path: root/kernel/events/uprobes.c
diff options
authorOleg Nesterov <>2012-09-16 17:20:06 +0200
committerAnton Arapov <>2012-10-29 11:50:13 +0100
commit9251477d8c2aaa36b0b835d9c15ece0fe8320657 (patch)
tree4bf24cf66977113d37dac9258f454ccb4b969eb8 /kernel/events/uprobes.c
parent8a661b7d1772c6caf07016c42e815e556f09fc38 (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 <> Acked-by: Srikar Dronamraju <>
Diffstat (limited to 'kernel/events/uprobes.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 198d732ab90..80e8c7b697b 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,
/* 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;