From: Mauro Carvalho Chehab <mchehab@s-opensource.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
kasan-dev@googlegroups.com, Dmitry Vyukov <dvyukov@google.com>,
Alexander Potapenko <glider@google.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Arend van Spriel <arend.vanspriel@broadcom.com>,
Abylay Ospan <aospan@netup.ru>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-media@vger.kernel.org
Subject: Re: [PATCH v2 06/11] dvb-frontends: reduce stack size in i2c access
Date: Sat, 24 Jun 2017 16:49:33 -0300 [thread overview]
Message-ID: <20170624164933.7ff1dd68@vento.lan> (raw)
In-Reply-To: <20170614211556.2062728-7-arnd@arndb.de>
Em Wed, 14 Jun 2017 23:15:41 +0200
Arnd Bergmann <arnd@arndb.de> escreveu:
> A typical code fragment was copied across many dvb-frontend
> drivers and causes large stack frames when built with
> -fsanitize-address-use-after-scope, e.g.
>
> drivers/media/dvb-frontends/cxd2841er.c:3225:1: error: the frame size of 3992 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]
> drivers/media/dvb-frontends/cxd2841er.c:3404:1: error: the frame size of 3136 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]
> drivers/media/dvb-frontends/stv0367.c:3143:1: error: the frame size of 4016 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]
> drivers/media/dvb-frontends/stv090x.c:3430:1: error: the frame size of 5312 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]
> drivers/media/dvb-frontends/stv090x.c:4248:1: error: the frame size of 4872 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]
>
> By marking the register access functions as noinline_if_stackbloat,
> we can completely avoid this problem.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Feel free to add my ack to patches 6 and 7 of this series:
Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
> ---
> drivers/media/dvb-frontends/ascot2e.c | 3 ++-
> drivers/media/dvb-frontends/cxd2841er.c | 4 ++--
> drivers/media/dvb-frontends/drx39xyj/drxj.c | 14 +++++++-------
> drivers/media/dvb-frontends/helene.c | 4 ++--
> drivers/media/dvb-frontends/horus3a.c | 2 +-
> drivers/media/dvb-frontends/itd1000.c | 2 +-
> drivers/media/dvb-frontends/mt312.c | 2 +-
> drivers/media/dvb-frontends/si2165.c | 14 +++++++-------
> drivers/media/dvb-frontends/stb0899_drv.c | 2 +-
> drivers/media/dvb-frontends/stb6100.c | 2 +-
> drivers/media/dvb-frontends/stv0367.c | 2 +-
> drivers/media/dvb-frontends/stv090x.c | 2 +-
> drivers/media/dvb-frontends/stv6110.c | 2 +-
> drivers/media/dvb-frontends/stv6110x.c | 2 +-
> drivers/media/dvb-frontends/tda8083.c | 2 +-
> drivers/media/dvb-frontends/zl10039.c | 2 +-
> 16 files changed, 31 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/media/dvb-frontends/ascot2e.c b/drivers/media/dvb-frontends/ascot2e.c
> index 0ee0df53b91b..da1d1fc03c5e 100644
> --- a/drivers/media/dvb-frontends/ascot2e.c
> +++ b/drivers/media/dvb-frontends/ascot2e.c
> @@ -153,7 +153,8 @@ static int ascot2e_write_regs(struct ascot2e_priv *priv,
> return 0;
> }
>
> -static int ascot2e_write_reg(struct ascot2e_priv *priv, u8 reg, u8 val)
> +static noinline_if_stackbloat int ascot2e_write_reg(struct ascot2e_priv *priv,
> + u8 reg, u8 val)
> {
> return ascot2e_write_regs(priv, reg, &val, 1);
> }
> diff --git a/drivers/media/dvb-frontends/cxd2841er.c b/drivers/media/dvb-frontends/cxd2841er.c
> index ce37dc2e89c7..6b851a948ce0 100644
> --- a/drivers/media/dvb-frontends/cxd2841er.c
> +++ b/drivers/media/dvb-frontends/cxd2841er.c
> @@ -258,7 +258,7 @@ static int cxd2841er_write_regs(struct cxd2841er_priv *priv,
> return 0;
> }
>
> -static int cxd2841er_write_reg(struct cxd2841er_priv *priv,
> +static noinline_if_stackbloat int cxd2841er_write_reg(struct cxd2841er_priv *priv,
> u8 addr, u8 reg, u8 val)
> {
> return cxd2841er_write_regs(priv, addr, reg, &val, 1);
> @@ -306,7 +306,7 @@ static int cxd2841er_read_regs(struct cxd2841er_priv *priv,
> return 0;
> }
>
> -static int cxd2841er_read_reg(struct cxd2841er_priv *priv,
> +static noinline_if_stackbloat int cxd2841er_read_reg(struct cxd2841er_priv *priv,
> u8 addr, u8 reg, u8 *val)
> {
> return cxd2841er_read_regs(priv, addr, reg, val, 1);
> diff --git a/drivers/media/dvb-frontends/drx39xyj/drxj.c b/drivers/media/dvb-frontends/drx39xyj/drxj.c
> index 14040c915dbb..ec5b13ca630b 100644
> --- a/drivers/media/dvb-frontends/drx39xyj/drxj.c
> +++ b/drivers/media/dvb-frontends/drx39xyj/drxj.c
> @@ -1516,7 +1516,7 @@ static int drxdap_fasi_read_block(struct i2c_device_addr *dev_addr,
> *
> ******************************/
>
> -static int drxdap_fasi_read_reg16(struct i2c_device_addr *dev_addr,
> +static noinline_if_stackbloat int drxdap_fasi_read_reg16(struct i2c_device_addr *dev_addr,
> u32 addr,
> u16 *data, u32 flags)
> {
> @@ -1549,7 +1549,7 @@ static int drxdap_fasi_read_reg16(struct i2c_device_addr *dev_addr,
> *
> ******************************/
>
> -static int drxdap_fasi_read_reg32(struct i2c_device_addr *dev_addr,
> +static noinline_if_stackbloat int drxdap_fasi_read_reg32(struct i2c_device_addr *dev_addr,
> u32 addr,
> u32 *data, u32 flags)
> {
> @@ -1722,7 +1722,7 @@ static int drxdap_fasi_write_block(struct i2c_device_addr *dev_addr,
> *
> ******************************/
>
> -static int drxdap_fasi_write_reg16(struct i2c_device_addr *dev_addr,
> +static noinline_if_stackbloat int drxdap_fasi_write_reg16(struct i2c_device_addr *dev_addr,
> u32 addr,
> u16 data, u32 flags)
> {
> @@ -1795,7 +1795,7 @@ static int drxdap_fasi_read_modify_write_reg16(struct i2c_device_addr *dev_addr,
> *
> ******************************/
>
> -static int drxdap_fasi_write_reg32(struct i2c_device_addr *dev_addr,
> +static noinline_if_stackbloat int drxdap_fasi_write_reg32(struct i2c_device_addr *dev_addr,
> u32 addr,
> u32 data, u32 flags)
> {
> @@ -2172,7 +2172,7 @@ int drxj_dap_atomic_read_write_block(struct i2c_device_addr *dev_addr,
> * \fn int drxj_dap_atomic_read_reg32()
> * \brief Atomic read of 32 bits words
> */
> -static
> +static noinline_if_stackbloat
> int drxj_dap_atomic_read_reg32(struct i2c_device_addr *dev_addr,
> u32 addr,
> u32 *data, u32 flags)
> @@ -4192,7 +4192,7 @@ int drxj_dap_scu_atomic_read_write_block(struct i2c_device_addr *dev_addr, u32 a
> * \fn int DRXJ_DAP_AtomicReadReg16()
> * \brief Atomic read of 16 bits words
> */
> -static
> +static noinline_if_stackbloat
> int drxj_dap_scu_atomic_read_reg16(struct i2c_device_addr *dev_addr,
> u32 addr,
> u16 *data, u32 flags)
> @@ -4220,7 +4220,7 @@ int drxj_dap_scu_atomic_read_reg16(struct i2c_device_addr *dev_addr,
> * \fn int drxj_dap_scu_atomic_write_reg16()
> * \brief Atomic read of 16 bits words
> */
> -static
> +static noinline_if_stackbloat
> int drxj_dap_scu_atomic_write_reg16(struct i2c_device_addr *dev_addr,
> u32 addr,
> u16 data, u32 flags)
> diff --git a/drivers/media/dvb-frontends/helene.c b/drivers/media/dvb-frontends/helene.c
> index 4bf5a551ba40..849a18a837d0 100644
> --- a/drivers/media/dvb-frontends/helene.c
> +++ b/drivers/media/dvb-frontends/helene.c
> @@ -329,7 +329,7 @@ static int helene_write_regs(struct helene_priv *priv,
> return 0;
> }
>
> -static int helene_write_reg(struct helene_priv *priv, u8 reg, u8 val)
> +static noinline_if_stackbloat int helene_write_reg(struct helene_priv *priv, u8 reg, u8 val)
> {
> return helene_write_regs(priv, reg, &val, 1);
> }
> @@ -374,7 +374,7 @@ static int helene_read_regs(struct helene_priv *priv,
> return 0;
> }
>
> -static int helene_read_reg(struct helene_priv *priv, u8 reg, u8 *val)
> +static noinline_if_stackbloat int helene_read_reg(struct helene_priv *priv, u8 reg, u8 *val)
> {
> return helene_read_regs(priv, reg, val, 1);
> }
> diff --git a/drivers/media/dvb-frontends/horus3a.c b/drivers/media/dvb-frontends/horus3a.c
> index 68d759c4c52e..f879af6c3188 100644
> --- a/drivers/media/dvb-frontends/horus3a.c
> +++ b/drivers/media/dvb-frontends/horus3a.c
> @@ -87,7 +87,7 @@ static int horus3a_write_regs(struct horus3a_priv *priv,
> return 0;
> }
>
> -static int horus3a_write_reg(struct horus3a_priv *priv, u8 reg, u8 val)
> +static noinline_if_stackbloat int horus3a_write_reg(struct horus3a_priv *priv, u8 reg, u8 val)
> {
> return horus3a_write_regs(priv, reg, &val, 1);
> }
> diff --git a/drivers/media/dvb-frontends/itd1000.c b/drivers/media/dvb-frontends/itd1000.c
> index 5bb1e73a10b4..8bd6d04362cc 100644
> --- a/drivers/media/dvb-frontends/itd1000.c
> +++ b/drivers/media/dvb-frontends/itd1000.c
> @@ -93,7 +93,7 @@ static int itd1000_read_reg(struct itd1000_state *state, u8 reg)
> return val;
> }
>
> -static inline int itd1000_write_reg(struct itd1000_state *state, u8 r, u8 v)
> +static noinline_if_stackbloat int itd1000_write_reg(struct itd1000_state *state, u8 r, u8 v)
> {
> int ret = itd1000_write_regs(state, r, &v, 1);
> state->shadow[r] = v;
> diff --git a/drivers/media/dvb-frontends/mt312.c b/drivers/media/dvb-frontends/mt312.c
> index 961b9a2508e0..d7a701da598a 100644
> --- a/drivers/media/dvb-frontends/mt312.c
> +++ b/drivers/media/dvb-frontends/mt312.c
> @@ -139,7 +139,7 @@ static inline int mt312_readreg(struct mt312_state *state,
> return mt312_read(state, reg, val, 1);
> }
>
> -static inline int mt312_writereg(struct mt312_state *state,
> +static noinline_if_stackbloat int mt312_writereg(struct mt312_state *state,
> const enum mt312_reg_addr reg, const u8 val)
> {
> return mt312_write(state, reg, &val, 1);
> diff --git a/drivers/media/dvb-frontends/si2165.c b/drivers/media/dvb-frontends/si2165.c
> index 528b82a5dd46..8b1ac134f9d8 100644
> --- a/drivers/media/dvb-frontends/si2165.c
> +++ b/drivers/media/dvb-frontends/si2165.c
> @@ -140,7 +140,7 @@ static int si2165_read(struct si2165_state *state,
> return 0;
> }
>
> -static int si2165_readreg8(struct si2165_state *state,
> +static noinline_if_stackbloat int si2165_readreg8(struct si2165_state *state,
> const u16 reg, u8 *val)
> {
> unsigned int val_tmp;
> @@ -150,7 +150,7 @@ static int si2165_readreg8(struct si2165_state *state,
> return ret;
> }
>
> -static int si2165_readreg16(struct si2165_state *state,
> +static noinline_if_stackbloat int si2165_readreg16(struct si2165_state *state,
> const u16 reg, u16 *val)
> {
> u8 buf[2];
> @@ -161,26 +161,26 @@ static int si2165_readreg16(struct si2165_state *state,
> return ret;
> }
>
> -static int si2165_writereg8(struct si2165_state *state, const u16 reg, u8 val)
> +static noinline_if_stackbloat int si2165_writereg8(struct si2165_state *state, const u16 reg, u8 val)
> {
> return regmap_write(state->regmap, reg, val);
> }
>
> -static int si2165_writereg16(struct si2165_state *state, const u16 reg, u16 val)
> +static noinline_if_stackbloat int si2165_writereg16(struct si2165_state *state, const u16 reg, u16 val)
> {
> u8 buf[2] = { val & 0xff, (val >> 8) & 0xff };
>
> return si2165_write(state, reg, buf, 2);
> }
>
> -static int si2165_writereg24(struct si2165_state *state, const u16 reg, u32 val)
> +static noinline_if_stackbloat int si2165_writereg24(struct si2165_state *state, const u16 reg, u32 val)
> {
> u8 buf[3] = { val & 0xff, (val >> 8) & 0xff, (val >> 16) & 0xff };
>
> return si2165_write(state, reg, buf, 3);
> }
>
> -static int si2165_writereg32(struct si2165_state *state, const u16 reg, u32 val)
> +static noinline_if_stackbloat int si2165_writereg32(struct si2165_state *state, const u16 reg, u32 val)
> {
> u8 buf[4] = {
> val & 0xff,
> @@ -191,7 +191,7 @@ static int si2165_writereg32(struct si2165_state *state, const u16 reg, u32 val)
> return si2165_write(state, reg, buf, 4);
> }
>
> -static int si2165_writereg_mask8(struct si2165_state *state, const u16 reg,
> +static noinline_if_stackbloat int si2165_writereg_mask8(struct si2165_state *state, const u16 reg,
> u8 val, u8 mask)
> {
> if (mask != 0xff) {
> diff --git a/drivers/media/dvb-frontends/stb0899_drv.c b/drivers/media/dvb-frontends/stb0899_drv.c
> index 02347598277a..9258085b8d35 100644
> --- a/drivers/media/dvb-frontends/stb0899_drv.c
> +++ b/drivers/media/dvb-frontends/stb0899_drv.c
> @@ -537,7 +537,7 @@ int stb0899_write_regs(struct stb0899_state *state, unsigned int reg, u8 *data,
> return 0;
> }
>
> -int stb0899_write_reg(struct stb0899_state *state, unsigned int reg, u8 data)
> +noinline_if_stackbloat int stb0899_write_reg(struct stb0899_state *state, unsigned int reg, u8 data)
> {
> return stb0899_write_regs(state, reg, &data, 1);
> }
> diff --git a/drivers/media/dvb-frontends/stb6100.c b/drivers/media/dvb-frontends/stb6100.c
> index 17a955d0031b..675dffe1ef20 100644
> --- a/drivers/media/dvb-frontends/stb6100.c
> +++ b/drivers/media/dvb-frontends/stb6100.c
> @@ -224,7 +224,7 @@ static int stb6100_write_reg_range(struct stb6100_state *state, u8 buf[], int st
> return 0;
> }
>
> -static int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data)
> +static noinline_if_stackbloat int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data)
> {
> if (unlikely(reg >= STB6100_NUMREGS)) {
> dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
> diff --git a/drivers/media/dvb-frontends/stv0367.c b/drivers/media/dvb-frontends/stv0367.c
> index fd49c436a36d..2316c0bb3e21 100644
> --- a/drivers/media/dvb-frontends/stv0367.c
> +++ b/drivers/media/dvb-frontends/stv0367.c
> @@ -798,7 +798,7 @@ int stv0367_writeregs(struct stv0367_state *state, u16 reg, u8 *data, int len)
> return (ret != 1) ? -EREMOTEIO : 0;
> }
>
> -static int stv0367_writereg(struct stv0367_state *state, u16 reg, u8 data)
> +static noinline_if_stackbloat int stv0367_writereg(struct stv0367_state *state, u16 reg, u8 data)
> {
> return stv0367_writeregs(state, reg, &data, 1);
> }
> diff --git a/drivers/media/dvb-frontends/stv090x.c b/drivers/media/dvb-frontends/stv090x.c
> index 7ef469c0c866..8afecc2e3637 100644
> --- a/drivers/media/dvb-frontends/stv090x.c
> +++ b/drivers/media/dvb-frontends/stv090x.c
> @@ -753,7 +753,7 @@ static int stv090x_write_regs(struct stv090x_state *state, unsigned int reg, u8
> return 0;
> }
>
> -static int stv090x_write_reg(struct stv090x_state *state, unsigned int reg, u8 data)
> +static noinline_if_stackbloat int stv090x_write_reg(struct stv090x_state *state, unsigned int reg, u8 data)
> {
> return stv090x_write_regs(state, reg, &data, 1);
> }
> diff --git a/drivers/media/dvb-frontends/stv6110.c b/drivers/media/dvb-frontends/stv6110.c
> index e4fd9c1b0560..ddef3a912615 100644
> --- a/drivers/media/dvb-frontends/stv6110.c
> +++ b/drivers/media/dvb-frontends/stv6110.c
> @@ -137,7 +137,7 @@ static int stv6110_read_regs(struct dvb_frontend *fe, u8 regs[],
> return 0;
> }
>
> -static int stv6110_read_reg(struct dvb_frontend *fe, int start)
> +static noinline_if_stackbloat int stv6110_read_reg(struct dvb_frontend *fe, int start)
> {
> u8 buf[] = { 0 };
> stv6110_read_regs(fe, buf, start, 1);
> diff --git a/drivers/media/dvb-frontends/stv6110x.c b/drivers/media/dvb-frontends/stv6110x.c
> index 66eba38f1014..80c7024971de 100644
> --- a/drivers/media/dvb-frontends/stv6110x.c
> +++ b/drivers/media/dvb-frontends/stv6110x.c
> @@ -95,7 +95,7 @@ static int stv6110x_write_regs(struct stv6110x_state *stv6110x, int start, u8 da
> return 0;
> }
>
> -static int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
> +static noinline_if_stackbloat int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
> {
> return stv6110x_write_regs(stv6110x, reg, &data, 1);
> }
> diff --git a/drivers/media/dvb-frontends/tda8083.c b/drivers/media/dvb-frontends/tda8083.c
> index aa3200d3c352..646f22aab24e 100644
> --- a/drivers/media/dvb-frontends/tda8083.c
> +++ b/drivers/media/dvb-frontends/tda8083.c
> @@ -88,7 +88,7 @@ static int tda8083_readregs (struct tda8083_state* state, u8 reg1, u8 *b, u8 len
> return ret == 2 ? 0 : -1;
> }
>
> -static inline u8 tda8083_readreg (struct tda8083_state* state, u8 reg)
> +static noinline_if_stackbloat u8 tda8083_readreg (struct tda8083_state* state, u8 reg)
> {
> u8 val;
>
> diff --git a/drivers/media/dvb-frontends/zl10039.c b/drivers/media/dvb-frontends/zl10039.c
> index 623355fc2666..0075725cb161 100644
> --- a/drivers/media/dvb-frontends/zl10039.c
> +++ b/drivers/media/dvb-frontends/zl10039.c
> @@ -130,7 +130,7 @@ static inline int zl10039_readreg(struct zl10039_state *state,
> return zl10039_read(state, reg, val, 1);
> }
>
> -static inline int zl10039_writereg(struct zl10039_state *state,
> +static noinline_if_stackbloat int zl10039_writereg(struct zl10039_state *state,
> const enum zl10039_reg_addr reg,
> const u8 val)
> {
Thanks,
Mauro
next prev parent reply other threads:[~2017-06-24 19:49 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-14 21:15 [PATCH v2 00/11] bring back stack frame warning with KASAN Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 01/11] compiler: introduce noinline_if_stackbloat annotation Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 02/11] netlink: mark nla_put_{u8,u16,u32} noinline_if_stackbloat Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 03/11] tty: kbd: reduce stack size with KASAN Arnd Bergmann
2017-06-14 21:28 ` Samuel Thibault
2017-06-14 21:56 ` Arnd Bergmann
2017-06-14 22:16 ` Samuel Thibault
2017-06-15 4:52 ` Greg Kroah-Hartman
2017-06-15 4:53 ` Greg Kroah-Hartman
2017-06-16 12:01 ` Arnd Bergmann
2017-06-16 13:02 ` Greg Kroah-Hartman
2017-06-16 15:41 ` Arnd Bergmann
2017-06-16 15:58 ` Samuel Thibault
2017-06-16 17:29 ` Dmitry Torokhov
2017-06-16 20:56 ` Arnd Bergmann
2017-06-16 21:07 ` Dmitry Torokhov
2017-06-16 17:14 ` Andrey Ryabinin
2017-06-14 21:15 ` [PATCH v2 04/11] rocker: mark rocker_tlv_put_* functions as noinline_if_stackbloat Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 05/11] mtd: cfi: reduce stack size with KASAN Arnd Bergmann
2017-08-04 7:42 ` Boris Brezillon
2017-08-04 9:09 ` Arnd Bergmann
2017-08-04 10:56 ` Boris Brezillon
2017-08-04 10:57 ` Boris Brezillon
2017-06-14 21:15 ` [PATCH v2 06/11] dvb-frontends: reduce stack size in i2c access Arnd Bergmann
2017-06-24 19:49 ` Mauro Carvalho Chehab [this message]
2017-06-14 21:15 ` [PATCH v2 07/11] r820t: mark register functions as noinline_if_stackbloat Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 08/11] brcmsmac: make some local variables 'static const' to reduce stack size Arnd Bergmann
2017-06-15 14:56 ` Kalle Valo
2017-06-14 21:15 ` [PATCH v2 09/11] brcmsmac: split up wlc_phy_workarounds_nphy Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 10/11] brcmsmac: reindent split functions Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 11/11] kasan: rework Kconfig settings Arnd Bergmann
2017-06-15 7:02 ` Dmitry Vyukov
2017-06-16 11:42 ` Arnd Bergmann
2017-06-16 11:44 ` Dmitry Vyukov
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