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Revert "xfrm: fix a data-race in xfrm_gen_index()"

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This reverts commit 17c75411e2 which is
commit 3e4bc23926b83c3c67e5f61ae8571602754131a6 upstream.

It breaks the android ABI and if this is needed in the future, can be
brought back in an abi-safe way.

Bug: 161946584
Change-Id: I6af8ce540570c756ea9f16526c36f8815971e216
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman 2023-10-26 10:16:50 +00:00
parent b95e67a557
commit 1427d077a0
2 changed files with 4 additions and 3 deletions
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1
include/net/netns/xfrm.h
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@ -48,7 +48,6 @@ struct netns_xfrm {
struct list_head policy_all;
struct hlist_head *policy_byidx;
unsigned int policy_idx_hmask;
unsigned int idx_generator;
struct hlist_head policy_inexact[XFRM_POLICY_MAX];
struct xfrm_policy_hash policy_bydst[XFRM_POLICY_MAX];
unsigned int policy_count[XFRM_POLICY_MAX * 2];

6
net/xfrm/xfrm_policy.c
View file

@ -654,6 +654,8 @@ EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
* of an absolute inpredictability of ordering of rules. This will not pass. */
static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
{
static u32 idx_generator;
for (;;) {
struct hlist_head *list;
struct xfrm_policy *p;
@ -661,8 +663,8 @@ static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
int found;
if (!index) {
idx = (net->xfrm.idx_generator | dir);
net->xfrm.idx_generator += 8;
idx = (idx_generator | dir);
idx_generator += 8;
} else {
idx = index;
index = 0;