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Chuck Ebbert ecd744eec3 x86 - 32-bit ptrace emulation mishandles 6th arg ... [ jdike - Pushing Chuck's patch - see http://lkml.org/lkml/2005/9/16/261 for some history and a test program. UML is also broken without this patch - its processes get SIGBUS from the corrupt 6th argument to mmap being interpretted as a file offset ] When the 32-bit vDSO is used to make a system call, the %ebp register for the 6th syscall arg has to be loaded from the user stack (where it's pushed by the vDSO user code). The native i386 kernel always does this before stopping for syscall tracing, so %ebp can be seen and modified via ptrace to access the 6th syscall argument. The x86-64 kernel fails to do this, presenting the stack address to ptrace instead. This makes the %rbp value seen by 64-bit ptrace of a 32-bit process, and the %ebp value seen by a 32-bit caller of ptrace, both differ from the native i386 behavior. This patch fixes the problem by putting the word loaded from the user stack into %rbp before calling syscall_trace_enter, and reloading the 6th syscall argument from there afterwards (so ptrace can change it). This makes the behavior match that of i386 kernels. Original-Patch-By: Roland McGrath <roland@redhat.com> Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com> Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		18 years ago
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alpha	alpha: sg_virt() fallout	18 years ago
arm	[ARM] pxa: fix one-shot timer mode	18 years ago
avr32	[AVR32] ARRAY_SIZE() cleanup	18 years ago
blackfin	Blackfin arch: reclaim a few bytes from the end of our init section	18 years ago
cris	typo fixes	18 years ago
frv	FRV: Remove the section annotation on free_initmem()	18 years ago
h8300	Kbuild/doc: fix links to Documentation files	18 years ago
ia64	[IA64] IOSAPIC bogus error cleanup	18 years ago
m32r	spelling fixes: arch/m32r/	18 years ago
m68k	m68k: sg fallout	18 years ago
m68knommu	m68knommu: mark mem init functions as __init	18 years ago
mips	Use i8253.c lock for PC speaker on MIPS, too.	18 years ago
parisc	parisc: fix sg_page() fallout	18 years ago
powerpc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched	18 years ago
ppc	Merge branch 'for-2.6.24' of master.kernel.org:/pub/scm/linux/kernel/git/jwboyer/powerpc-4xx into merge	18 years ago
s390	sched: restore deterministic CPU accounting on powerpc	18 years ago
sh	Merge branch 'page_colouring_despair'	18 years ago
sh64	sh64: Kill off duplicate includes.	18 years ago
sparc	[SPARC]: Remove duplicate includes.	18 years ago
sparc64	[SPARC]: Remove duplicate includes.	18 years ago
um	UML: fix defconfig build again	18 years ago
v850	spelling fixes: arch/v850/	18 years ago
x86	x86 - 32-bit ptrace emulation mishandles 6th arg	18 years ago
xtensa	Kbuild/doc: fix links to Documentation files	18 years ago