forked from Minki/linux
7a3f5134a8
Any user on existing parisc 32- and 64bit-kernels can easily crash
the kernel and as such enforce a DSO.
A simple testcase is available here:
http://gsyprf10.external.hp.com/~deller/crash.tgz
The problem is introduced by the fact, that the handle_interruption()
crash handler calls the show_regs() function, which in turn tries to
unwind the stack by calling parisc_show_stack(). Since the stack contains
userspace addresses, a try to unwind the stack is dangerous and useless
and leads to the crash.
The fix is trivial: For userspace processes
a) avoid to unwind the stack, and
b) avoid to resolve userspace addresses to kernel symbol names.
While touching this code, I converted print_symbol() to %pS
printk formats and made parisc_show_stack() static.
An initial patch for this was written by Kyle McMartin back in August:
http://marc.info/?l=linux-parisc&m=121805168830283&w=2
Compile and run-tested with a 64bit parisc kernel.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Grant Grundler <grundler@parisc-linux.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: <stable@kernel.org> [2.6.25.x, 2.6.26.x, 2.6.27.x, earlier...]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
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| .. | ||
| .gitignore | ||
| asm-offsets.c | ||
| binfmt_elf32.c | ||
| cache.c | ||
| drivers.c | ||
| entry.S | ||
| firmware.c | ||
| hardware.c | ||
| head.S | ||
| hpmc.S | ||
| init_task.c | ||
| inventory.c | ||
| irq.c | ||
| Makefile | ||
| module.c | ||
| pa7300lc.c | ||
| pacache.S | ||
| parisc_ksyms.c | ||
| pci-dma.c | ||
| pci.c | ||
| pdc_chassis.c | ||
| pdc_cons.c | ||
| perf_asm.S | ||
| perf_images.h | ||
| perf.c | ||
| process.c | ||
| processor.c | ||
| ptrace.c | ||
| real2.S | ||
| setup.c | ||
| signal32.c | ||
| signal32.h | ||
| signal.c | ||
| smp.c | ||
| sys32.h | ||
| sys_parisc32.c | ||
| sys_parisc.c | ||
| syscall_table.S | ||
| syscall.S | ||
| time.c | ||
| topology.c | ||
| traps.c | ||
| unaligned.c | ||
| unwind.c | ||
| vmlinux.lds.S | ||