Dan Williams
90a545e981
restrict /dev/mem to idle io memory ranges ...
This effectively promotes IORESOURCE_BUSY to IORESOURCE_EXCLUSIVE
semantics by default. If userspace really believes it is safe to access
the memory region it can also perform the extra step of disabling an
active driver. This protects device address ranges with read side
effects and otherwise directs userspace to use the driver.
Persistent memory presents a large "mistake surface" to /dev/mem as now
accidental writes can corrupt a filesystem.
In general if a device driver is busily using a memory region it already
informs other parts of the kernel to not touch it via
request_mem_region(). /dev/mem should honor the same safety restriction
by default. Debugging a device driver from userspace becomes more
difficult with this enabled. Any application using /dev/mem or mmap of
sysfs pci resources will now need to perform the extra step of either:
1/ Disabling the driver, for example:
echo <device id> > /dev/bus/<parent bus>/drivers/<driver name>/unbind
2/ Rebooting with "iomem=relaxed" on the command line
3/ Recompiling with CONFIG_IO_STRICT_DEVMEM=n
Traditional users of /dev/mem like dosemu are unaffected because the
first 1MB of memory is not subject to the IO_STRICT_DEVMEM restriction.
Legacy X configurations use /dev/mem to talk to graphics hardware, but
that functionality has since moved to kernel graphics drivers.
Cc: Arnd Bergmann <[email protected] >
Cc: Russell King <[email protected] >
Cc: Andrew Morton <[email protected] >
Cc: Greg Kroah-Hartman <[email protected] >
Acked-by: Kees Cook <[email protected] >
Acked-by: Ingo Molnar <[email protected] >
Signed-off-by: Dan Williams <[email protected] >
2016-01-09 06:30:49 -08:00
crypto: 842 - Add CRC and validation support
2015-10-14 22:23:17 +08:00
fonts: Add 6x10 font
2014-10-09 11:35:48 +03:00
lz4: fix system halt at boot kernel on x86_64
2015-05-24 11:56:29 -07:00
lzo: check for length overrun in variable length encoding.
2014-09-28 11:08:01 +02:00
asm-generic cleanups
2015-11-06 14:22:15 -08:00
md/raid6: delta syndrome for ARM NEON
2015-08-31 19:29:05 +02:00
lib/xz: enable all filters by default in Kconfig
2014-06-04 16:54:18 -07:00
zlib_deflate/deftree: remove bi_reverse()
2015-09-10 13:29:01 -07:00
zlib: clean up some dead code
2014-08-06 18:01:24 -07:00
X.509: Implement simple static OID registry
2012-10-08 13:50:18 +10:30
argv_split(): teach it to handle mutable strings
2013-04-29 18:28:19 -07:00
ASN.1: Handle 'ANY OPTIONAL' in grammar
2015-08-05 13:38:07 +01:00
assoc_array: Include rcupdate.h for call_rcu() definition
2015-01-07 16:08:41 +00:00
atomic: Provide atomic_{or,xor,and}
2015-07-27 14:06:24 +02:00
atomic: Add simple atomic_t tests
2015-07-27 14:06:24 +02:00
syscalls: implement execveat() system call
2014-12-13 12:42:51 -08:00
usb/core: use bin2bcd() for bcdDevice in RH
2012-09-10 11:13:16 -07:00
lib/bitmap.c: bitmap_parselist can accept string with whitespaces on head or tail
2015-09-10 13:29:01 -07:00
ARM: 8187/1: add CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction
2014-12-22 16:43:06 +00:00
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
module: Sanitize RCU usage and locking
2015-05-28 11:31:52 +09:30
X.509: do not emit any informational output
2013-06-19 17:54:06 +02:00
printk: Provide a wake_up_klogd() off-case
2013-03-22 16:41:20 -07:00
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
lib/checksum.c: fix build for generic csum_tcpudp_nofold
2015-01-29 11:57:38 -08:00
lib/clz_ctz.c: add prototype declarations in lib/clz_ctz.c
2014-04-03 16:21:12 -07:00
lib: Fix multiple definitions of clz_tab
2012-02-02 10:34:23 +11:00
lib: Add a generic cmdline parse function parse_option_str
2014-10-03 18:40:58 +01:00
audit: Add generic compat syscall support
2014-03-20 10:11:35 -04:00
cpu: rewrite cpu-notifier-error-inject module
2012-07-30 17:25:22 -07:00
sched/topology: Rename topology_thread_cpumask() to topology_sibling_cpumask()
2015-05-27 15:22:15 +02:00
revert "cpumask: don't perform while loop in cpumask_next_and()"
2015-06-18 17:00:23 -10:00
lib: crc-itu-t.[ch] fix 0x0x prefix in integer constants
2015-05-26 15:26:43 +02:00
lib: introduce crc_t10dif_update()
2015-05-30 22:42:24 -07:00
lib/crc7: Shift crc7() output left 1 bit
2014-05-16 14:26:52 -04:00
lib: crc32: Add some additional __pure annotations
2014-06-25 16:04:00 -07:00
crc32: select an algorithm via Kconfig
2012-03-23 16:58:38 -07:00
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
kbuild: include core debug info when DEBUG_INFO_REDUCED
2015-06-11 15:08:32 +02:00
mutex: Add support for wound/wait style locks
2013-06-26 12:10:56 +02:00
lib/debugobjects.c: convert printk(KERN_DEBUG to pr_debug
2014-06-04 16:53:53 -07:00
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
lib/decompress: set the compressor name to NULL on error
2015-07-17 16:39:54 -07:00
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
lib/decompress_unlzma: Do a NULL check for pointer
2015-09-10 13:29:01 -07:00
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
lib/decompressors: use real out buf size for gunzip with kernel
2015-09-10 13:29:01 -07:00
devres: fix a for loop bounds check
2015-10-05 04:49:54 +01:00
KEYS: Merge the type-specific data with the payload data
2015-10-21 15:18:36 +01:00
remove abs64()
2015-11-09 15:11:24 -08:00
dma-debug: check nents in dma_sync_sg*
2015-11-06 17:50:42 -08:00
asmlinkage: Add explicit __visible to drivers/*, lib/*, kernel/*
2014-05-05 16:07:46 -07:00
lib/dynamic_debug.c: use kstrdup_const
2015-11-06 17:50:42 -08:00
lib/dynamic_queue_limits.c: simplify includes
2015-02-12 18:54:15 -08:00
earlycpio.c: Fix the confusing comment of find_cpio_data().
2013-08-14 23:24:01 +02:00
fault-inject: fix inverted interval/probability values in printk
2015-10-23 17:55:10 +09:00
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
lib: add fdt_empty_tree.c
2014-04-30 19:49:37 +01:00
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
of/lib: Allow scripts/dtc/libfdt to be used from kernel code
2012-07-23 13:54:52 +01:00
lib: rename lib/find_next_bit.c to lib/find_bit.c
2015-04-17 09:03:54 -04:00
reciprocal_divide: update/correction of the algorithm
2014-01-21 23:17:20 -08:00
proportions: add @gfp to init functions
2014-09-08 09:51:30 +09:00
lib/gcd.c: prevent possible div by 0
2012-10-06 03:04:57 +09:00
lib: crc32: constify crc32 lookup table
2015-02-13 21:21:35 -08:00
genalloc: add support of multiple gen_pools per device
2015-09-04 16:54:41 -07:00
lib/glob.c: add CONFIG_GLOB_SELFTEST
2014-08-06 18:01:25 -07:00
lib/halfmd4.c: use rol32 inline function in the ROUND macro
2015-11-06 17:50:42 -08:00
lib/hexdump.c: truncate output in case of overflow
2015-11-06 17:50:42 -08:00
Make ARCH_HAS_FAST_MULTIPLIER a real config variable
2014-09-13 11:14:53 -07:00
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
lib/int_sqrt.c: optimize square root algorithm
2013-04-29 18:28:19 -07:00
lib/interval_tree.c: simplify includes
2015-02-12 18:54:15 -08:00
lib: Export interval_tree
2014-05-05 09:09:14 +02:00
Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP
2014-04-07 16:36:11 -07:00
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
2015-11-05 16:34:48 -08:00
The following text was taken from the original review request:
2012-03-24 10:24:31 -07:00
x86, mm: support huge KVA mappings on x86
2015-04-14 16:49:04 -07:00
Merge branch 'iov_iter' into for-next
2015-04-11 22:26:51 -04:00
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
lib/is_single_threaded.c: change current_is_single_threaded() to use for_each_thread()
2015-11-06 17:50:42 -08:00
ddr: add LPDDR2 data from JESD209-2
2012-05-02 00:04:06 -07:00
lib/kasprintf.c: introduce kvasprintf_const
2015-11-06 17:50:42 -08:00
lib/Kconfig: ZLIB_DEFLATE must select BITREVERSE
2015-10-16 11:42:28 -07:00
restrict /dev/mem to idle io memory ranges
2016-01-09 06:30:49 -08:00
mm, slub, kasan: enable user tracking by default with KASAN=y
2015-11-05 19:34:48 -08:00
kdb: Allow access to sensitive commands to be restricted by default
2014-11-11 09:31:52 -06:00
kfifo: use BUG_ON
2014-08-08 15:57:25 -07:00
klist: implement klist_prev()
2015-07-28 08:50:42 +01:00
lib/kobject.c: use kvasprintf_const for formatting ->name
2015-11-06 17:50:42 -08:00
lib/kobject_uevent.c: remove redundant include
2015-02-12 18:54:15 -08:00
kstrto*: accept "-0" for signed conversion
2015-09-10 13:29:01 -07:00
block: fix blk_stack_limits() regression due to lcm() change
2015-03-31 09:45:50 -06:00
crypto: LLVMLinux: Remove VLAIS usage from libcrc32c.c
2014-10-14 10:51:23 +02:00
rcu: Fix broken strings in RCU's source code.
2012-07-06 06:01:49 -07:00
lib/list_sort: use late_initcall to hook in self tests
2015-06-16 14:12:35 -04:00
lib/llist.c: fix data race in llist_del_first
2015-11-06 17:50:42 -08:00
locking/lockdep: Revert qrwlock recusive stuff
2014-10-03 06:09:30 +02:00
locking/lockref: Remove homebrew cmpxchg64_relaxed() macro definition
2015-08-12 11:59:04 +02:00
lru_cache: remove use of seq_printf return value
2015-04-15 16:35:25 -07:00
test_printf: test printf family at runtime
2015-11-06 17:50:42 -08:00
lib/md5.c: simplify include
2015-02-12 18:54:15 -08:00
memory: memory notifier error injection module
2012-07-30 17:25:22 -07:00
string: introduce memweight()
2012-07-30 17:25:16 -07:00
mac_pton: Use bool not int return
2014-06-25 17:45:43 -07:00
netlink: pad nla_memcpy dest buffer with zeroes
2015-03-31 14:07:24 -04:00
ARM: 8439/1: Fix backtrace generation when IPI is masked
2015-10-03 16:40:51 +01:00
mode_t, whack-a-mole at 11...
2013-04-09 14:13:05 -04:00
fault-injection: notifier error injection
2012-07-30 17:25:22 -07:00
powerpc+of: Rename and fix OF reconfig notifier error inject module
2012-12-14 10:32:52 +11:00
Give the OID registry file module info to avoid kernel tainting
2013-05-05 14:38:00 -07:00
once: make helper generic for calling functions once
2015-10-08 05:26:36 -07:00
lib/parser.c: put EXPORT_SYMBOLs in the conventional place
2014-01-23 16:36:55 -08:00
libnvdimm for 4.3:
2015-09-08 14:35:59 -07:00
percpu_ref: make INIT_ATOMIC and switch_to_atomic() sticky
2014-09-24 13:31:50 -04:00
percpu_counter: batch size aware __percpu_counter_compare()
2015-05-29 07:39:34 +10:00
mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM
2015-11-06 17:50:42 -08:00
percpu: add test module for various percpu operations
2013-11-13 12:09:11 +09:00
lib/plist.c: remove redundant include
2015-02-12 18:54:16 -08:00
PM: PM notifier error injection module
2012-07-30 17:25:22 -07:00
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
random32: add prandom_init_once helper for own rngs
2015-10-08 05:26:38 -07:00
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
lib: Change mail address of Oskar Schirmer
2012-05-17 15:18:37 +02:00
rbtree: Make lockless searches non-fatal
2015-05-28 11:32:04 +09:30
rbtree/test: test rbtree_postorder_for_each_entry_safe()
2014-01-23 16:37:03 -08:00
reciprocal_divide: update/correction of the algorithm
2014-01-21 23:17:20 -08:00
lib: fix data race in rhashtable_rehash_one
2015-09-22 17:36:07 -07:00
scatterlist: allow limited chaining without ARCH_HAS_SG_CHAIN
2015-08-17 08:12:51 -06:00
seq_buf: Fix seq_buf_bprintf() truncation
2015-03-04 23:40:19 -05:00
lib: scatterlist: add sg splitting function
2015-08-24 14:28:01 -06:00
lib: EXPORT_SYMBOL sha_init
2015-03-23 22:12:08 -04:00
lib/show_mem.c: correct reserved memory calculation
2015-09-08 15:35:28 -07:00
percpu: add preemption checks to __this_cpu ops
2014-04-07 16:36:14 -07:00
lib/sort: Add 64 bit swap function
2015-06-25 17:00:40 -07:00
lib/stmp_device.c: replace module.h include
2015-02-12 18:54:16 -08:00
lib/string.c: add ULL suffix to the constant definition
2015-11-10 16:32:11 -08:00
lib/string_helpers.c: fix infinite loop in string_get_size()
2015-09-17 21:16:07 -07:00
lib: move strncpy_from_unsafe() into mm/maccess.c
2015-08-31 12:36:10 -07:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-06-22 15:52:04 -07:00
Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block
2015-06-25 15:22:36 -07:00
lib/syscall.c: unexport task_current_syscall()
2014-04-03 16:21:06 -07:00
hexdump: Make test data really const
2015-06-25 17:00:40 -07:00
kstrto*: accept "-0" for signed conversion
2015-09-10 13:29:01 -07:00
lib/test-string_helpers.c: add string_get_size() tests
2015-11-06 17:50:42 -08:00
bpf: add mod default A and X test cases
2015-11-05 00:05:50 -05:00
test: add firmware_class loader test
2014-07-17 18:44:19 -07:00
lib: test_kasan: add some testcases
2015-11-05 19:34:48 -08:00
test: add minimal module for verification testing
2014-01-23 16:36:57 -08:00
test_printf: test printf family at runtime
2015-11-06 17:50:42 -08:00
rhashtable-test: extend to test concurrency
2015-08-17 14:33:47 -07:00
locking/static_keys: Provide a selftest
2015-08-03 11:51:12 +02:00
locking/static_keys: Make verify_keys() static
2015-08-05 09:53:40 +02:00
test: check copy_to/from_user boundary validation
2014-01-23 16:36:57 -08:00
lib/textsearch.c: remove textsearch_put reference from comments
2014-10-14 02:18:14 +02:00
timerqueue: Let timerqueue_add/del return information
2015-04-22 17:06:49 +02:00
Move utf16 functions to kernel core and rename
2013-04-15 21:23:03 +01:00
Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
2013-04-30 17:04:09 -07:00
uuid: use prandom_bytes()
2013-04-29 18:28:42 -07:00
lib/vsprintf.c: update documentation
2015-11-06 17:50:42 -08:00
90a545e981