[PATCH 4.20 010/145] net: core: Fix Spectre v1 vulnerability

From: Greg Kroah-Hartman
Date: Mon Jan 07 2019 - 07:37:25 EST

4.20-stable review patch. If anyone has any objections, please let me know.


From: "Gustavo A. R. Silva" <gustavo@xxxxxxxxxxxxxx>

[ Upstream commit 50d5258634aee2e62832aa086d2fb0de00e72b91 ]

flen is indirectly controlled by user-space, hence leading to
a potential exploitation of the Spectre variant 1 vulnerability.

This issue was detected with the help of Smatch:

net/core/filter.c:1101 bpf_check_classic() warn: potential spectre issue 'filter' [w]

Fix this by sanitizing flen before using it to index filter at line 1101:

switch (filter[flen - 1].code) {

and through pc at line 1040:

const struct sock_filter *ftest = &filter[pc];

Notice that given that speculation windows are large, the policy is
to kill the speculation on the first load and not worry if it can be
completed with a dependent load/store [1].

[1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2

Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/core/filter.c | 2 ++
1 file changed, 2 insertions(+)

--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -73,6 +73,7 @@
#include <linux/seg6_local.h>
#include <net/seg6.h>
#include <net/seg6_local.h>
+#include <linux/nospec.h>

* sk_filter_trim_cap - run a packet through a socket filter
@@ -1038,6 +1039,7 @@ static int bpf_check_classic(const struc
bool anc_found;
int pc;

+ flen = array_index_nospec(flen, BPF_MAXINSNS + 1);
/* Check the filter code now */
for (pc = 0; pc < flen; pc++) {
const struct sock_filter *ftest = &filter[pc];