When CONFIG_KASAN is enabled, the "--param asan-stack=1" causes rather large stack frames in some functions. This goes unnoticed normally because CONFIG_FRAME_WARN is disabled with CONFIG_KASAN by default as of commit 3f181b4d8652 ("lib/Kconfig.debug: disable -Wframe-larger-than warnings with KASAN=y").
The kernelci.org build bot however has the warning enabled and that led me to investigate it a little further, as every build produces these warnings:
net/wireless/nl80211.c:4389:1: warning: the frame size of 2240 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/wireless/nl80211.c:1895:1: warning: the frame size of 3776 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/wireless/nl80211.c:1410:1: warning: the frame size of 2208 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/bridge/br_netlink.c:1282:1: warning: the frame size of 2544 bytes is larger than 2048 bytes [-Wframe-larger-than=]
With the new noinline_for_kasan annotation, we can avoid the problem when KASAN is enabled but not change anything otherwise.
Cc: Andrey Ryabinin aryabinin@virtuozzo.com Cc: Alexander Potapenko glider@google.com Cc: Dmitry Vyukov dvyukov@google.com Cc: kasan-dev@googlegroups.com Signed-off-by: Arnd Bergmann arnd@arndb.de --- include/net/netlink.h | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-)
diff --git a/include/net/netlink.h b/include/net/netlink.h index b239fcd33d80..d84878d8347f 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -755,7 +755,7 @@ static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) +static noinline_for_kasan int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) { return nla_put(skb, attrtype, sizeof(u8), &value); } @@ -766,7 +766,7 @@ static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) +static noinline_for_kasan int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) { return nla_put(skb, attrtype, sizeof(u16), &value); } @@ -777,7 +777,7 @@ static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) +static noinline_for_kasan int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) { return nla_put(skb, attrtype, sizeof(__be16), &value); } @@ -788,7 +788,7 @@ static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) +static noinline_for_kasan int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) { return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, value); } @@ -799,7 +799,7 @@ static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) +static noinline_for_kasan int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) { return nla_put(skb, attrtype, sizeof(__le16), &value); } @@ -810,7 +810,7 @@ static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) +static noinline_for_kasan int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) { return nla_put(skb, attrtype, sizeof(u32), &value); } @@ -821,7 +821,7 @@ static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) +static noinline_for_kasan int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) { return nla_put(skb, attrtype, sizeof(__be32), &value); } @@ -832,7 +832,7 @@ static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) +static noinline_for_kasan int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) { return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, value); } @@ -843,7 +843,7 @@ static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) +static noinline_for_kasan int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) { return nla_put(skb, attrtype, sizeof(__le32), &value); } @@ -855,7 +855,7 @@ static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) * @value: numeric value * @padattr: attribute type for the padding */ -static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, +static noinline_for_kasan int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, u64 value, int padattr) { return nla_put_64bit(skb, attrtype, sizeof(u64), &value, padattr); @@ -868,7 +868,7 @@ static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, * @value: numeric value * @padattr: attribute type for the padding */ -static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, +static noinline_for_kasan int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, int padattr) { return nla_put_64bit(skb, attrtype, sizeof(__be64), &value, padattr); @@ -881,7 +881,7 @@ static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, * @value: numeric value * @padattr: attribute type for the padding */ -static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, +static noinline_for_kasan int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, int padattr) { return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, value, @@ -895,7 +895,7 @@ static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, * @value: numeric value * @padattr: attribute type for the padding */ -static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, +static noinline_for_kasan int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, int padattr) { return nla_put_64bit(skb, attrtype, sizeof(__le64), &value, padattr); @@ -907,7 +907,7 @@ static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) +static noinline_for_kasan int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) { return nla_put(skb, attrtype, sizeof(s8), &value); } @@ -918,7 +918,7 @@ static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) +static noinline_for_kasan int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) { return nla_put(skb, attrtype, sizeof(s16), &value); } @@ -929,7 +929,7 @@ static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) * @attrtype: attribute type * @value: numeric value */ -static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) +static noinline_for_kasan int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) { return nla_put(skb, attrtype, sizeof(s32), &value); } @@ -941,7 +941,7 @@ static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) * @value: numeric value * @padattr: attribute type for the padding */ -static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, +static noinline_for_kasan int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, int padattr) { return nla_put_64bit(skb, attrtype, sizeof(s64), &value, padattr); @@ -976,7 +976,7 @@ static inline int nla_put_flag(struct sk_buff *skb, int attrtype) * @njiffies: number of jiffies to convert to msecs * @padattr: attribute type for the padding */ -static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, +static noinline_for_kasan int nla_put_msecs(struct sk_buff *skb, int attrtype, unsigned long njiffies, int padattr) { u64 tmp = jiffies_to_msecs(njiffies);