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83db3dde26
linux/arch/powerpc/kernel
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Ananth N Mavinakayanahalli 83db3dde26 [POWERPC] kprobes: Fix possible system crash during out-of-line single-stepping 
- On archs that have no-exec support, we vmalloc() a executable scratch
area of PAGE_SIZE and divide it up into an array of slots of maximum
instruction size for that arch
- On a kprobe registration, the original instruction is copied to the
first available free slot, so if multiple kprobes are registered, chances
are, they get contiguous slots
- On POWER4, due to not having coherent icaches, we could hit a situation
where a probe that is registered on one processor, is hit immediately on
another. This second processor could have fetched the stream of text from
the out-of-line single-stepping area *before* the probe registration
completed, possibly due to an earlier (and a different) kprobe hit and
hence would see stale data at the slot.

Executing such an arbitrary instruction lead to a problem as reported
in LTC bugzilla 23555.

The correct solution is to call flush_icache_range() as soon as the
instruction is copied for out-of-line single-stepping, so the correct
instruction is seen on all processors.

Thanks to Will Schmidt who tracked this down.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Acked-by: Will Schmidt <will_schmidt@vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-08-17 16:41:10 +10:00
..
vdso32 [PATCH] vDSO hash-style fix 2006-07-31 13:28:43 -07:00
vdso64 [PATCH] vDSO hash-style fix 2006-07-31 13:28:43 -07:00
align.c [PATCH] powerpc: Implement support for setting little-endian mode via prctl 2006-06-09 21:24:15 +10:00
asm-offsets.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
binfmt_elf32.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
btext.c [POWERPC] Fix various offb and BootX-related issues 2006-07-03 17:19:48 +10:00
cpu_setup_6xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
cpu_setup_power4.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
cputable.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
crash_dump.c [PATCH] powerpc: Kdump header cleanup 2006-05-19 15:02:16 +10:00
crash.c [POWERPC] Make crash.c work on 32-bit and 64-bit 2006-08-17 16:41:10 +10:00
dma_64.c
entry_32.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
entry_64.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
firmware.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
fpu.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_4xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_8xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_32.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_44x.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_64.S [POWERPC] force 64bit mode in fwnmi handlers to workaround firmware bugs 2006-07-29 04:07:08 +10:00
head_booke.h [PATCH] powerpc: Fix Kernel FP unavail exception for BookE 2006-02-10 16:51:50 +11:00
head_fsl_booke.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ibmebus.c [PATCH] powerpc: fix trigger handling in the new irq code 2006-07-10 13:24:20 -07:00
idle_6xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
idle_power4.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
idle.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
init_task.c
iomap.c [PATCH] powerpc: remove io_page_mask 2006-04-22 18:45:05 +10:00
iommu.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
irq.c [PATCH] powerpc: fix trigger handling in the new irq code 2006-07-10 13:24:20 -07:00
kprobes.c [POWERPC] kprobes: Fix possible system crash during out-of-line single-stepping 2006-08-17 16:41:10 +10:00
l2cr_6xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
legacy_serial.c [POWERPC] Fix legacy_serial.c error handling on 32 bits 2006-07-26 01:27:27 +10:00
lparcfg.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
lparmap.c [PATCH] powerpc: Fix iSeries bug in VMALLOCBASE/VMALLOC_START consolidation 2006-01-09 15:06:06 +11:00
machine_kexec_32.c Storage class should be first 2006-06-26 18:57:34 +02:00
machine_kexec_64.c [POWERPC] Make crash.c work on 32-bit and 64-bit 2006-08-17 16:41:10 +10:00
machine_kexec.c [POWERPC] Move some kexec logic into machine_kexec.c 2006-08-17 16:41:10 +10:00
Makefile [POWERPC] Make crash.c work on 32-bit and 64-bit 2006-08-17 16:41:10 +10:00
misc_32.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
misc_64.S [POWERPC] Minor comment fix for misc_64.S 2006-07-31 14:37:46 +10:00
misc.S [POWERPC] Consolidate some of kernel/misc*.S 2006-06-28 15:19:00 +10:00
module_32.c powerpc: Move module.c over to arch/powerpc 2006-03-27 19:28:58 +11:00
module_64.c [PATCH] powerpc64: Fix loading of modules without a .toc section 2006-04-28 21:04:49 +10:00
nvram_64.c [PATCH] nvram_print_partitions cosmetic fixup 2006-04-29 18:08:05 +10:00
of_device.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
paca.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pci_32.c [PATCH] powerpc: fix trigger handling in the new irq code 2006-07-10 13:24:20 -07:00
pci_64.c [PATCH] powerpc: fix trigger handling in the new irq code 2006-07-10 13:24:20 -07:00
pci_direct_iommu.c [POWERPC] cleanup dma_mapping_ops 2006-06-15 19:31:26 +10:00
pci_dn.c [PATCH] powerpc: clean up iSeries PCI probe 2006-05-24 16:08:57 +10:00
pci_iommu.c [POWERPC] cleanup dma_mapping_ops 2006-06-15 19:31:26 +10:00
perfmon_fsl_booke.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pmc.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ppc32.h
ppc_ksyms.c [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
proc_ppc64.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
process.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
prom_init.c [POWERPC] Fix 32 bits warning in prom_init.c 2006-07-26 01:26:43 +10:00
prom_parse.c [PATCH] powerpc: make OF interrupt tree parsing more strict 2006-07-10 13:24:20 -07:00
prom.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
ptrace32.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ptrace-common.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ptrace.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
rtas_flash.c [PATCH] powerpc: reorg RTAS delay code 2006-06-09 21:21:06 +10:00
rtas_pci.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
rtas-proc.c [PATCH] powerpc: Avoid __initcall warnings 2006-04-13 09:27:26 -07:00
rtas-rtc.c [PATCH] powerpc: reorg RTAS delay code 2006-06-09 21:21:06 +10:00
rtas.c [POWERPC] Fix might-sleep warning on removing cpus 2006-08-08 16:00:11 +10:00
semaphore.c
setup_32.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
setup_64.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
setup-common.c [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
setup.h [PATCH] powerpc: Make early xmon logic immune to location of early parsing 2006-05-19 15:02:12 +10:00
signal_32.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
signal_64.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
smp-tbsync.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
smp.c [POWERPC] Fix non-MPIC CHRPs with CONFIG_SMP set 2006-07-26 01:27:04 +10:00
swsusp_32.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
sys_ppc32.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
syscalls.c [PATCH] powerpc: declare arch syscalls in <asm/syscalls.h> 2006-03-27 14:48:22 +11:00
sysfs.c [PATCH] cpu hotplug: replace __devinit* with __cpuinit* for cpu notifications 2006-07-31 13:28:39 -07:00
systbl.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
tau_6xx.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
time.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
traps.c [POWERPC] Make crash.c work on 32-bit and 64-bit 2006-08-17 16:41:10 +10:00
udbg_16550.c [POWERPC] Fix default clock for udbg_16550 2006-07-26 01:27:13 +10:00
udbg.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
vdso.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
vecemu.c
vector.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
vio.c [POWERPC] Add new interrupt mapping core and change platforms to use it 2006-07-03 21:36:01 +10:00
vmlinux.lds.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00