Oleg Nesterov 75ed82ea53 uprobes: Change write_opcode() to use FOLL_FORCE ... write_opcode()->get_user_pages() needs FOLL_FORCE to ensure we can read the page even if the probed task did mprotect(PROT_NONE) after uprobe_register(). Without FOLL_WRITE, FOLL_FORCE doesn't have any side effect but allows to read the !VM_READ memory. Otherwiese the subsequent uprobe_unregister()->set_orig_insn() fails and we leak "int3". If that task does mprotect(PROT_READ | EXEC) and execute the probed insn later it will be killed. Note: in fact this is also needed for _register, see the next patch. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>		2012-09-29 21:21:53 +02:00
..
callchain.c	perf: Add attribute to filter out callchains	2012-08-10 12:40:57 -03:00
core.c	perf: Add ability to attach user stack dump to sample	2012-08-10 12:17:58 -03:00
hw_breakpoint.c	Merge branch 'x86/cleanups' into perf/uprobes	2012-03-13 16:33:03 +01:00
internal.h	perf: Add ability to attach user stack dump to sample	2012-08-10 12:17:58 -03:00
Makefile	uprobes: Move to kernel/events/	2012-02-22 11:08:00 +01:00
ring_buffer.c	perf: Add perf_output_skip function to skip bytes in sample	2012-08-10 12:16:22 -03:00
uprobes.c	uprobes: Change write_opcode() to use FOLL_FORCE	2012-09-29 21:21:53 +02:00