Messages in this thread Patch in this message | | | Date | Thu, 14 Jan 2010 14:46:39 -0800 | From | Greg KH <> | Subject | [3/9] kernel/signal.c: fix kernel information leak with print-fatal-signals=1 |
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2.6.31-stable review patch. If anyone has any objections, please let us know.
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From: Andi Kleen <andi@firstfloor.org>
commit b45c6e76bc2c72f6426c14bed64fdcbc9bf37cb0 upstream.
When print-fatal-signals is enabled it's possible to dump any memory reachable by the kernel to the log by simply jumping to that address from user space.
Or crash the system if there's some hardware with read side effects.
The fatal signals handler will dump 16 bytes at the execution address, which is fully controlled by ring 3.
In addition when something jumps to a unmapped address there will be up to 16 additional useless page faults, which might be potentially slow (and at least is not very efficient)
Fortunately this option is off by default and only there on i386.
But fix it by checking for kernel addresses and also stopping when there's a page fault.
Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- kernel/signal.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/signal.c +++ b/kernel/signal.c @@ -939,7 +939,8 @@ static void print_fatal_signal(struct pt for (i = 0; i < 16; i++) { unsigned char insn; - __get_user(insn, (unsigned char *)(regs->ip + i)); + if (get_user(insn, (unsigned char *)(regs->ip + i))) + break; printk("%02x ", insn); } }
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