lkml.org 
[lkml]   [2022]   [Jul]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH bpf-next v6 03/23] bpf/verifier: do not clear meta in check_mem_size
Date
The purpose of this clear is to prevent meta->raw_mode to be evaluated
at true, but this also prevents to forward any other data to the other
callees.

Only switch back raw_mode to false so we don't entirely clear meta.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

---

new in v6
---
kernel/bpf/verifier.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index f6af57a84247..3adcc0d123af 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5277,7 +5277,7 @@ static int check_mem_size_reg(struct bpf_verifier_env *env,
* initialize all the memory that the helper could
* just partially fill up.
*/
- meta = NULL;
+ meta->raw_mode = false;

if (reg->smin_value < 0) {
verbose(env, "R%d min value is negative, either use unsigned or 'var &= const'\n",
--
2.36.1
\
 
 \ /
  Last update: 2022-07-12 17:00    [W:0.329 / U:0.600 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site