Merge 4.9.96 into android-4.9

Changes in 4.9.96
	tty: make n_tty_read() always abort if hangup is in progress
	ubifs: Check ubifs_wbuf_sync() return code
	ubi: fastmap: Don't flush fastmap work on detach
	ubi: Fix error for write access
	ubi: Reject MLC NAND
	fs/reiserfs/journal.c: add missing resierfs_warning() arg
	resource: fix integer overflow at reallocation
	ipc/shm: fix use-after-free of shm file via remap_file_pages()
	mm, slab: reschedule cache_reap() on the same CPU
	usb: musb: gadget: misplaced out of bounds check
	usb: gadget: udc: core: update usb_ep_queue() documentation
	ARM: dts: at91: at91sam9g25: fix mux-mask pinctrl property
	ARM: dts: exynos: Fix IOMMU support for GScaler devices on Exynos5250
	ARM: dts: at91: sama5d4: fix pinctrl compatible string
	spi: Fix scatterlist elements size in spi_map_buf
	xen-netfront: Fix hang on device removal
	regmap: Fix reversed bounds check in regmap_raw_write()
	ACPI / video: Add quirk to force acpi-video backlight on Samsung 670Z5E
	ACPI / hotplug / PCI: Check presence of slot itself in get_slot_status()
	USB: gadget: f_midi: fixing a possible double-free in f_midi
	USB:fix USB3 devices behind USB3 hubs not resuming at hibernate thaw
	usb: dwc3: pci: Properly cleanup resource
	smb3: Fix root directory when server returns inode number of zero
	HID: i2c-hid: fix size check and type usage
	powerpc/powernv: Handle unknown OPAL errors in opal_nvram_write()
	powerpc/64: Fix smp_wmb barrier definition use use lwsync consistently
	powerpc/powernv: define a standard delay for OPAL_BUSY type retry loops
	powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops
	HID: Fix hid_report_len usage
	HID: core: Fix size as type u32
	ASoC: ssm2602: Replace reg_default_raw with reg_default
	thunderbolt: Resume control channel after hibernation image is created
	irqchip/gic: Take lock when updating irq type
	random: use a tighter cap in credit_entropy_bits_safe()
	jbd2: if the journal is aborted then don't allow update of the log tail
	ext4: don't update checksum of new initialized bitmaps
	ext4: protect i_disksize update by i_data_sem in direct write path
	ext4: fail ext4_iget for root directory if unallocated
	RDMA/ucma: Don't allow setting RDMA_OPTION_IB_PATH without an RDMA device
	RDMA/rxe: Fix an out-of-bounds read
	ALSA: pcm: Fix UAF at PCM release via PCM timer access
	IB/srp: Fix srp_abort()
	IB/srp: Fix completion vector assignment algorithm
	dmaengine: at_xdmac: fix rare residue corruption
	libnvdimm, namespace: use a safe lookup for dimm device name
	nfit, address-range-scrub: fix scrub in-progress reporting
	um: Compile with modern headers
	um: Use POSIX ucontext_t instead of struct ucontext
	iommu/vt-d: Fix a potential memory leak
	mmc: jz4740: Fix race condition in IRQ mask update
	clk: mvebu: armada-38x: add support for 1866MHz variants
	clk: mvebu: armada-38x: add support for missing clocks
	clk: fix false-positive Wmaybe-uninitialized warning
	clk: bcm2835: De-assert/assert PLL reset signal when appropriate
	pwm: rcar: Fix a condition to prevent mismatch value setting to duty
	thermal: imx: Fix race condition in imx_thermal_probe()
	dt-bindings: clock: mediatek: add binding for fixed-factor clock axisel_d4
	watchdog: f71808e_wdt: Fix WD_EN register read
	vfio/pci: Virtualize Maximum Read Request Size
	ALSA: pcm: Use ERESTARTSYS instead of EINTR in OSS emulation
	ALSA: pcm: Avoid potential races between OSS ioctls and read/write
	ALSA: pcm: Return -EBUSY for OSS ioctls changing busy streams
	ALSA: pcm: Fix mutex unbalance in OSS emulation ioctls
	ALSA: pcm: Fix endless loop for XRUN recovery in OSS emulation
	ext4: don't allow r/w mounts if metadata blocks overlap the superblock
	drm/amdgpu: Add an ATPX quirk for hybrid laptop
	drm/amdgpu: Fix always_valid bos multiple LRU insertions.
	drm/amdgpu: Fix PCIe lane width calculation
	drm/rockchip: Clear all interrupts before requesting the IRQ
	drm/radeon: Fix PCIe lane width calculation
	ALSA: line6: Use correct endpoint type for midi output
	ALSA: rawmidi: Fix missing input substream checks in compat ioctls
	ALSA: hda - New VIA controller suppor no-snoop path
	random: fix crng_ready() test
	random: crng_reseed() should lock the crng instance that it is modifying
	random: add new ioctl RNDRESEEDCRNG
	HID: hidraw: Fix crash on HIDIOCGFEATURE with a destroyed device
	MIPS: uaccess: Add micromips clobbers to bzero invocation
	MIPS: memset.S: EVA & fault support for small_memset
	MIPS: memset.S: Fix return of __clear_user from Lpartial_fixup
	MIPS: memset.S: Fix clobber of v1 in last_fixup
	powerpc/eeh: Fix enabling bridge MMIO windows
	powerpc/lib: Fix off-by-one in alternate feature patching
	udf: Fix leak of UTF-16 surrogates into encoded strings
	jffs2_kill_sb(): deal with failed allocations
	hypfs_kill_super(): deal with failed allocations
	orangefs_kill_sb(): deal with allocation failures
	rpc_pipefs: fix double-dput()
	Don't leak MNT_INTERNAL away from internal mounts
	autofs: mount point create should honour passed in mode
	mm/filemap.c: fix NULL pointer in page_cache_tree_insert()
	fanotify: fix logic of events on child
	writeback: safer lock nesting
	block/mq: fix potential deadlock during cpu hotplug
	Linux 4.9.96

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 20 insertions, 9 deletions

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 0c23ced255cb..8d08a8062904 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -434,8 +434,9 @@ struct crng_state primary_crng = {
  * its value (from 0->1->2).
  */
 static int crng_init = 0;
-#define crng_ready() (likely(crng_init > 0))
+#define crng_ready() (likely(crng_init > 1))
 static int crng_init_cnt = 0;
+static unsigned long crng_global_init_time = 0;
 #define CRNG_INIT_CNT_THRESH (2*CHACHA20_KEY_SIZE)
 static void _extract_crng(struct crng_state *crng,
 			  __u8 out[CHACHA20_BLOCK_SIZE]);
@@ -741,7 +742,7 @@ retry:
 
 static int credit_entropy_bits_safe(struct entropy_store *r, int nbits)
 {
-	const int nbits_max = (int)(~0U >> (ENTROPY_SHIFT + 1));
+	const int nbits_max = r->poolinfo->poolwords * 32;
 
 	if (nbits < 0)
 		return -EINVAL;
@@ -800,7 +801,7 @@ static int crng_fast_load(const char *cp, size_t len)
 
 	if (!spin_trylock_irqsave(&primary_crng.lock, flags))
 		return 0;
-	if (crng_ready()) {
+	if (crng_init != 0) {
 		spin_unlock_irqrestore(&primary_crng.lock, flags);
 		return 0;
 	}
@@ -836,7 +837,7 @@ static void crng_reseed(struct crng_state *crng, struct entropy_store *r)
 		_crng_backtrack_protect(&primary_crng, buf.block,
 					CHACHA20_KEY_SIZE);
 	}
-	spin_lock_irqsave(&primary_crng.lock, flags);
+	spin_lock_irqsave(&crng->lock, flags);
 	for (i = 0; i < 8; i++) {
 		unsigned long	rv;
 		if (!arch_get_random_seed_long(&rv) &&
@@ -852,7 +853,7 @@ static void crng_reseed(struct crng_state *crng, struct entropy_store *r)
 		wake_up_interruptible(&crng_init_wait);
 		pr_notice("random: crng init done\n");
 	}
-	spin_unlock_irqrestore(&primary_crng.lock, flags);
+	spin_unlock_irqrestore(&crng->lock, flags);
 }
 
 static inline void maybe_reseed_primary_crng(void)
@@ -872,8 +873,9 @@ static void _extract_crng(struct crng_state *crng,
 {
 	unsigned long v, flags;
 
-	if (crng_init > 1 &&
-	    time_after(jiffies, crng->init_time + CRNG_RESEED_INTERVAL))
+	if (crng_ready() &&
+	    (time_after(crng_global_init_time, crng->init_time) ||
+	     time_after(jiffies, crng->init_time + CRNG_RESEED_INTERVAL)))
 		crng_reseed(crng, crng == &primary_crng ? &input_pool : NULL);
 	spin_lock_irqsave(&crng->lock, flags);
 	if (arch_get_random_long(&v))
@@ -1153,7 +1155,7 @@ void add_interrupt_randomness(int irq, int irq_flags)
 	fast_mix(fast_pool);
 	add_interrupt_bench(cycles);
 
-	if (!crng_ready()) {
+	if (unlikely(crng_init == 0)) {
 		if ((fast_pool->count >= 64) &&
 		    crng_fast_load((char *) fast_pool->pool,
 				   sizeof(fast_pool->pool))) {
@@ -1668,6 +1670,7 @@ static int rand_initialize(void)
 	init_std_data(&input_pool);
 	init_std_data(&blocking_pool);
 	crng_initialize(&primary_crng);
+	crng_global_init_time = jiffies;
 
 #ifdef CONFIG_NUMA
 	pool = kcalloc(nr_node_ids, sizeof(*pool), GFP_KERNEL|__GFP_NOFAIL);
@@ -1854,6 +1857,14 @@ static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 		input_pool.entropy_count = 0;
 		blocking_pool.entropy_count = 0;
 		return 0;
+	case RNDRESEEDCRNG:
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+		if (crng_init < 2)
+			return -ENODATA;
+		crng_reseed(&primary_crng, NULL);
+		crng_global_init_time = jiffies - 1;
+		return 0;
 	default:
 		return -EINVAL;
 	}
@@ -2148,7 +2159,7 @@ void add_hwgenerator_randomness(const char *buffer, size_t count,
 {
 	struct entropy_store *poolp = &input_pool;
 
-	if (!crng_ready()) {
+	if (unlikely(crng_init == 0)) {
 		crng_fast_load(buffer, count);
 		return;
 	}