diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2018-05-18 18:27:39 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-06-21 17:11:02 +0200 |
| commit | 90718e32e1dcc2479acfa208ccfc6442850b594c (patch) | |
| tree | dd662e5d1d39c6909e1ebe033bc2fa3e2018350b | |
| parent | a89d0c2acff952935cb37d501eaa702db5a63a05 (diff) | |
| download | linux-90718e32e1dcc2479acfa208ccfc6442850b594c.tar.bz2 | |
uprobes/x86: Remove incorrect WARN_ON() in uprobe_init_insn()
insn_get_length() has the side-effect of processing the entire instruction
but only if it was decoded successfully, otherwise insn_complete() can fail
and in this case we need to just return an error without warning.
Reported-by: syzbot+30d675e3ca03c1c351e7@syzkaller.appspotmail.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: syzkaller-bugs@googlegroups.com
Link: https://lkml.kernel.org/lkml/20180518162739.GA5559@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/kernel/uprobes.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c index 58d8d800875d..deb576b23b7c 100644 --- a/arch/x86/kernel/uprobes.c +++ b/arch/x86/kernel/uprobes.c @@ -293,7 +293,7 @@ static int uprobe_init_insn(struct arch_uprobe *auprobe, struct insn *insn, bool insn_init(insn, auprobe->insn, sizeof(auprobe->insn), x86_64); /* has the side-effect of processing the entire instruction */ insn_get_length(insn); - if (WARN_ON_ONCE(!insn_complete(insn))) + if (!insn_complete(insn)) return -ENOEXEC; if (is_prefix_bad(insn)) |