Dmitry Safonov
b059a453b1
x86/vdso: Add mremap hook to vm_special_mapping ...
Add possibility for 32-bit user-space applications to move
the vDSO mapping.
Previously, when a user-space app called mremap() for the vDSO
address, in the syscall return path it would land on the previous
address of the vDSOpage, resulting in segmentation violation.
Now it lands fine and returns to userspace with a remapped vDSO.
This will also fix the context.vdso pointer for 64-bit, which does
not affect the user of vDSO after mremap() currently, but this
may change in the future.
As suggested by Andy, return -EINVAL for mremap() that would
split the vDSO image: that operation cannot possibly result in
a working system so reject it.
Renamed and moved the text_mapping structure declaration inside
map_vdso(), as it used only there and now it complements the
vvar_mapping variable.
There is still a problem for remapping the vDSO in glibc
applications: the linker relocates addresses for syscalls
on the vDSO page, so you need to relink with the new
addresses.
Without that the next syscall through glibc may fail:
Program received signal SIGSEGV, Segmentation fault.
#0 0xf7fd9b80 in __kernel_vsyscall ()
#1 0xf7ec8238 in _exit () from /usr/lib32/libc.so.6
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: 0x7f454c46@gmail.com
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20160628113539.13606-2-dsafonov@virtuozzo.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-08 14:17:51 +02:00
MTD updates for v4.7:
2016-05-24 11:00:20 -07:00
libceph: change ceph_osdmap_flag() to take osdc
2016-05-30 23:00:22 +02:00
Merge branch 'topic/xilinx' into for-linus
2016-05-17 10:15:34 +05:30
iio: st_sensors: switch to a threaded interrupt
2016-05-29 20:21:41 +01:00
irqchip/gic-v3: Fix copy+paste mistakes in defines
2016-06-02 17:59:44 +01:00
mfd: da9053: Fix compiler warning message for uninitialised variable
2016-06-30 07:44:23 +01:00
net/mlx4_en: Avoid unregister_netdev at shutdown flow
2016-06-22 16:38:11 -04:00
Round two of 4.7 rc fixes
2016-06-24 18:52:31 -07:00
MMC core:
2016-05-26 09:36:10 -07:00
misc: at24: Fix typo in at24 header file
2016-05-26 20:52:15 +02:00
qed*: Don't reset statistics on inner reload
2016-06-19 10:47:32 -07:00
regulator: Silence build warnings from regulator_can_change_voltage()
2016-05-17 18:06:18 +01:00
ARM: SoC driver updates for v4.7
2016-05-18 13:14:02 -07:00
rpc: share one xps between all backchannels
2016-06-15 10:32:25 -04:00
USB: EHCI: declare hostpc register as zero-length array
2016-06-24 17:03:12 -07:00
Merge branches 'acpi-pci', 'acpi-misc' and 'acpi-tools'
2016-05-16 16:45:48 +02:00
Merge branch 'for-4.7-zac' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
2016-05-23 17:53:39 -07:00
Merge branch 'stable-4.7' of git://git.infradead.org/users/pcmoore/audit
2016-06-29 15:18:47 -07:00
coredump: fix dumping through pipes
2016-06-07 22:07:09 -04:00
DAX error handling for 4.7
2016-05-26 19:34:26 -07:00
include/linux: apply __malloc attribute
2016-05-19 19:12:14 -07:00
bpf, perf: delay release of BPF prog after grace period
2016-06-29 05:42:55 -04:00
clk: Remove CLK_IS_ROOT flag
2016-06-01 14:56:57 -07:00
mm, oom, compaction: prevent from should_compact_retry looping for ever for costly orders
2016-05-20 17:58:30 -07:00
compiler.h: add support for malloc attribute
2016-05-19 19:12:14 -07:00
compiler.h: add support for malloc attribute
2016-05-19 19:12:14 -07:00
Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
2016-05-23 11:48:48 -07:00
cpuidle: Do not access cpuidle_devices when !CONFIG_CPU_IDLE
2016-06-02 23:05:27 +02:00
cpuset: use static key better and convert to new API
2016-05-19 19:12:14 -07:00
Filesystem DAX locking for 4.7
2016-05-26 20:00:28 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-06-20 10:41:51 -07:00
debugobjects: insulate non-fixup logic related to static obj from fixup callbacks
2016-05-19 19:12:14 -07:00
driver core update for 4.7-rc1
2016-05-20 21:26:15 -07:00
devpts: Make each mount of devpts an independent filesystem.
2016-06-05 10:36:01 -07:00
dma-buf: headerdoc fixes
2016-05-31 22:12:43 +05:30
efi: Fix for_each_efi_memory_desc_in_map() for empty memmaps
2016-06-03 09:57:35 +02:00
make IS_ERR_VALUE() complain about non-pointer-sized arguments
2016-05-27 16:03:22 -07:00
pnfs: rework LAYOUTGET retry handling
2016-05-17 15:48:12 -04:00
fence: add missing descriptions for fence
2016-05-31 22:17:05 +05:30
bpf: add generic constant blinding for use in jits
2016-05-16 13:49:32 -04:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-05-27 17:14:05 -07:00
FS-Cache: make check_consistency callback return int
2016-06-01 10:29:39 +02:00
fsnotify: avoid spurious EMFILE errors from inotify_init()
2016-05-19 19:12:14 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching
2016-05-17 17:11:27 -07:00
include/linux/genhd.h: move to use generic UUID library
2016-05-20 17:58:30 -07:00
printk/nmi: generic solution for safe printk in NMI
2016-05-20 17:58:30 -07:00
<linux/hash.h>: Add support for architecture-specific functions
2016-05-28 15:48:31 -04:00
huge mm: move_huge_pmd does not need new_vma
2016-05-19 19:12:14 -07:00
include/linux/hugetlb.h: use bool instead of int for hugepage_migration_supported()
2016-05-20 17:58:30 -07:00
include/linux/hugetlb*.h: clean up code
2016-05-20 17:58:30 -07:00
mm/hugetlb: is_vm_hugetlb_page() can return bool
2016-05-19 19:12:14 -07:00
net: diag: add missing declarations
2016-06-10 23:22:55 -07:00
fix up initial thread stack pointer vs thread_info confusion
2016-06-24 17:07:33 -07:00
PCI: Identify Enhanced Allocation (EA) BAR Equivalent resources in sysfs
2016-05-16 15:12:02 -05:00
isa: Dummy isa_register_driver should return error code
2016-06-17 20:47:11 -07:00
ibft: Expose iBFT acpi header via sysfs
2016-05-16 11:14:29 -04:00
locking/static_key: Fix concurrent static_key_slow_inc()
2016-06-24 08:23:16 +02:00
mm/kasan: add API to check memory regions
2016-05-20 17:58:30 -07:00
mm: mempool: kasan: don't poot mempool objects in quarantine
2016-06-24 17:23:52 -07:00
Staging and IIO driver update for 4.7-rc1
2016-05-20 22:20:48 -07:00
driver core update for 4.7-rc1
2016-05-20 21:26:15 -07:00
s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()
2016-05-23 17:04:14 -07:00
KVM: Create debugfs dir and stat files for each VM
2016-05-25 16:12:05 +02:00
leds: core: Fix brightness setting upon hardware blinking enabled
2016-06-08 11:47:06 +02:00
Merge branches 'for-4.7/core', 'for-4.7/livepatching-doc' and 'for-4.7/livepatching-ppc64' into for-linus
2016-05-17 12:06:35 +02:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-05-16 14:47:16 -07:00
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2016-05-19 09:21:36 -07:00
mm: vmscan: reduce size of inactive file list
2016-05-20 17:58:30 -07:00
mm: fix section mismatch warning
2016-05-27 15:23:32 -07:00
tmpfs: preliminary minor tidyups
2016-05-19 19:12:14 -07:00
include/linux: apply __malloc attribute
2016-05-19 19:12:14 -07:00
Revert "mm: make faultaround produce old ptes"
2016-06-24 17:23:52 -07:00
mm: update_lru_size do the __mod_zone_page_state
2016-05-19 19:12:14 -07:00
x86/vdso: Add mremap hook to vm_special_mapping
2016-07-08 14:17:51 +02:00
mm fix commmets: if SPARSEMEM, pgdata doesn't have page_ext
2016-05-20 17:58:30 -07:00
devpts: Make each mount of devpts an independent filesystem.
2016-06-05 10:36:01 -07:00
net: Don't forget pr_fmt on net_dbg_ratelimited for CONFIG_DYNAMIC_DEBUG
2016-06-15 22:07:57 -07:00
net: define gso types for IPx over IPv4 and IPv6
2016-05-20 18:03:15 -04:00
net: define gso types for IPx over IPv4 and IPv6
2016-05-20 18:03:15 -04:00
pnfs: rework LAYOUTGET retry handling
2016-05-17 15:48:12 -04:00
Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-05-17 15:05:23 -07:00
NFS: Add COPY nfs operation
2016-05-17 15:47:55 -04:00
NFS client updates for Linux 4.7
2016-05-26 10:33:33 -07:00
nilfs2: fix block comments
2016-05-23 17:04:14 -07:00
include/linux/nodemask.h: create next_node_in() helper
2016-05-19 19:12:14 -07:00
of: add missing const for of_parse_phandle_with_args() in !CONFIG_OF
2016-06-03 07:27:55 -05:00
drivers: of: Fix of_pci.h header guard
2016-06-08 08:18:06 -05:00
drivers: of: add definition of early_init_dt_alloc_reserved_memory_arch
2016-06-09 14:38:22 -05:00
signal: make oom_flags a bool
2016-05-23 17:04:14 -07:00
kernel/padata.c: removed unused code
2016-05-19 19:12:14 -07:00
mm: use unsigned long constant for page flags
2016-05-20 17:58:30 -07:00
mm: check the return value of lookup_page_ext for all call sites
2016-06-03 15:06:22 -07:00
mm: rename _count, field of the struct page, to _refcount
2016-05-19 19:12:14 -07:00
mm: tighten fault_in_pages_writeable()
2016-05-20 17:58:30 -07:00
PCI changes for the v4.7 merge window:
2016-05-19 13:10:54 -07:00
printk/nmi: generic solution for safe printk in NMI
2016-05-20 17:58:30 -07:00
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-05-25 17:05:40 -07:00
fs: poll/select/recvmmsg: use timespec64 for timeout events
2016-05-19 19:12:14 -07:00
printk/nmi: flush NMI messages on the system panic
2016-05-20 17:58:30 -07:00
pwm: Fix pwm_apply_args()
2016-06-23 18:37:05 +02:00
radix-tree: free up the bottom bit of exceptional entries for reuse
2016-05-20 17:58:30 -07:00
lib/uuid.c: move generate_random_uuid() to uuid.c
2016-05-20 17:58:30 -07:00
reservation: add headerdoc comments
2016-05-31 22:12:43 +05:30
reset: TRIVIAL: Add line break at same place for similar APIs
2016-06-29 21:24:53 +02:00
add down_write_killable_nested()
2016-05-26 00:04:58 -04:00
Clarify naming of thread info/stack allocators
2016-06-24 15:09:37 -07:00
sctp: sctp_diag should dump sctp socket type
2016-05-31 11:59:06 -07:00
Merge branch 'work.const-path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-05-17 14:41:03 -07:00
locking/seqcount: Re-fix raw_read_seqcount_latch()
2016-06-03 08:37:25 +02:00
signal: move the "sig < SIGRTMIN" check into siginmask(sig)
2016-05-23 17:04:14 -07:00
net: suppress warnings on dev_alloc_skb
2016-05-20 19:58:32 -04:00
include/linux: apply __malloc attribute
2016-05-19 19:12:14 -07:00
mm: SLAB freelist randomization
2016-05-19 19:12:14 -07:00
mm: slub: remove unused virt_to_obj()
2016-05-26 15:35:44 -07:00
sock_diag: do not broadcast raw socket destruction
2016-06-28 09:08:51 -04:00
include/linux: apply __malloc attribute
2016-05-19 19:12:14 -07:00
fs/namei.c: Add hashlen_string() function
2016-05-28 15:42:50 -04:00
mm, oom: rework oom detection
2016-05-20 17:58:30 -07:00
include/linux/syscalls.h: use pid_t instead of int
2016-05-20 17:58:30 -07:00
thermal: add the note for set_trip_temp
2016-06-01 22:25:48 +08:00
time: remove timespec_add_safe()
2016-05-19 19:12:14 -07:00
time: Make settimeofday error checking work again
2016-06-01 21:13:43 +02:00
This includes two new updates for the ftrace infrastructure.
2016-05-18 18:55:19 -07:00
TTY and Serial driver update for 4.7-rc1
2016-05-20 20:57:27 -07:00
signal: make oom_flags a bool
2016-05-23 17:04:14 -07:00
lib/uuid.c: remove FSF address
2016-05-20 17:58:30 -07:00
Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
2016-05-23 11:48:48 -07:00
mm, page_alloc: inline zone_statistics
2016-05-19 19:12:14 -07:00
switch ->setxattr() to passing dentry and inode separately
2016-05-27 20:09:16 -04:00
zsmalloc: require GFP in zs_malloc()
2016-05-20 17:58:30 -07:00
