linux/arch
Peter Oberparleiter f386c61fe1 gcov: exclude code operating in userspace from profiling
Fix for this issue on x86_64:

rostedt@goodmis.org wrote:
> On bootup of the latest kernel my init segfaults. Debugging it,
> I found  that vread_tsc (a vsyscall) increments some strange
> kernel memory:
>
> 0000000000000000 <vread_tsc>:
>    0:   55                      push   %rbp
>    1:   48 ff 05 00 00 00 00    incq   0(%rip)
>                         # 8 <vread_tsc+0x8>
>                         4: R_X86_64_PC32        .bss+0x3c
>    8:   48 89 e5                mov    %rsp,%rbp
>    b:   66 66 90                xchg   %ax,%ax
>    e:   48 ff 05 00 00 00 00    incq   0(%rip)
>                         # 15 <vread_tsc+0x15>
>                         11: R_X86_64_PC32       .bss+0x44
>   15:   66 66 90                xchg   %ax,%ax
>   18:   48 ff 05 00 00 00 00    incq   0(%rip)
>                         # 1f <vread_tsc+0x1f>
>                         1b: R_X86_64_PC32       .bss+0x4c
>   1f:   0f 31                   rdtsc
>
>
> Those "incq" is very bad to happen in vsyscall memory, since
> userspace can not modify it. You need to make something prevent
> profiling of vsyscall  memory (like I do with ftrace).

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-07-06 13:57:03 -07:00
..
alpha alpha: fix percpu build breakage 2009-06-30 18:55:59 -07:00
arm [ARM] 5562/2: at91: add gpio button support for at91sam9g20ek 2009-06-29 11:19:27 +01:00
avr32 Move FAULT_FLAG_xyz into handle_mm_fault() callers 2009-06-21 13:08:22 -07:00
blackfin Blackfin: fix dma-mapping build errors 2009-06-22 22:31:00 -04:00
cris Merge branch 'for-linus' of git://www.jni.nu/cris 2009-06-23 10:47:01 -07:00
frv FRV: Add basic performance counter support 2009-07-01 19:38:31 -07:00
h8300 h8/300: fix incorrect "select" directives in arch/h8300/Kconfig.cpu. 2009-06-23 12:50:05 -07:00
ia64 [IA64] address compiler warnings perfmon.c/salinfo.c 2009-06-30 14:26:34 -07:00
m32r Move FAULT_FLAG_xyz into handle_mm_fault() callers 2009-06-21 13:08:22 -07:00
m68k Move FAULT_FLAG_xyz into handle_mm_fault() callers 2009-06-21 13:08:22 -07:00
m68knommu ptrace: remove PT_DTRACE from m68k, m68knommu 2009-06-18 13:03:48 -07:00
microblaze Move FAULT_FLAG_xyz into handle_mm_fault() callers 2009-06-21 13:08:22 -07:00
mips MIPS: Fix CONFIG_FLATMEM version of pfn_valid() 2009-07-03 15:45:29 +01:00
mn10300 Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes 2009-07-04 09:46:01 -07:00
parisc parisc: use generic atomic64 on 32-bit 2009-07-03 03:34:13 +00:00
powerpc Merge branch 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-30 19:02:59 -07:00
s390 KVM: s390: Allow stfle instruction in the guest 2009-06-28 14:10:30 +03:00
sh sh: Fix compiler error and include the definition of IS_ERR_VALUE 2009-07-02 03:32:48 +09:00
sparc sparc32: Fix makefile not generating required files 2009-06-25 19:56:02 -07:00
um UML: Fix some apparent bitrot 2009-06-25 11:22:13 -07:00
x86 gcov: exclude code operating in userspace from profiling 2009-07-06 13:57:03 -07:00
xtensa xtensa: enable m41t80 driver in s6105_defconfig 2009-06-22 02:38:11 -07:00
.gitignore
Kconfig gcov: add gcov profiling infrastructure 2009-06-18 13:03:57 -07:00