In setsockopt(SO_MAX_PACING_RATE) on 64bit systems, sk_max_pacing_rate,
after extended from 'u32' to 'unsigned long', takes unintentionally
hiked value whenever assigned from an 'int' value with MSB=1, due to
binary sign extension in promoting s32 to u64, e.g. 0x80000000 becomes
0xFFFFFFFF80000000.
Thus inflated sk_max_pacing_rate causes subsequent getsockopt to return
~0U unexpectedly. It may also result in increased pacing rate.
Fix by explicitly casting the 'int' value to 'unsigned int' before
assigning it to sk_max_pacing_rate, for zero extension to happen.
Fixes: 76a9ebe811fb ("net: extend sk_pacing_rate to unsigned long")
Signed-off-by: Ji Li <j...@akamai.com>
Signed-off-by: Ke Li <k...@akamai.com>
Cc: Eric Dumazet <eduma...@google.com>
---
v2: wrap the line in net/core/filter.c to less than 80 chars.
net/core/filter.c | 3 ++-
net/core/sock.c | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/core/filter.c b/net/core/filter.c
index c5e2a1c5fd8d..9370cd917fb9 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4693,7 +4693,8 @@ static int _bpf_setsockopt(struct sock *sk, int level,
int optname,
cmpxchg(&sk->sk_pacing_status,
SK_PACING_NONE,
SK_PACING_NEEDED);
- sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val;
+ sk->sk_max_pacing_rate = (val == ~0U) ?
+ ~0UL : (unsigned int)val;
sk->sk_pacing_rate = min(sk->sk_pacing_rate,
sk->sk_max_pacing_rate);
break;
diff --git a/net/core/sock.c b/net/core/sock.c
index 4e8729357122..727ea1cc633c 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1163,7 +1163,7 @@ int sock_setsockopt(struct socket *sock, int level, int
optname,
case SO_MAX_PACING_RATE:
{
- unsigned long ulval = (val == ~0U) ? ~0UL : val;
+ unsigned long ulval = (val == ~0U) ? ~0UL : (unsigned int)val;
if (sizeof(ulval) != sizeof(val) &&
optlen >= sizeof(ulval) &&
base-commit: 287d35405989cfe0090e3059f7788dc531879a8d
--
2.17.1
