_filesz = sizeof(struct elf64_hdr) + sizeof(struct elf64_phdr) + sizeof(payload);
ph.p_memsz = sizeof(struct elf64_hdr) + sizeof(struct elf64_phdr) + sizeof(payload);
ph.p_filesz = sizeof(struct elf64_hdr) + sizeof(struct elf64_phdr) + len;
ph.p_memsz = sizeof(struct elf64_hdr) + sizeof(struct elf64_phdr) + len;
ph.p_align = 4096;
fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_EXCL|O_TMPFILE, 0700);

20
tools/testing/selftests/proc/proc-self-map-files-002.c
View File

@ -46,12 +46,9 @@ static void fail(const char *fmt, unsigned long a, unsigned long b)
int main(void)
{
const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
#ifdef __arm__
unsigned long va = 2 * PAGE_SIZE;
#else
unsigned long va = 0;
#endif
const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
const unsigned long va_max = 1UL << 32;
unsigned long va;
void *p;
int fd;
unsigned long a, b;
@ -60,10 +57,13 @@ int main(void)
if (fd == -1)
return 1;
p = mmap((void *)va, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE|MAP_FIXED, fd, 0);
if (p == MAP_FAILED) {
if (errno == EPERM)
return 4;
for (va = 0; va < va_max; va += PAGE_SIZE) {
p = mmap((void *)va, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE|MAP_FIXED, fd, 0);
if (p == (void *)va)
break;
}
if (va == va_max) {
fprintf(stderr, "error: mmap doesn't like you\n");
return 1;
}