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8bf1101bd5
linux-next/arch/powerpc/kernel
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Jim Keniston 8bf1101bd5 [PATCH] kprobes: Fix return probes on sys_execve 
Fix a bug in kprobes that can cause an Oops or even a crash when a return
probe is installed on one of the following functions: sys_execve,
do_execve, load_*_binary, flush_old_exec, or flush_thread.  The fix is to
remove the call to kprobe_flush_task() in flush_thread().  This fix has
been tested on all architectures for which the return-probes feature has
been implemented (i386, x86_64, ppc64, ia64).  Please apply.

BACKGROUND

Up to now, we have called kprobe_flush_task() under two situations: when a
task exits, and when it execs.  Flushing kretprobe_instances on exit is
correct because (a) do_exit() doesn't return, and (b) one or more
return-probed functions may be active when a task calls do_exit().  Neither
is the case for sys_execve() and its callees.

Initially, the mistaken call to kprobe_flush_task() on exec was harmless
because we put the "real" return address of each active probed function
back in the stack, just to be safe, when we recycled its
kretprobe_instance.  When support for ppc64 and ia64 was added, this safety
measure couldn't be employed, and was eventually dropped even for i386 and
x86_64.  sys_execve() and its callees were informally blacklisted for
return probes until this fix was developed.

Acked-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-23 16:08:39 -08:00
..
vdso32 [PATCH] powerpc: Make the vDSO functions set error code (#2) 2005-11-16 14:05:11 +11:00
vdso64 [PATCH] powerpc: Make the vDSO functions set error code (#2) 2005-11-16 14:05:11 +11:00
align.c [PATCH] powerpc: merge align.c 2005-11-18 14:39:23 +11:00
asm-offsets.c [PATCH] powerpc: vdso fixes (take #2) 2005-11-14 16:35:58 +11:00
binfmt_elf32.c ppc64: merge binfmt_elf32.c 2005-10-13 13:40:54 +10:00
btext.c powerpc: Get 64-bit configs to compile with ARCH=powerpc 2005-10-10 22:50:37 +10:00
cpu_setup_power4.S [PATCH] powerpc: Move various ppc64 files with no ppc32 equivalent to powerpc 2005-11-10 11:24:04 +11:00
cputable.c powerpc: Add user CPU features for POWER4, POWER5, POWER5+ and Cell. 2005-11-10 14:29:18 +11:00
dma_64.c powerpc: Move most remaining ppc64 files over to arch/powerpc 2005-11-14 17:30:17 +11:00
entry_32.S powerpc: Rename asm offset TRAP to _TRAP for 32-bit 2005-10-28 22:45:25 +10:00
entry_64.S [PATCH] audit_sysctl_exit can only be used with CONF_AUDIT_SYSCTL 2005-11-01 21:44:46 -08:00
firmware.c [PATCH] powerpc: Move various ppc64 files with no ppc32 equivalent to powerpc 2005-11-10 11:24:04 +11:00
fpu.S [PATCH] powerpc: Consolidate asm compatibility macros 2005-11-10 13:10:38 +11:00
head_4xx.S powerpc: Rename asm offset TRAP to _TRAP for 32-bit 2005-10-28 22:45:25 +10:00
head_8xx.S powerpc: Rename asm offset TRAP to _TRAP for 32-bit 2005-10-28 22:45:25 +10:00
head_32.S powerpc: Initialize secondary CPU setup for 32-bit SMP 2005-11-11 22:34:43 +11:00
head_44x.S [PATCH] powerpc: replace use of _GLOBAL with .globl 2005-10-17 21:43:12 +10:00
head_64.S [PATCH] powerpc: merge code values for identifying platforms 2005-11-10 13:37:51 +11:00
head_fsl_booke.S [PATCH] Update email address for Kumar 2005-11-13 18:14:10 -08:00
idle_6xx.S powerpc: Use reg.h instead of processor.h when we just want reg names 2005-10-10 22:20:10 +10:00
idle_64.c powerpc: Move remaining .c files from arch/ppc64 to arch/powerpc 2005-11-18 15:43:34 +11:00
idle_power4.S [PATCH] powerpc: Fix use of LOADBASE in merge tree 2005-10-17 21:43:12 +10:00
init_task.c powerpc: make process.c suitable for both 32-bit and 64-bit 2005-10-10 22:29:05 +10:00
ioctl32.c [SPARC]: Fix RTC compat ioctl kernel log spam. 2005-11-12 12:10:54 -08:00
iomap.c powerpc: Move most remaining ppc64 files over to arch/powerpc 2005-11-14 17:30:17 +11:00
iommu.c powerpc: Move most remaining ppc64 files over to arch/powerpc 2005-11-14 17:30:17 +11:00
irq.c powerpc: have only one definition of __irq_offset_value 2005-11-14 14:44:33 +11:00
kprobes.c powerpc: Move most remaining ppc64 files over to arch/powerpc 2005-11-14 17:30:17 +11:00
lparcfg.c powerpc: iSeries build fixes 2005-11-14 17:14:51 +11:00
lparmap.c [PATCH] ppc64: support 64k pages 2005-11-06 16:56:47 -08:00
machine_kexec_64.c powerpc: Move most remaining ppc64 files over to arch/powerpc 2005-11-14 17:30:17 +11:00
Makefile powerpc: Move remaining .c files from arch/ppc64 to arch/powerpc 2005-11-18 15:43:34 +11:00
misc_32.S powerpc: Fix delay functions for 601 processors 2005-11-18 14:08:12 +11:00
misc_64.S ppc64: remove ppc_irq_dispatch_handler 2005-11-09 16:19:53 +11:00
module_64.c powerpc: Move most remaining ppc64 files over to arch/powerpc 2005-11-14 17:30:17 +11:00
nvram_64.c powerpc: Move remaining .c files from arch/ppc64 to arch/powerpc 2005-11-18 15:43:34 +11:00
of_device.c powerpc: apply recent changes to merged code 2005-10-31 13:57:01 +11:00
paca.c [PATCH] powerpc: Merge vdso's and add vdso support to 32 bits kernel 2005-11-11 22:25:39 +11:00
pci_64.c powerpc: Merge pci.h 2005-11-19 20:46:04 +11:00
pci_direct_iommu.c powerpc: Move most remaining ppc64 files over to arch/powerpc 2005-11-14 17:30:17 +11:00
pci_dn.c powerpc: Move most remaining ppc64 files over to arch/powerpc 2005-11-14 17:30:17 +11:00
pci_iommu.c powerpc: Move most remaining ppc64 files over to arch/powerpc 2005-11-14 17:30:17 +11:00
pmc.c [PATCH] powerpc: Merge ppc64 pmc.[ch] with ppc32 perfmon.[ch] 2005-10-20 16:22:24 +10:00
ppc32.h powerpc: move include/asm-ppc64/ppc32.h to arch/powerpc/kernel 2005-11-03 16:03:28 +11:00
ppc_ksyms.c powerpc: Merge pci.h 2005-11-19 20:46:04 +11:00
proc_ppc64.c [PATCH] powerpc: Merge vdso's and add vdso support to 32 bits kernel 2005-11-11 22:25:39 +11:00
process.c [PATCH] kprobes: Fix return probes on sys_execve 2005-11-23 16:08:39 -08:00
prom_init.c [PATCH] powerpc: merge code values for identifying platforms 2005-11-10 13:37:51 +11:00
prom.c powerpc: Export a couple of prom functions 2005-11-14 17:30:40 +11:00
ptrace32.c powerpc: move include/asm-ppc64/ptrace-common.h to arch/powerpc/kernel 2005-11-19 20:47:22 +11:00
ptrace-common.h powerpc: move include/asm-ppc64/ptrace-common.h to arch/powerpc/kernel 2005-11-19 20:47:22 +11:00
ptrace.c powerpc: move include/asm-ppc64/ptrace-common.h to arch/powerpc/kernel 2005-11-19 20:47:22 +11:00
rtas_flash.c powerpc: Merge remaining RTAS code 2005-11-03 14:41:19 +11:00
rtas_pci.c [PATCH] powerpc: pci_64 fixes & cleanups 2005-11-16 13:29:46 +11:00
rtas-proc.c [PATCH] powerpc: Merge vdso's and add vdso support to 32 bits kernel 2005-11-11 22:25:39 +11:00
rtas-rtc.c powerpc: time-of-day fixes for 32-bit CHRP systems 2005-11-18 15:52:38 +11:00
rtas.c [PATCH] powerpc: merge code values for identifying platforms 2005-11-10 13:37:51 +11:00
semaphore.c powerpc: Merge enough to start building in arch/powerpc. 2005-09-26 16:04:21 +10:00
setup_32.c powerpc: have only one definition of __irq_offset_value 2005-11-14 14:44:33 +11:00
setup_64.c [PATCH] powerpc: Export htab start/end via device tree 2005-11-14 16:34:06 +11:00
setup-common.c [PATCH] powerpc: More debugging fixups 2005-11-16 13:29:40 +11:00
setup.h powerpc: create kernel/setup.h 2005-11-09 11:35:26 +11:00
signal_32.c powerpc: Fix clearing of the FPSCR when invoking a signal handler 2005-11-15 11:11:32 +11:00
signal_64.c powerpc: Fix clearing of the FPSCR when invoking a signal handler 2005-11-15 11:11:32 +11:00
smp-tbsync.c powerpc: Merge smp-tbsync.c (the generic timebase sync routine) 2005-11-04 13:28:58 +11:00
smp.c [PATCH] powerpc: More debugging fixups 2005-11-16 13:29:40 +11:00
sys_ppc32.c [PATCH] powerpc: merge code values for identifying platforms 2005-11-10 13:37:51 +11:00
syscalls.c [PATCH] powerpc: Fix mmap returning 64 bit addresses 2005-10-21 22:47:52 +10:00
sysfs.c [PATCH] powerpc: Merge vdso's and add vdso support to 32 bits kernel 2005-11-11 22:25:39 +11:00
systbl.S Merge rsync://oak/kernels/iseries/work/ 2005-10-18 14:53:41 +10:00
time.c powerpc: Fix delay functions for 601 processors 2005-11-18 14:08:12 +11:00
traps.c [PATCH] powerpc: Merge vdso's and add vdso support to 32 bits kernel 2005-11-11 22:25:39 +11:00
udbg_16550.c [PATCH] powerpc: Move udbg code to arch/powerpc 2005-11-11 22:23:34 +11:00
udbg_scc.c [PATCH] powerpc: Move udbg code to arch/powerpc 2005-11-11 22:23:34 +11:00
udbg.c [PATCH] powerpc: Move udbg code to arch/powerpc 2005-11-11 22:23:34 +11:00
vdso.c [PATCH] unpaged: VM_UNPAGED 2005-11-22 09:13:42 -08:00
vecemu.c [PATCH] powerpc: Move arch/ppc*/kernel/vecemu.c to arch/powerpc 2005-09-21 19:21:07 +10:00
vector.S powerpc: Use reg.h instead of processor.h when we just want reg names 2005-10-10 22:20:10 +10:00
vio.c [PATCH] ppc64: add MODALIAS= for vio bus 2005-11-09 07:55:51 -08:00
vmlinux.lds.S powerpc: Fix vmlinux.lds.S for 32-bit 2005-11-05 10:36:59 +11:00