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3e593f6675
linux-next/arch/arm64/kernel
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David A. Long 3e593f6675 arm64: Improve kprobes test for atomic sequence 
Kprobes searches backwards a finite number of instructions to determine if
there is an attempt to probe a load/store exclusive sequence. It stops when
it hits the maximum number of instructions or a load or store exclusive.
However this means it can run up past the beginning of the function and
start looking at literal constants. This has been shown to cause a false
positive and blocks insertion of the probe. To fix this, further limit the
backwards search to stop if it hits a symbol address from kallsyms. The
presumption is that this is the entry point to this code (particularly for
the common case of placing probes at the beginning of functions).

This also improves efficiency by not searching code that is not part of the
function. There may be some possibility that the label might not denote the
entry path to the probed instruction but the likelihood seems low and this
is just another example of how the kprobes user really needs to be
careful about what they are doing.

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: David A. Long <dave.long@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-09-15 08:33:46 +01:00
..
probes arm64: Improve kprobes test for atomic sequence 2016-09-15 08:33:46 +01:00
vdso arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO 2016-07-12 16:06:32 +01:00
.gitignore arm64: Build infrastructure 2012-09-17 13:42:21 +01:00
acpi_numa.c arm64/numa: avoid inconsistent information to be printed 2016-09-09 14:59:08 +01:00
acpi_parking_protocol.c arm64: kernel: acpi: fix ioremap in ACPI parking protocol cpu_postboot 2016-02-26 15:39:52 +00:00
acpi.c arm64: acpi: add acpi=on cmdline option to prefer ACPI boot over DT 2016-04-26 14:37:41 +01:00
alternative.c arm64: alternative: Add support for patching adrp instructions 2016-09-09 15:03:28 +01:00
arm64ksyms.c Merge branch 'for-next/kprobes' into for-next/core 2016-07-21 18:20:41 +01:00
armv8_deprecated.c Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-29 13:55:30 -07:00
asm-offsets.c arm64: Work around systems with mismatched cache line sizes 2016-09-09 15:03:29 +01:00
cacheinfo.c arm64: simplify sysreg manipulation 2016-09-09 11:43:50 +01:00
cpu_errata.c arm64: Work around systems with mismatched cache line sizes 2016-09-09 15:03:29 +01:00
cpu_ops.c arm64: apply __ro_after_init to some objects 2016-08-22 12:32:29 +01:00
cpu-reset.h arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
cpu-reset.S arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
cpufeature.c arm64: Rearrange CPU errata workaround checks 2016-09-09 15:03:28 +01:00
cpuidle.c arm64: add support for ACPI Low Power Idle(LPI) 2016-07-21 23:29:38 +02:00
cpuinfo.c arm64: Rearrange CPU errata workaround checks 2016-09-09 15:03:28 +01:00
debug-monitors.c arm64: simplify sysreg manipulation 2016-09-09 11:43:50 +01:00
efi-entry.S arm64: move early boot code to the .init segment 2016-04-14 18:11:30 +01:00
efi.c arm64: efi: avoid block mappings for unaligned UEFI memory regions 2016-07-01 11:56:26 +01:00
entry32.S arm64: entry32: remove pointless register assignment 2015-07-10 16:47:13 +01:00
entry-fpsimd.S arm64: fpsimd: fix a typo in fpsimd_save_partial_state ENDPROC 2014-07-31 11:42:42 +01:00
entry-ftrace.S arm64: ftrace: fix function_graph tracer panic 2015-10-02 11:12:56 +01:00
entry.S arm64: use alternative auto-nop 2016-09-12 10:46:07 +01:00
fpsimd.c arm64: Fix misspellings in comments. 2016-03-04 18:19:17 +00:00
ftrace.c arm64: ftrace: modify a stack frame in a safe way 2015-12-21 17:26:01 +00:00
head.S arm64: head.S: document the use of callee saved registers 2016-09-02 11:47:51 +01:00
hibernate-asm.S arm64: Introduce raw_{d,i}cache_line_size 2016-09-09 15:03:29 +01:00
hibernate.c Revert "arm64: hibernate: Refuse to hibernate if the boot cpu is offline" 2016-08-26 11:21:25 +01:00
hw_breakpoint.c arm64: hw_breakpoint: convert CPU hotplug notifier to new infrastructure 2016-09-01 13:45:51 +01:00
hyp-stub.S arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
image.h arm64 updates for 4.7: 2016-05-16 17:17:24 -07:00
insn.c arm64: insn: Add helpers for adrp offsets 2016-09-09 15:03:28 +01:00
io.c arm64: optimize memcpy_{from,to}io() and memset_io() 2014-11-06 17:25:27 +00:00
irq.c arm64: remove irq_count and do_softirq_own_stack() 2015-12-21 17:26:01 +00:00
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kaslr.c arm64: apply __ro_after_init to some objects 2016-08-22 12:32:29 +01:00
kgdb.c arm64: Blacklist non-kprobe-able symbol 2016-07-19 15:03:20 +01:00
kuser32.S arm64: Add __NR_* definitions for compat syscalls 2014-07-10 11:02:40 +01:00
machine_kexec.c arm64/kexec: Add pr_debug output 2016-06-27 16:31:26 +01:00
Makefile arm64: Set UTS_MACHINE in the Makefile 2016-08-31 12:31:38 +01:00
module-plts.c arm64: add support for module PLTs 2016-02-24 14:57:24 +00:00
module.c arm64: add support for kernel ASLR 2016-02-24 14:57:27 +00:00
module.lds arm64: add support for module PLTs 2016-02-24 14:57:24 +00:00
paravirt.c arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops 2015-12-21 14:40:54 +00:00
pci.c Merge branch 'pci/resource' into next 2016-08-01 12:23:44 -05:00
perf_callchain.c perf core: Add a 'nr' field to perf_event_callchain_context 2016-05-16 23:11:51 -03:00
perf_event.c arm64: perf: move to common attr_group fields 2016-09-09 14:51:51 +01:00
perf_regs.c perf: Move task_pt_regs sampling into arch code 2015-01-09 11:12:28 +01:00
process.c arm64: simplify sysreg manipulation 2016-09-09 11:43:50 +01:00
psci.c ARM: 8511/1: ARM64: kernel: PSCI: move PSCI idle management code to drivers/firmware 2016-02-11 15:33:38 +00:00
ptrace.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2016-07-29 17:38:46 -07:00
relocate_kernel.S arm64: Introduce raw_{d,i}cache_line_size 2016-09-09 15:03:29 +01:00
return_address.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
setup.c arm64: Set UTS_MACHINE in the Makefile 2016-08-31 12:31:38 +01:00
signal32.c arm64: Fix misspellings in comments. 2016-03-04 18:19:17 +00:00
signal.c arm64: factor work_pending state machine to C 2016-08-22 10:00:48 +01:00
sleep.S arm64: kernel: re-export _cpu_resume() from sleep.S 2016-09-05 10:24:55 +01:00
smccc-call.S ARM: 8480/2: arm64: add implementation for arm-smccc 2016-01-04 16:24:45 +00:00
smp_spin_table.c arm64: vmlinux.ld: Add mmuoff data sections and move mmuoff text into idmap 2016-08-25 18:00:30 +01:00
smp.c arm64: Rearrange CPU errata workaround checks 2016-09-09 15:03:28 +01:00
stacktrace.c arm64: ftrace: add save_stack_trace_regs() 2016-09-05 13:41:52 +01:00
suspend.c arm64: hw_breakpoint: convert CPU hotplug notifier to new infrastructure 2016-09-01 13:45:51 +01:00
sys32.c arm64: fix implementation of mmap2 compat syscall 2015-03-19 10:43:51 +00:00
sys_compat.c arm64: simplify sysreg manipulation 2016-09-09 11:43:50 +01:00
sys.c arm64: compat: Check for AArch32 state 2016-04-20 12:22:42 +01:00
time.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
topology.c arm64: kernel: remove non-legit DT warnings when booting using ACPI 2015-07-27 11:08:41 +01:00
trace-events-emulation.h arm64: Trace emulation of AArch32 legacy instructions 2014-11-20 16:35:02 +00:00
traps.c arm64: Work around systems with mismatched cache line sizes 2016-09-09 15:03:29 +01:00
vdso.c arm64: apply __ro_after_init to some objects 2016-08-22 12:32:29 +01:00
vmlinux.lds.S arm64: vmlinux.ld: Add mmuoff data sections and move mmuoff text into idmap 2016-08-25 18:00:30 +01:00