Extricate ibt from validate_branch() so they can be executed (or ported)
independently from each other.
While shuffling code around, simplify and improve the ibt logic:
- Ignore an explicit list of known sections which reference functions
for reasons other than indirect branching to them. This helps prevent
unnnecesary sealing.
- Warn on missing !ENDBR for all other sections, not just .data and
.rodata. This finds additional warnings, because there are sections
other than .[ro]data which reference function pointers. For example,
the ksymtab sections which are used for exporting symbols.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/fd1435e46bb95f81031b8fb1fa360f5f787e4316.1650300597.git.jpoimboe@redhat.com
To help prevent objtool users from having to do math to convert function
addresses to section addresses, and to help out with finding data
addresses reported by IBT validation, add an option to print the section
address in addition to the function address.
Normal:
vmlinux.o: warning: objtool: fixup_exception()+0x2d1: unreachable instruction
With '--sec-address':
vmlinux.o: warning: objtool: fixup_exception()+0x2d1 (.text+0x76c51): unreachable instruction
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/2cea4d5299d53d1a4c09212a6ad7820aa46fda7a.1650300597.git.jpoimboe@redhat.com
Objtool has a fairly singular focus. It runs on object files and does
validations and transformations which can be combined in various ways.
The subcommand model has never been a good fit, making it awkward to
combine and remove options.
Remove the "check" and "orc" subcommands in favor of a more traditional
cmdline option model. This makes it much more flexible to use, and
easier to port individual features to other arches.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/5c61ebf805e90aefc5fa62bc63468ffae53b9df6.1650300597.git.jpoimboe@redhat.com
Split the existing options into two groups: actions, which actually do
something; and options, which modify the actions in some way.
Also there's no need to have short flags for all the non-action options.
Reserve short flags for the more important actions.
While at it:
- change a few of the short flags to be more intuitive
- make option descriptions more consistently descriptive
- sort options in the source like they are when printed
- move options to a global struct
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/9dcaa752f83aca24b1b21f0b0eeb28a0c181c0b0.1650300597.git.jpoimboe@redhat.com
The OPTION_GROUP option type is a way of grouping certain options
together in the printed usage text. It happens to be completely broken,
thanks to the fact that the subcmd option sorting just sorts everything,
without regard for grouping. Luckily, nobody uses this option anyway,
though that will change shortly.
Fix it by sorting each group individually.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/e167ea3a11e2a9800eb062c1fd0f13e9cd05140c.1650300597.git.jpoimboe@redhat.com
Occasionally objtool driven code patching (think .static_call_sites
.retpoline_sites etc..) goes sideways and it tries to patch an
instruction that doesn't match.
Much head-scatching and cursing later the problem is as outlined below
and affects every section that objtool generates for us, very much
including the ORC data. The below uses .static_call_sites because it's
convenient for demonstration purposes, but as mentioned the ORC
sections, .retpoline_sites and __mount_loc are all similarly affected.
Consider:
foo-weak.c:
extern void __SCT__foo(void);
__attribute__((weak)) void foo(void)
{
return __SCT__foo();
}
foo.c:
extern void __SCT__foo(void);
extern void my_foo(void);
void foo(void)
{
my_foo();
return __SCT__foo();
}
These generate the obvious code
(gcc -O2 -fcf-protection=none -fno-asynchronous-unwind-tables -c foo*.c):
foo-weak.o:
0000000000000000 <foo>:
0: e9 00 00 00 00 jmpq 5 <foo+0x5> 1: R_X86_64_PLT32 __SCT__foo-0x4
foo.o:
0000000000000000 <foo>:
0: 48 83 ec 08 sub $0x8,%rsp
4: e8 00 00 00 00 callq 9 <foo+0x9> 5: R_X86_64_PLT32 my_foo-0x4
9: 48 83 c4 08 add $0x8,%rsp
d: e9 00 00 00 00 jmpq 12 <foo+0x12> e: R_X86_64_PLT32 __SCT__foo-0x4
Now, when we link these two files together, you get something like
(ld -r -o foos.o foo-weak.o foo.o):
foos.o:
0000000000000000 <foo-0x10>:
0: e9 00 00 00 00 jmpq 5 <foo-0xb> 1: R_X86_64_PLT32 __SCT__foo-0x4
5: 66 2e 0f 1f 84 00 00 00 00 00 nopw %cs:0x0(%rax,%rax,1)
f: 90 nop
0000000000000010 <foo>:
10: 48 83 ec 08 sub $0x8,%rsp
14: e8 00 00 00 00 callq 19 <foo+0x9> 15: R_X86_64_PLT32 my_foo-0x4
19: 48 83 c4 08 add $0x8,%rsp
1d: e9 00 00 00 00 jmpq 22 <foo+0x12> 1e: R_X86_64_PLT32 __SCT__foo-0x4
Noting that ld preserves the weak function text, but strips the symbol
off of it (hence objdump doing that funny negative offset thing). This
does lead to 'interesting' unused code issues with objtool when ran on
linked objects, but that seems to be working (fingers crossed).
So far so good.. Now lets consider the objtool static_call output
section (readelf output, old binutils):
foo-weak.o:
Relocation section '.rela.static_call_sites' at offset 0x2c8 contains 1 entry:
Offset Info Type Symbol's Value Symbol's Name + Addend
0000000000000000 0000000200000002 R_X86_64_PC32 0000000000000000 .text + 0
0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1
foo.o:
Relocation section '.rela.static_call_sites' at offset 0x310 contains 2 entries:
Offset Info Type Symbol's Value Symbol's Name + Addend
0000000000000000 0000000200000002 R_X86_64_PC32 0000000000000000 .text + d
0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1
foos.o:
Relocation section '.rela.static_call_sites' at offset 0x430 contains 4 entries:
Offset Info Type Symbol's Value Symbol's Name + Addend
0000000000000000 0000000100000002 R_X86_64_PC32 0000000000000000 .text + 0
0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1
0000000000000008 0000000100000002 R_X86_64_PC32 0000000000000000 .text + 1d
000000000000000c 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1
So we have two patch sites, one in the dead code of the weak foo and one
in the real foo. All is well.
*HOWEVER*, when the toolchain strips unused section symbols it
generates things like this (using new enough binutils):
foo-weak.o:
Relocation section '.rela.static_call_sites' at offset 0x2c8 contains 1 entry:
Offset Info Type Symbol's Value Symbol's Name + Addend
0000000000000000 0000000200000002 R_X86_64_PC32 0000000000000000 foo + 0
0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1
foo.o:
Relocation section '.rela.static_call_sites' at offset 0x310 contains 2 entries:
Offset Info Type Symbol's Value Symbol's Name + Addend
0000000000000000 0000000200000002 R_X86_64_PC32 0000000000000000 foo + d
0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1
foos.o:
Relocation section '.rela.static_call_sites' at offset 0x430 contains 4 entries:
Offset Info Type Symbol's Value Symbol's Name + Addend
0000000000000000 0000000100000002 R_X86_64_PC32 0000000000000000 foo + 0
0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1
0000000000000008 0000000100000002 R_X86_64_PC32 0000000000000000 foo + d
000000000000000c 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1
And now we can see how that foos.o .static_call_sites goes side-ways, we
now have _two_ patch sites in foo. One for the weak symbol at foo+0
(which is no longer a static_call site!) and one at foo+d which is in
fact the right location.
This seems to happen when objtool cannot find a section symbol, in which
case it falls back to any other symbol to key off of, however in this
case that goes terribly wrong!
As such, teach objtool to create a section symbol when there isn't
one.
Fixes: 44f6a7c075 ("objtool: Fix seg fault with Clang non-section symbols")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20220419203807.655552918@infradead.org
Objtool's function fallthrough detection only works on C objects.
The distinction between C and assembly objects no longer makes sense
with objtool running on vmlinux.o.
Now that copy_user_64.S has been fixed up, and an objtool sibling call
detection bug has been fixed, the asm code is in "compliance" and this
hack is no longer needed. Remove it.
Fixes: ed53a0d971 ("x86/alternative: Use .ibt_endbr_seal to seal indirect calls")
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/b434cff98eca3a60dcc64c620d7d5d405a0f441c.1649718562.git.jpoimboe@redhat.com
In add_jump_destinations(), sibling call detection requires 'insn->func'
to be valid. But alternative instructions get their 'func' set in
handle_group_alt(), which runs *after* add_jump_destinations(). So
sibling calls in alternatives code don't get properly detected.
Fix that by changing the initialization order: call
add_special_section_alts() *before* add_jump_destinations().
This also means the special case for a missing 'jump_dest' in
add_jump_destinations() can be removed, as it has already been dealt
with.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/c02e0a0a2a4286b5f848d17c77fdcb7e0caf709c.1649718562.git.jpoimboe@redhat.com
When a "!ENDBR" warning is reported for a data section, objtool just
prints the text address of the relocation target twice, without giving
any clues about the location of the original data reference:
vmlinux.o: warning: objtool: dcbnl_netdevice_event()+0x0: .text+0xb64680: data relocation to !ENDBR: dcbnl_netdevice_event+0x0
Instead, print the address of the data reference, in addition to the
address of the relocation target.
vmlinux.o: warning: objtool: dcbnl_nb+0x0: .data..read_mostly+0xe260: data relocation to !ENDBR: dcbnl_netdevice_event+0x0
Fixes: 89bc853eae ("objtool: Find unused ENDBR instructions")
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/762e88d51300e8eaf0f933a5b0feae20ac033bea.1650300597.git.jpoimboe@redhat.com
Apparently GCC can fail to inline a 'static inline' single caller
function:
lib/strnlen_user.o: warning: objtool: strnlen_user()+0x33: call to do_strnlen_user() with UACCESS enabled
lib/strncpy_from_user.o: warning: objtool: strncpy_from_user()+0x33: call to do_strncpy_from_user() with UACCESS enabled
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220408094718.262932488@infradead.org
A crash was observed in the ORC unwinder:
BUG: stack guard page was hit at 000000000dd984a2 (stack is 00000000d1caafca..00000000613712f0)
kernel stack overflow (page fault): 0000 [#1] SMP NOPTI
CPU: 93 PID: 23787 Comm: context_switch1 Not tainted 5.4.145 #1
RIP: 0010:unwind_next_frame
Call Trace:
<NMI>
perf_callchain_kernel
get_perf_callchain
perf_callchain
perf_prepare_sample
perf_event_output_forward
__perf_event_overflow
perf_ibs_handle_irq
perf_ibs_nmi_handler
nmi_handle
default_do_nmi
do_nmi
end_repeat_nmi
This was really two bugs:
1) The perf IBS code passed inconsistent regs to the unwinder.
2) The unwinder didn't handle the bad input gracefully.
Fix the latter bug. The ORC unwinder needs to be immune against bad
inputs. The problem is that stack_access_ok() doesn't recheck the
validity of the full range of registers after switching to the next
valid stack with get_stack_info(). Fix that.
[ jpoimboe: rewrote commit log ]
Signed-off-by: Dmitry Monakhov <dmtrmonakhov@yandex-team.ru>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/1650353656-956624-1-git-send-email-dmtrmonakhov@yandex-team.ru
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
When resuming from system sleep state, restore_processor_state()
restores the boot CPU MSRs. These MSRs could be emulated by microcode.
If microcode is not loaded yet, writing to emulated MSRs leads to
unchecked MSR access error:
...
PM: Calling lapic_suspend+0x0/0x210
unchecked MSR access error: WRMSR to 0x10f (tried to write 0x0...0) at rIP: ... (native_write_msr)
Call Trace:
<TASK>
? restore_processor_state
x86_acpi_suspend_lowlevel
acpi_suspend_enter
suspend_devices_and_enter
pm_suspend.cold
state_store
kobj_attr_store
sysfs_kf_write
kernfs_fop_write_iter
new_sync_write
vfs_write
ksys_write
__x64_sys_write
do_syscall_64
entry_SYSCALL_64_after_hwframe
RIP: 0033:0x7fda13c260a7
To ensure microcode emulated MSRs are available for restoration, load
the microcode on the boot CPU before restoring these MSRs.
[ Pawan: write commit message and productize it. ]
Fixes: e2a1256b17 ("x86/speculation: Restore speculation related MSRs during S3 resume")
Reported-by: Kyle D. Pelton <kyle.d.pelton@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Tested-by: Kyle D. Pelton <kyle.d.pelton@intel.com>
Cc: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215841
Link: https://lore.kernel.org/r/4350dfbf785cd482d3fafa72b2b49c83102df3ce.1650386317.git.pawan.kumar.gupta@linux.intel.com
Pull xen fixlet from Juergen Gross:
"A single cleanup patch for the Xen balloon driver"
* tag 'for-linus-5.18-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/balloon: don't use PV mode extra memory for zone device allocations
Pull x86 fixes from Thomas Gleixner:
"Two x86 fixes related to TSX:
- Use either MSR_TSX_FORCE_ABORT or MSR_IA32_TSX_CTRL to disable TSX
to cover all CPUs which allow to disable it.
- Disable TSX development mode at boot so that a microcode update
which provides TSX development mode does not suddenly make the
system vulnerable to TSX Asynchronous Abort"
* tag 'x86-urgent-2022-04-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/tsx: Disable TSX development mode at boot
x86/tsx: Use MSR_TSX_CTRL to clear CPUID bits
Pull timer fixes from Thomas Gleixner:
"A small set of fixes for the timers core:
- Fix the warning condition in __run_timers() which does not take
into account that a CPU base (especially the deferrable base) never
has a timer armed on it and therefore the next_expiry value can
become stale.
- Replace a WARN_ON() in the NOHZ code with a WARN_ON_ONCE() to
prevent endless spam in dmesg.
- Remove the double star from a comment which is not meant to be in
kernel-doc format"
* tag 'timers-urgent-2022-04-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
tick/sched: Fix non-kernel-doc comment
tick/nohz: Use WARN_ON_ONCE() to prevent console saturation
timers: Fix warning condition in __run_timers()
Pull SMP fixes from Thomas Gleixner:
"Two fixes for the SMP core:
- Make the warning condition in flush_smp_call_function_queue()
correct, which checked a just emptied list head for being empty
instead of validating that there was no pending entry on the
offlined CPU at all.
- The @cpu member of struct cpuhp_cpu_state is initialized when the
CPU hotplug thread for the upcoming CPU is created. That's too late
because the creation of the thread can fail and then the following
rollback operates on CPU0. Get rid of the CPU member and hand the
CPU number to the involved functions directly"
* tag 'smp-urgent-2022-04-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
cpu/hotplug: Remove the 'cpu' member of cpuhp_cpu_state
smp: Fix offline cpu check in flush_smp_call_function_queue()
Pull irq fix from Thomas Gleixner:
"A single fix for the interrupt affinity spreading logic to take into
account that there can be an imbalance between present and possible
CPUs, which causes already assigned bits to be overwritten"
* tag 'irq-urgent-2022-04-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
genirq/affinity: Consider that CPUs on nodes can be unbalanced
Pull power supply fixes from Sebastian Reichel:
- Fix a regression with battery data failing to load from DT
* tag 'for-v5.18-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply:
power: supply: Reset err after not finding static battery
power: supply: samsung-sdi-battery: Add missing charge restart voltages
Pull i2c fixes from Wolfram Sang:
"Regular set of fixes for drivers and the dev-interface"
* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: ismt: Fix undefined behavior due to shift overflowing the constant
i2c: dev: Force case user pointers in compat_i2cdev_ioctl()
i2c: dev: check return value when calling dev_set_name()
i2c: qcom-geni: Use dev_err_probe() for GPI DMA error
i2c: imx: Implement errata ERR007805 or e7805 bus frequency limit
i2c: pasemi: Wait for write xfers to finish
Pull gpio fixes from Bartosz Golaszewski:
"A single fix for gpio-sim and two patches for GPIO ACPI pulled from
Andy:
- fix the set/get_multiple() callbacks in gpio-sim
- use correct format characters in gpiolib-acpi
- use an unsigned type for pins in gpiolib-acpi"
* tag 'gpio-fixes-for-v5.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
gpio: sim: fix setting and getting multiple lines
gpiolib: acpi: Convert type for pin to be unsigned
gpiolib: acpi: use correct format characters
Pull ARM SoC fixes from Arnd Bergmann:
"There are a number of SoC bugfixes that came in since the merge
window, and more of them are already pending.
This batch includes:
- A boot time regression fix for davinci that triggered on
multi_v5_defconfig when booting any platform
- Defconfig updates to address removed features, changed symbol names
or dependencies, for gemini, ux500, and pxa
- Email address changes for Krzysztof Kozlowski
- Build warning fixes for ep93xx and iop32x
- Devicetree warning fixes across many platforms
- Minor bugfixes for the reset controller, memory controller and SCMI
firmware subsystems plus the versatile-express board"
* tag 'soc-fixes-5.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (34 commits)
ARM: config: Update Gemini defconfig
arm64: dts: qcom/sdm845-shift-axolotl: Fix boolean properties with values
ARM: dts: align SPI NOR node name with dtschema
ARM: dts: Fix more boolean properties with values
arm/arm64: dts: qcom: Fix boolean properties with values
arm64: dts: imx: Fix imx8*-var-som touchscreen property sizes
arm: dts: imx: Fix boolean properties with values
arm64: dts: tegra: Fix boolean properties with values
arm: dts: at91: Fix boolean properties with values
arm: configs: imote2: Drop defconfig as board support dropped.
ep93xx: clock: Don't use plain integer as NULL pointer
ep93xx: clock: Fix UAF in ep93xx_clk_register_gate()
ARM: vexpress/spc: Fix all the kernel-doc build warnings
ARM: vexpress/spc: Fix kernel-doc build warning for ve_spc_cpu_in_wfi
ARM: config: u8500: Re-enable AB8500 battery charging
ARM: config: u8500: Add some common hardware
memory: fsl_ifc: populate child nodes of buses and mfd devices
ARM: config: Refresh U8500 defconfig
firmware: arm_scmi: Fix sparse warnings in OPTEE transport driver
firmware: arm_scmi: Replace zero-length array with flexible-array member
...
Pull random number generator fixes from Jason Donenfeld:
- Per your suggestion, random reads now won't fail if there's a page
fault after some non-zero amount of data has been read, which makes
the behavior consistent with all other reads in the kernel.
- Rather than an inconsistent mix of random_get_entropy() returning an
unsigned long or a cycles_t, now it just returns an unsigned long.
- A memcpy() was replaced with an memmove(), because the addresses are
sometimes overlapping. In practice the destination is always before
the source, so not really an issue, but better to be correct than
not.
* tag 'random-5.18-rc3-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random:
random: use memmove instead of memcpy for remaining 32 bytes
random: make random_get_entropy() return an unsigned long
random: allow partial reads if later user copies fail
Pull SCSI fixes from James Bottomley:
"13 fixes, all in drivers.
The most extensive changes are in the iscsi series (affecting drivers
qedi, cxgbi and bnx2i), the next most is scsi_debug, but that's just a
simple revert and then minor updates to pm80xx"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: iscsi: MAINTAINERS: Add Mike Christie as co-maintainer
scsi: qedi: Fix failed disconnect handling
scsi: iscsi: Fix NOP handling during conn recovery
scsi: iscsi: Merge suspend fields
scsi: iscsi: Fix unbound endpoint error handling
scsi: iscsi: Fix conn cleanup and stop race during iscsid restart
scsi: iscsi: Fix endpoint reuse regression
scsi: iscsi: Release endpoint ID when its freed
scsi: iscsi: Fix offload conn cleanup when iscsid restarts
scsi: iscsi: Move iscsi_ep_disconnect()
scsi: pm80xx: Enable upper inbound, outbound queues
scsi: pm80xx: Mask and unmask upper interrupt vectors 32-63
Revert "scsi: scsi_debug: Address races following module load"
intel-gpio for v5.18-2
* Couple of fixes related to handling unsigned value of the pin from ACPI
gpiolib:
- acpi: Convert type for pin to be unsigned
- acpi: use correct format characters
Pull dma-mapping fix from Christoph Hellwig:
- avoid a double memory copy for swiotlb (Chao Gao)
* tag 'dma-mapping-5.18-2' of git://git.infradead.org/users/hch/dma-mapping:
dma-direct: avoid redundant memory sync for swiotlb
In order to immediately overwrite the old key on the stack, before
servicing a userspace request for bytes, we use the remaining 32 bytes
of block 0 as the key. This means moving indices 8,9,a,b,c,d,e,f ->
4,5,6,7,8,9,a,b. Since 4 < 8, for the kernel implementations of
memcpy(), this doesn't actually appear to be a problem in practice. But
relying on that characteristic seems a bit brittle. So let's change that
to a proper memmove(), which is the by-the-books way of handling
overlapping memory copies.
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Merge misc fixes from Andrew Morton:
"14 patches.
Subsystems affected by this patch series: MAINTAINERS, binfmt, and
mm (tmpfs, secretmem, kasan, kfence, pagealloc, zram, compaction,
hugetlb, vmalloc, and kmemleak)"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
mm: kmemleak: take a full lowmem check in kmemleak_*_phys()
mm/vmalloc: fix spinning drain_vmap_work after reading from /proc/vmcore
revert "fs/binfmt_elf: use PT_LOAD p_align values for static PIE"
revert "fs/binfmt_elf: fix PT_LOAD p_align values for loaders"
hugetlb: do not demote poisoned hugetlb pages
mm: compaction: fix compiler warning when CONFIG_COMPACTION=n
mm: fix unexpected zeroed page mapping with zram swap
mm, page_alloc: fix build_zonerefs_node()
mm, kfence: support kmem_dump_obj() for KFENCE objects
kasan: fix hw tags enablement when KUNIT tests are disabled
irq_work: use kasan_record_aux_stack_noalloc() record callstack
mm/secretmem: fix panic when growing a memfd_secret
tmpfs: fix regressions from wider use of ZERO_PAGE
MAINTAINERS: Broadcom internal lists aren't maintainers
Pull device mapper fixes from Mike Snitzer:
- Fix memory corruption in DM integrity target when tag_size is less
than digest size.
- Fix DM multipath's historical-service-time path selector to not use
sched_clock() and ktime_get_ns(); only use ktime_get_ns().
- Fix dm_io->orig_bio NULL pointer dereference in dm_zone_map_bio() due
to 5.18 changes that overlooked DM zone's use of ->orig_bio
- Fix for regression that broke the use of dm_accept_partial_bio() for
"abnormal" IO (e.g. WRITE ZEROES) that does not need duplicate bios
- Fix DM's issuing of empty flush bio so that it's size is 0.
* tag 'for-5.18/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
dm: fix bio length of empty flush
dm: allow dm_accept_partial_bio() for dm_io without duplicate bios
dm zone: fix NULL pointer dereference in dm_zone_map_bio
dm mpath: only use ktime_get_ns() in historical selector
dm integrity: fix memory corruption when tag_size is less than digest size
