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authorNathan Chancellor <nathan@kernel.org>2022-11-02 19:02:33 +0300
committerSebastian Reichel <sebastian.reichel@collabora.com>2022-11-14 23:43:37 +0300
commit913a144164d8f09fab7e4175d693168b29d5843b (patch)
tree1e99da75c4c62de14978dfdb880f3cb4b7089206
parent9abf2313adc1ca1b6180c508c25f22f9395cc780 (diff)
downloadlinux-913a144164d8f09fab7e4175d693168b29d5843b.tar.xz
HSI: ssi_protocol: Fix return type of ssip_pn_xmit()
With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. A proposed warning in clang aims to catch these at compile time, which reveals: drivers/hsi/clients/ssi_protocol.c:1053:20: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict] .ndo_start_xmit = ssip_pn_xmit, ^~~~~~~~~~~~ 1 error generated. ->ndo_start_xmit() in 'struct net_device_ops' expects a return type of 'netdev_tx_t', not 'int'. Adjust the return type of ssip_pn_xmit() to match the prototype's to resolve the warning and CFI failure. Additionally, use the enum 'NETDEV_TX_OK' instead of a raw '0' for the return value of ssip_pn_xmit(). Link: https://github.com/ClangBuiltLinux/linux/issues/1750 Signed-off-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
-rw-r--r--drivers/hsi/clients/ssi_protocol.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hsi/clients/ssi_protocol.c b/drivers/hsi/clients/ssi_protocol.c
index 274ad8443f8c..38e572faff43 100644
--- a/drivers/hsi/clients/ssi_protocol.c
+++ b/drivers/hsi/clients/ssi_protocol.c
@@ -968,7 +968,7 @@ static void ssip_xmit_work(struct work_struct *work)
ssip_xmit(cl);
}
-static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct hsi_client *cl = to_hsi_client(dev->dev.parent);
struct ssi_protocol *ssi = hsi_client_drvdata(cl);
@@ -1027,7 +1027,7 @@ static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev)
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
- return 0;
+ return NETDEV_TX_OK;
drop2:
hsi_free_msg(msg);
drop:
@@ -1035,7 +1035,7 @@ drop:
inc_dropped:
dev->stats.tx_dropped++;
- return 0;
+ return NETDEV_TX_OK;
}
/* CMT reset event handler */