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authorOleg Nesterov <oleg@redhat.com>2012-09-16 17:20:06 +0200
committerOleg Nesterov <oleg@redhat.com>2012-09-29 21:21:53 +0200
commit75ed82ea53bd0d2d8083261123576250f7ba851e (patch)
treeda2c69d053b7555c15e1adb5e6d901c2afab8ad8 /kernel/events
parentdb023ea595015058270be6a62fe60a7b6b5c50d7 (diff)
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>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/uprobes.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 198d732ab901..80e8c7b697b9 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -221,7 +221,7 @@ static int write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm,
retry:
/* Read the page with vaddr into memory */
- ret = get_user_pages(NULL, mm, vaddr, 1, 0, 0, &old_page, &vma);
+ ret = get_user_pages(NULL, mm, vaddr, 1, 0, 1, &old_page, &vma);
if (ret <= 0)
return ret;