aboutsummaryrefslogtreecommitdiff
path: root/lib
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2016-07-28 16:36:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-28 16:36:48 -0700
commit1c88e19b0f6a8471ee50d5062721ba30b8fd4ba9 (patch)
tree6d227487ca2cf391589c73af1c40ec7b7126feec /lib
parent6039b80eb50a893476fea7d56e86ed2d19290054 (diff)
parentc3486f5376696034d0fcbef8ba70c70cfcb26f51 (diff)
downloadlinux-stericsson-1c88e19b0f6a8471ee50d5062721ba30b8fd4ba9.tar.gz
Merge branch 'akpm' (patches from Andrew)
Merge more updates from Andrew Morton: "The rest of MM" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (101 commits) mm, compaction: simplify contended compaction handling mm, compaction: introduce direct compaction priority mm, thp: remove __GFP_NORETRY from khugepaged and madvised allocations mm, page_alloc: make THP-specific decisions more generic mm, page_alloc: restructure direct compaction handling in slowpath mm, page_alloc: don't retry initial attempt in slowpath mm, page_alloc: set alloc_flags only once in slowpath lib/stackdepot.c: use __GFP_NOWARN for stack allocations mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB mm, kasan: account for object redzone in SLUB's nearest_obj() mm: fix use-after-free if memory allocation failed in vma_adjust() zsmalloc: Delete an unnecessary check before the function call "iput" mm/memblock.c: fix index adjustment error in __next_mem_range_rev() mem-hotplug: alloc new page from a nearest neighbor node when mem-offline mm: optimize copy_page_to/from_iter_iovec mm: add cond_resched() to generic_swapfile_activate() Revert "mm, mempool: only set __GFP_NOMEMALLOC if there are free elements" mm, compaction: don't isolate PageWriteback pages in MIGRATE_SYNC_LIGHT mode mm: hwpoison: remove incorrect comments make __section_nr() more efficient ...
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.kasan4
-rw-r--r--lib/iov_iter.c8
-rw-r--r--lib/stackdepot.c1
3 files changed, 9 insertions, 4 deletions
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index 67d8c6838ba9..bd38aab05929 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -5,9 +5,9 @@ if HAVE_ARCH_KASAN
config KASAN
bool "KASan: runtime memory debugger"
- depends on SLUB_DEBUG || (SLAB && !DEBUG_SLAB)
+ depends on SLUB || (SLAB && !DEBUG_SLAB)
select CONSTRUCTORS
- select STACKDEPOT if SLAB
+ select STACKDEPOT
help
Enables kernel address sanitizer - runtime memory debugger,
designed to find out-of-bounds accesses and use-after-free bugs.
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index d67c8288d95d..9e8c7386b3a0 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -144,7 +144,7 @@ static size_t copy_page_to_iter_iovec(struct page *page, size_t offset, size_t b
buf = iov->iov_base + skip;
copy = min(bytes, iov->iov_len - skip);
- if (!fault_in_pages_writeable(buf, copy)) {
+ if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_pages_writeable(buf, copy)) {
kaddr = kmap_atomic(page);
from = kaddr + offset;
@@ -175,6 +175,7 @@ static size_t copy_page_to_iter_iovec(struct page *page, size_t offset, size_t b
copy = min(bytes, iov->iov_len - skip);
}
/* Too bad - revert to non-atomic kmap */
+
kaddr = kmap(page);
from = kaddr + offset;
left = __copy_to_user(buf, from, copy);
@@ -193,6 +194,7 @@ static size_t copy_page_to_iter_iovec(struct page *page, size_t offset, size_t b
bytes -= copy;
}
kunmap(page);
+
done:
if (skip == iov->iov_len) {
iov++;
@@ -225,7 +227,7 @@ static size_t copy_page_from_iter_iovec(struct page *page, size_t offset, size_t
buf = iov->iov_base + skip;
copy = min(bytes, iov->iov_len - skip);
- if (!fault_in_pages_readable(buf, copy)) {
+ if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_pages_readable(buf, copy)) {
kaddr = kmap_atomic(page);
to = kaddr + offset;
@@ -256,6 +258,7 @@ static size_t copy_page_from_iter_iovec(struct page *page, size_t offset, size_t
copy = min(bytes, iov->iov_len - skip);
}
/* Too bad - revert to non-atomic kmap */
+
kaddr = kmap(page);
to = kaddr + offset;
left = __copy_from_user(to, buf, copy);
@@ -274,6 +277,7 @@ static size_t copy_page_from_iter_iovec(struct page *page, size_t offset, size_t
bytes -= copy;
}
kunmap(page);
+
done:
if (skip == iov->iov_len) {
iov++;
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 53ad6c0831ae..60f77f1d470a 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -242,6 +242,7 @@ depot_stack_handle_t depot_save_stack(struct stack_trace *trace,
*/
alloc_flags &= ~GFP_ZONEMASK;
alloc_flags &= (GFP_ATOMIC | GFP_KERNEL);
+ alloc_flags |= __GFP_NOWARN;
page = alloc_pages(alloc_flags, STACK_ALLOC_ORDER);
if (page)
prealloc = page_address(page);