From: Jiri Slaby jslaby@suse.cz
stable inclusion from stable-v5.10.134 commit 6a81848252869d929354a879e08807c932444929 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5A5Y1 CVE: CVE-2022-1462
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
commit 5f6a85158ccacc3f09744b3aafe8b11ab3b6c6f6 upstream.
Since commit a9c3f68f3cd8d (tty: Fix low_latency BUG) in 2014, tty_flip_buffer_push() is only a wrapper to tty_schedule_flip(). We are going to remove the latter (as it is used less), so call the former in drivers/tty/.
Cc: Vladimir Zapolskiy vz@mleia.com Reviewed-by: Johan Hovold johan@kernel.org Signed-off-by: Jiri Slaby jslaby@suse.cz Link: https://lore.kernel.org/r/20211122111648.30379-2-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yi Yang yiyang13@huawei.com Reviewed-by: Wang Weiyang wangweiyang2@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/tty/cyclades.c | 6 +++--- drivers/tty/goldfish.c | 2 +- drivers/tty/moxa.c | 4 ++-- drivers/tty/serial/lpc32xx_hs.c | 2 +- drivers/tty/vt/keyboard.c | 6 +++--- drivers/tty/vt/vt.c | 2 +- 6 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/drivers/tty/cyclades.c b/drivers/tty/cyclades.c index 097266342e5e..4bcaab250676 100644 --- a/drivers/tty/cyclades.c +++ b/drivers/tty/cyclades.c @@ -556,7 +556,7 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip, } info->idle_stats.recv_idle = jiffies; } - tty_schedule_flip(port); + tty_flip_buffer_push(port);
/* end of service */ cyy_writeb(info, CyRIR, save_xir & 0x3f); @@ -996,7 +996,7 @@ static void cyz_handle_rx(struct cyclades_port *info) mod_timer(&info->rx_full_timer, jiffies + 1); #endif info->idle_stats.recv_idle = jiffies; - tty_schedule_flip(&info->port); + tty_flip_buffer_push(&info->port);
/* Update rx_get */ cy_writel(&buf_ctrl->rx_get, new_rx_get); @@ -1172,7 +1172,7 @@ static void cyz_handle_cmd(struct cyclades_card *cinfo) if (delta_count) wake_up_interruptible(&info->port.delta_msr_wait); if (special_count) - tty_schedule_flip(&info->port); + tty_flip_buffer_push(&info->port); } }
diff --git a/drivers/tty/goldfish.c b/drivers/tty/goldfish.c index c8c5cdfc5e19..ed0f3a7b8fe5 100644 --- a/drivers/tty/goldfish.c +++ b/drivers/tty/goldfish.c @@ -151,7 +151,7 @@ static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id) address = (unsigned long)(void *)buf; goldfish_tty_rw(qtty, address, count, 0);
- tty_schedule_flip(&qtty->port); + tty_flip_buffer_push(&qtty->port); return IRQ_HANDLED; }
diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c index f9f14104bd2c..d6528f3bb9b9 100644 --- a/drivers/tty/moxa.c +++ b/drivers/tty/moxa.c @@ -1385,7 +1385,7 @@ static int moxa_poll_port(struct moxa_port *p, unsigned int handle, if (inited && !tty_throttled(tty) && MoxaPortRxQueue(p) > 0) { /* RX */ MoxaPortReadData(p); - tty_schedule_flip(&p->port); + tty_flip_buffer_push(&p->port); } } else { clear_bit(EMPTYWAIT, &p->statusflags); @@ -1410,7 +1410,7 @@ static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */ tty_insert_flip_char(&p->port, 0, TTY_BREAK); - tty_schedule_flip(&p->port); + tty_flip_buffer_push(&p->port); }
if (intr & IntrLine) diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c index b5898c932036..a9802308ff60 100644 --- a/drivers/tty/serial/lpc32xx_hs.c +++ b/drivers/tty/serial/lpc32xx_hs.c @@ -344,7 +344,7 @@ static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id) LPC32XX_HSUART_IIR(port->membase)); port->icount.overrun++; tty_insert_flip_char(tport, 0, TTY_OVERRUN); - tty_schedule_flip(tport); + tty_flip_buffer_push(tport); }
/* Data received? */ diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c index 78acc270e39a..aa0026a9839c 100644 --- a/drivers/tty/vt/keyboard.c +++ b/drivers/tty/vt/keyboard.c @@ -311,7 +311,7 @@ int kbd_rate(struct kbd_repeat *rpt) static void put_queue(struct vc_data *vc, int ch) { tty_insert_flip_char(&vc->port, ch, 0); - tty_schedule_flip(&vc->port); + tty_flip_buffer_push(&vc->port); }
static void puts_queue(struct vc_data *vc, char *cp) @@ -320,7 +320,7 @@ static void puts_queue(struct vc_data *vc, char *cp) tty_insert_flip_char(&vc->port, *cp, 0); cp++; } - tty_schedule_flip(&vc->port); + tty_flip_buffer_push(&vc->port); }
static void applkey(struct vc_data *vc, int key, char mode) @@ -565,7 +565,7 @@ static void fn_inc_console(struct vc_data *vc) static void fn_send_intr(struct vc_data *vc) { tty_insert_flip_char(&vc->port, 0, TTY_BREAK); - tty_schedule_flip(&vc->port); + tty_flip_buffer_push(&vc->port); }
static void fn_scroll_forw(struct vc_data *vc) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 0a6336d54a65..30fc2a60c352 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -1834,7 +1834,7 @@ static void csi_m(struct vc_data *vc) static void respond_string(const char *p, size_t len, struct tty_port *port) { tty_insert_flip_string(port, p, len); - tty_schedule_flip(port); + tty_flip_buffer_push(port); }
static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
From: Jiri Slaby jslaby@suse.cz
stable inclusion from stable-v5.10.134 commit 4d374625cca21ce4f9cdd58170d070b400910ae2 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5A5Y1 CVE: CVE-2022-1462
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
commit b68b914494df4f79b4e9b58953110574af1cb7a2 upstream.
Since commit a9c3f68f3cd8d (tty: Fix low_latency BUG) in 2014, tty_flip_buffer_push() is only a wrapper to tty_schedule_flip(). We are going to remove the latter (as it is used less), so call the former in the rest of the users.
Cc: Richard Henderson rth@twiddle.net Cc: Ivan Kokshaysky ink@jurassic.park.msu.ru Cc: Matt Turner mattst88@gmail.com Cc: William Hubbs w.d.hubbs@gmail.com Cc: Chris Brannon chris@the-brannons.com Cc: Kirk Reiser kirk@reisers.ca Cc: Samuel Thibault samuel.thibault@ens-lyon.org Cc: Heiko Carstens hca@linux.ibm.com Cc: Vasily Gorbik gor@linux.ibm.com Cc: Christian Borntraeger borntraeger@de.ibm.com Cc: Alexander Gordeev agordeev@linux.ibm.com Reviewed-by: Johan Hovold johan@kernel.org Signed-off-by: Jiri Slaby jslaby@suse.cz Link: https://lore.kernel.org/r/20211122111648.30379-3-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yi Yang yiyang13@huawei.com Reviewed-by: Wang Weiyang wangweiyang2@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- arch/alpha/kernel/srmcons.c | 2 +- drivers/accessibility/speakup/spk_ttyio.c | 4 ++-- drivers/s390/char/keyboard.h | 4 ++-- 3 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/alpha/kernel/srmcons.c b/arch/alpha/kernel/srmcons.c index 438b10c44d73..2b7a314b8452 100644 --- a/arch/alpha/kernel/srmcons.c +++ b/arch/alpha/kernel/srmcons.c @@ -59,7 +59,7 @@ srmcons_do_receive_chars(struct tty_port *port) } while((result.bits.status & 1) && (++loops < 10));
if (count) - tty_schedule_flip(port); + tty_flip_buffer_push(port);
return count; } diff --git a/drivers/accessibility/speakup/spk_ttyio.c b/drivers/accessibility/speakup/spk_ttyio.c index 6284aff434a1..da3a24557a03 100644 --- a/drivers/accessibility/speakup/spk_ttyio.c +++ b/drivers/accessibility/speakup/spk_ttyio.c @@ -88,7 +88,7 @@ static int spk_ttyio_receive_buf2(struct tty_struct *tty, }
if (!ldisc_data->buf_free) - /* ttyio_in will tty_schedule_flip */ + /* ttyio_in will tty_flip_buffer_push */ return 0;
/* Make sure the consumer has read buf before we have seen @@ -334,7 +334,7 @@ static unsigned char ttyio_in(int timeout) mb(); ldisc_data->buf_free = true; /* Let TTY push more characters */ - tty_schedule_flip(speakup_tty->port); + tty_flip_buffer_push(speakup_tty->port);
return rv; } diff --git a/drivers/s390/char/keyboard.h b/drivers/s390/char/keyboard.h index c467589c7f45..c06d399b9b1f 100644 --- a/drivers/s390/char/keyboard.h +++ b/drivers/s390/char/keyboard.h @@ -56,7 +56,7 @@ static inline void kbd_put_queue(struct tty_port *port, int ch) { tty_insert_flip_char(port, ch, 0); - tty_schedule_flip(port); + tty_flip_buffer_push(port); }
static inline void @@ -64,5 +64,5 @@ kbd_puts_queue(struct tty_port *port, char *cp) { while (*cp) tty_insert_flip_char(port, *cp++, 0); - tty_schedule_flip(port); + tty_flip_buffer_push(port); }
From: Jiri Slaby jslaby@suse.cz
stable inclusion from stable-v5.10.134 commit c84986d097451203bb79a8bff8d37e56488fbf1d category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5A5Y1 CVE: CVE-2022-1462
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
commit 5db96ef23bda6c2a61a51693c85b78b52d03f654 upstream.
Since commit a9c3f68f3cd8d (tty: Fix low_latency BUG) in 2014, tty_flip_buffer_push() is only a wrapper to tty_schedule_flip(). All users were converted in the previous patches, so remove tty_schedule_flip() completely while inlining its body into tty_flip_buffer_push().
One less exported function.
Reviewed-by: Johan Hovold johan@kernel.org Signed-off-by: Jiri Slaby jslaby@suse.cz Link: https://lore.kernel.org/r/20211122111648.30379-4-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yi Yang yiyang13@huawei.com Reviewed-by: Wang Weiyang wangweiyang2@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/tty/tty_buffer.c | 30 ++++++++---------------------- include/linux/tty_flip.h | 1 - 2 files changed, 8 insertions(+), 23 deletions(-)
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index 713cfa72d251..85bbd28ddd8c 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -395,27 +395,6 @@ int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag) } EXPORT_SYMBOL(__tty_insert_flip_char);
-/** - * tty_schedule_flip - push characters to ldisc - * @port: tty port to push from - * - * Takes any pending buffers and transfers their ownership to the - * ldisc side of the queue. It then schedules those characters for - * processing by the line discipline. - */ - -void tty_schedule_flip(struct tty_port *port) -{ - struct tty_bufhead *buf = &port->buf; - - /* paired w/ acquire in flush_to_ldisc(); ensures - * flush_to_ldisc() sees buffer data. - */ - smp_store_release(&buf->tail->commit, buf->tail->used); - queue_work(system_unbound_wq, &buf->work); -} -EXPORT_SYMBOL(tty_schedule_flip); - /** * tty_prepare_flip_string - make room for characters * @port: tty port @@ -558,7 +537,14 @@ static void flush_to_ldisc(struct work_struct *work)
void tty_flip_buffer_push(struct tty_port *port) { - tty_schedule_flip(port); + struct tty_bufhead *buf = &port->buf; + + /* + * Paired w/ acquire in flush_to_ldisc(); ensures flush_to_ldisc() sees + * buffer data. + */ + smp_store_release(&buf->tail->commit, buf->tail->used); + queue_work(system_unbound_wq, &buf->work); } EXPORT_SYMBOL(tty_flip_buffer_push);
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h index 767f62086bd9..e183f74b19a0 100644 --- a/include/linux/tty_flip.h +++ b/include/linux/tty_flip.h @@ -12,7 +12,6 @@ extern int tty_insert_flip_string_fixed_flag(struct tty_port *port, extern int tty_prepare_flip_string(struct tty_port *port, unsigned char **chars, size_t size); extern void tty_flip_buffer_push(struct tty_port *port); -void tty_schedule_flip(struct tty_port *port); int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);
static inline int tty_insert_flip_char(struct tty_port *port,
From: Jiri Slaby jslaby@suse.cz
stable inclusion from stable-v5.10.134 commit a4bb7ef2d6f6d7158539f95b2fa97d658ea3cf75 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5A5Y1 CVE: CVE-2022-1462
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
commit 716b10580283fda66f2b88140e3964f8a7f9da89 upstream.
We will need this new helper in the next patch.
Cc: Hillf Danton hdanton@sina.com Cc: 一只狗 chennbnbnb@gmail.com Cc: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Jiri Slaby jslaby@suse.cz Link: https://lore.kernel.org/r/20220707082558.9250-1-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yi Yang yiyang13@huawei.com Reviewed-by: Wang Weiyang wangweiyang2@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/tty/tty_buffer.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index 85bbd28ddd8c..60a2f6b7deb3 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -524,6 +524,15 @@ static void flush_to_ldisc(struct work_struct *work)
}
+static inline void tty_flip_buffer_commit(struct tty_buffer *tail) +{ + /* + * Paired w/ acquire in flush_to_ldisc(); ensures flush_to_ldisc() sees + * buffer data. + */ + smp_store_release(&tail->commit, tail->used); +} + /** * tty_flip_buffer_push - terminal * @port: tty port to push @@ -539,11 +548,7 @@ void tty_flip_buffer_push(struct tty_port *port) { struct tty_bufhead *buf = &port->buf;
- /* - * Paired w/ acquire in flush_to_ldisc(); ensures flush_to_ldisc() sees - * buffer data. - */ - smp_store_release(&buf->tail->commit, buf->tail->used); + tty_flip_buffer_commit(buf->tail); queue_work(system_unbound_wq, &buf->work); } EXPORT_SYMBOL(tty_flip_buffer_push);
From: Jiri Slaby jslaby@suse.cz
stable inclusion from stable-v5.10.134 commit 08afa87f58d83dfe040572ed591b47e8cb9e225c category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5A5Y1 CVE: CVE-2022-1462
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
commit a501ab75e7624d133a5a3c7ec010687c8b961d23 upstream.
There is a race in pty_write(). pty_write() can be called in parallel with e.g. ioctl(TIOCSTI) or ioctl(TCXONC) which also inserts chars to the buffer. Provided, tty_flip_buffer_push() in pty_write() is called outside the lock, it can commit inconsistent tail. This can lead to out of bounds writes and other issues. See the Link below.
To fix this, we have to introduce a new helper called tty_insert_flip_string_and_push_buffer(). It does both tty_insert_flip_string() and tty_flip_buffer_commit() under the port lock. It also calls queue_work(), but outside the lock. See 71a174b39f10 (pty: do tty_flip_buffer_push without port->lock in pty_write) for the reasons.
Keep the helper internal-only (in drivers' tty.h). It is not intended to be used widely.
Link: https://seclists.org/oss-sec/2022/q2/155 Fixes: 71a174b39f10 (pty: do tty_flip_buffer_push without port->lock in pty_write) Cc: 一只狗 chennbnbnb@gmail.com Cc: Dan Carpenter dan.carpenter@oracle.com Suggested-by: Hillf Danton hdanton@sina.com Signed-off-by: Jiri Slaby jslaby@suse.cz Link: https://lore.kernel.org/r/20220707082558.9250-2-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yi Yang yiyang13@huawei.com Reviewed-by: Wang Weiyang wangweiyang2@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/tty/pty.c | 14 ++------------ drivers/tty/tty_buffer.c | 31 +++++++++++++++++++++++++++++++ include/linux/tty_flip.h | 3 +++ 3 files changed, 36 insertions(+), 12 deletions(-)
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c index 23368cec7ee8..16498f5fba64 100644 --- a/drivers/tty/pty.c +++ b/drivers/tty/pty.c @@ -111,21 +111,11 @@ static void pty_unthrottle(struct tty_struct *tty) static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c) { struct tty_struct *to = tty->link; - unsigned long flags;
- if (tty->stopped) + if (tty->stopped || !c) return 0;
- if (c > 0) { - spin_lock_irqsave(&to->port->lock, flags); - /* Stuff the data into the input queue of the other end */ - c = tty_insert_flip_string(to->port, buf, c); - spin_unlock_irqrestore(&to->port->lock, flags); - /* And shovel */ - if (c) - tty_flip_buffer_push(to->port); - } - return c; + return tty_insert_flip_string_and_push_buffer(to->port, buf, c); }
/** diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index 60a2f6b7deb3..a9823616dd2d 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -553,6 +553,37 @@ void tty_flip_buffer_push(struct tty_port *port) } EXPORT_SYMBOL(tty_flip_buffer_push);
+/** + * tty_insert_flip_string_and_push_buffer - add characters to the tty buffer and + * push + * @port: tty port + * @chars: characters + * @size: size + * + * The function combines tty_insert_flip_string() and tty_flip_buffer_push() + * with the exception of properly holding the @port->lock. + * + * To be used only internally (by pty currently). + * + * Returns: the number added. + */ +int tty_insert_flip_string_and_push_buffer(struct tty_port *port, + const unsigned char *chars, size_t size) +{ + struct tty_bufhead *buf = &port->buf; + unsigned long flags; + + spin_lock_irqsave(&port->lock, flags); + size = tty_insert_flip_string(port, chars, size); + if (size) + tty_flip_buffer_commit(buf->tail); + spin_unlock_irqrestore(&port->lock, flags); + + queue_work(system_unbound_wq, &buf->work); + + return size; +} + /** * tty_buffer_init - prepare a tty buffer structure * @port: tty port to initialise diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h index e183f74b19a0..c326bfdb5ec2 100644 --- a/include/linux/tty_flip.h +++ b/include/linux/tty_flip.h @@ -39,4 +39,7 @@ static inline int tty_insert_flip_string(struct tty_port *port, extern void tty_buffer_lock_exclusive(struct tty_port *port); extern void tty_buffer_unlock_exclusive(struct tty_port *port);
+int tty_insert_flip_string_and_push_buffer(struct tty_port *port, + const unsigned char *chars, size_t cnt); + #endif /* _LINUX_TTY_FLIP_H */
From: Herbert Xu herbert@gondor.apana.org.au
mainline inclusion from mainline-v6.0-rc3 commit ba953a9d89a00c078b85f4b190bc1dde66fe16b5 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5OPA4 CVE: CVE-2022-3028
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
--------------------------------
When namespace support was added to xfrm/afkey, it caused the previously single-threaded call to xfrm_probe_algs to become multi-threaded. This is buggy and needs to be fixed with a mutex.
Reported-by: Abhishek Shah abhishek.shah@columbia.edu Fixes: 283bc9f35bbb ("xfrm: Namespacify xfrm state/policy locks") Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Xu Jia xujia39@huawei.com Reviewed-by: Wei Yongjun weiyongjun1@huawei.com Reviewed-by: Wang Weiyang wangweiyang2@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- net/key/af_key.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/net/key/af_key.c b/net/key/af_key.c index 6b7ed5568c09..4f2dd13aa307 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -1701,9 +1701,12 @@ static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sad pfk->registered |= (1<<hdr->sadb_msg_satype); }
+ mutex_lock(&pfkey_mutex); xfrm_probe_algs();
supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO); + mutex_unlock(&pfkey_mutex); + if (!supp_skb) { if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) pfk->registered &= ~(1<<hdr->sadb_msg_satype);
From: Christoph Hellwig hch@lst.de
mainline inclusion from mainline-v5.15-rc1 commit 417b962ddeca2b70eb72d28c87541bdad4e234f8 category: bugfix bugzilla: 187567, https://gitee.com/openeuler/kernel/issues/I5PK1G CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs...
--------------------------------
Just like most other file systems: get the simple checks out of the way first.
Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Zhihao Cheng chengzhihao1@huawei.com Reviewed-by: Zhang Yi yi.zhang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- fs/configfs/dir.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index 5ad27e484014..e28ab91d973d 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -465,6 +465,9 @@ static struct dentry * configfs_lookup(struct inode *dir, int found = 0; int err;
+ if (dentry->d_name.len > NAME_MAX) + return ERR_PTR(-ENAMETOOLONG); + /* * Fake invisibility if dir belongs to a group/default groups hierarchy * being attached @@ -495,8 +498,6 @@ static struct dentry * configfs_lookup(struct inode *dir, * If it doesn't exist and it isn't a NOT_PINNED item, * it must be negative. */ - if (dentry->d_name.len > NAME_MAX) - return ERR_PTR(-ENAMETOOLONG); d_add(dentry, NULL); return NULL; }
From: Christoph Hellwig hch@lst.de
mainline inclusion from mainline-v5.15-rc1 commit 899587c8d0908e5124fd074d52bf05b4b0633a79 category: bugfix bugzilla: 187567, https://gitee.com/openeuler/kernel/issues/I5PK1G CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs...
--------------------------------
Return the error directly instead of using a goto.
Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Zhihao Cheng chengzhihao1@huawei.com Reviewed-by: Zhang Yi yi.zhang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- fs/configfs/dir.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index e28ab91d973d..59c5a1519386 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -476,9 +476,8 @@ static struct dentry * configfs_lookup(struct inode *dir, * not complete their initialization, since the dentries of the * attributes won't be instantiated. */ - err = -ENOENT; if (!configfs_dirent_is_ready(parent_sd)) - goto out; + return ERR_PTR(-ENOENT);
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if (sd->s_type & CONFIGFS_NOT_PINNED) { @@ -502,7 +501,6 @@ static struct dentry * configfs_lookup(struct inode *dir, return NULL; }
-out: return ERR_PTR(err); }
From: Christoph Hellwig hch@lst.de
mainline inclusion from mainline-v5.15-rc1 commit d07f132a225c013e59aa77f514ad9211ecab82ee category: bugfix bugzilla: 187567, https://gitee.com/openeuler/kernel/issues/I5PK1G CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs...
--------------------------------
This makes it more clear what gets added to the dcache and prepares for an additional locking fix.
Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Zhihao Cheng chengzhihao1@huawei.com Reviewed-by: Zhang Yi yi.zhang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- fs/configfs/dir.c | 73 ++++++++++++++++------------------------------- 1 file changed, 24 insertions(+), 49 deletions(-)
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index 59c5a1519386..31749d06bde2 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -55,7 +55,7 @@ static void configfs_d_iput(struct dentry * dentry, /* * Set sd->s_dentry to null only when this dentry is the one * that is going to be killed. Otherwise configfs_d_iput may - * run just after configfs_attach_attr and set sd->s_dentry to + * run just after configfs_lookup and set sd->s_dentry to * NULL even it's still in use. */ if (sd->s_dentry == dentry) @@ -426,44 +426,13 @@ static void configfs_remove_dir(struct config_item * item) dput(dentry); }
- -/* attaches attribute's configfs_dirent to the dentry corresponding to the - * attribute file - */ -static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * dentry) -{ - struct configfs_attribute * attr = sd->s_element; - struct inode *inode; - - spin_lock(&configfs_dirent_lock); - dentry->d_fsdata = configfs_get(sd); - sd->s_dentry = dentry; - spin_unlock(&configfs_dirent_lock); - - inode = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) | S_IFREG); - if (IS_ERR(inode)) { - configfs_put(sd); - return PTR_ERR(inode); - } - if (sd->s_type & CONFIGFS_ITEM_BIN_ATTR) { - inode->i_size = 0; - inode->i_fop = &configfs_bin_file_operations; - } else { - inode->i_size = PAGE_SIZE; - inode->i_fop = &configfs_file_operations; - } - d_add(dentry, inode); - return 0; -} - static struct dentry * configfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { struct configfs_dirent * parent_sd = dentry->d_parent->d_fsdata; struct configfs_dirent * sd; - int found = 0; - int err; + struct inode *inode = NULL;
if (dentry->d_name.len > NAME_MAX) return ERR_PTR(-ENAMETOOLONG); @@ -480,28 +449,34 @@ static struct dentry * configfs_lookup(struct inode *dir, return ERR_PTR(-ENOENT);
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { - if (sd->s_type & CONFIGFS_NOT_PINNED) { - const unsigned char * name = configfs_get_name(sd); + if ((sd->s_type & CONFIGFS_NOT_PINNED) && + !strcmp(configfs_get_name(sd), dentry->d_name.name)) { + struct configfs_attribute *attr = sd->s_element; + umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG;
- if (strcmp(name, dentry->d_name.name)) - continue; + spin_lock(&configfs_dirent_lock); + dentry->d_fsdata = configfs_get(sd); + sd->s_dentry = dentry; + spin_unlock(&configfs_dirent_lock);
- found = 1; - err = configfs_attach_attr(sd, dentry); + inode = configfs_create(dentry, mode); + if (IS_ERR(inode)) { + configfs_put(sd); + return ERR_CAST(inode); + } + if (sd->s_type & CONFIGFS_ITEM_BIN_ATTR) { + inode->i_size = 0; + inode->i_fop = &configfs_bin_file_operations; + } else { + inode->i_size = PAGE_SIZE; + inode->i_fop = &configfs_file_operations; + } break; } }
- if (!found) { - /* - * If it doesn't exist and it isn't a NOT_PINNED item, - * it must be negative. - */ - d_add(dentry, NULL); - return NULL; - } - - return ERR_PTR(err); + d_add(dentry, inode); + return NULL; }
/*
From: Sishuai Gong sishuai@purdue.edu
mainline inclusion from mainline-v5.15-rc1 commit c42dd069be8dfc9b2239a5c89e73bbd08ab35de0 category: bugfix bugzilla: 187567, https://gitee.com/openeuler/kernel/issues/I5PK1G CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs...
--------------------------------
When configfs_lookup() is executing list_for_each_entry(), it is possible that configfs_dir_lseek() is calling list_del(). Some unfortunate interleavings of them can cause a kernel NULL pointer dereference error
Thread 1 Thread 2 //configfs_dir_lseek() //configfs_lookup() list_del(&cursor->s_sibling); list_for_each_entry(sd, ...)
Fix this by grabbing configfs_dirent_lock in configfs_lookup() while iterating ->s_children.
Signed-off-by: Sishuai Gong sishuai@purdue.edu Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Zhihao Cheng chengzhihao1@huawei.com Reviewed-by: Zhang Yi yi.zhang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- fs/configfs/dir.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index 31749d06bde2..cefa4e48278e 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -448,13 +448,13 @@ static struct dentry * configfs_lookup(struct inode *dir, if (!configfs_dirent_is_ready(parent_sd)) return ERR_PTR(-ENOENT);
+ spin_lock(&configfs_dirent_lock); list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if ((sd->s_type & CONFIGFS_NOT_PINNED) && !strcmp(configfs_get_name(sd), dentry->d_name.name)) { struct configfs_attribute *attr = sd->s_element; umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG;
- spin_lock(&configfs_dirent_lock); dentry->d_fsdata = configfs_get(sd); sd->s_dentry = dentry; spin_unlock(&configfs_dirent_lock); @@ -471,10 +471,11 @@ static struct dentry * configfs_lookup(struct inode *dir, inode->i_size = PAGE_SIZE; inode->i_fop = &configfs_file_operations; } - break; + goto done; } } - + spin_unlock(&configfs_dirent_lock); +done: d_add(dentry, inode); return NULL; }
From: Daniel Borkmann daniel@iogearbox.net
mainline inclusion from mainline-v6.0-rc4 commit a657182a5c5150cdfacb6640aad1d2712571a409 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5PNIO CVE: CVE-2022-2905
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
--------------------------------
Hsin-Wei reported a KASAN splat triggered by their BPF runtime fuzzer which is based on a customized syzkaller:
BUG: KASAN: slab-out-of-bounds in bpf_int_jit_compile+0x1257/0x13f0 Read of size 8 at addr ffff888004e90b58 by task syz-executor.0/1489 CPU: 1 PID: 1489 Comm: syz-executor.0 Not tainted 5.19.0 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x9c/0xc9 print_address_description.constprop.0+0x1f/0x1f0 ? bpf_int_jit_compile+0x1257/0x13f0 kasan_report.cold+0xeb/0x197 ? kvmalloc_node+0x170/0x200 ? bpf_int_jit_compile+0x1257/0x13f0 bpf_int_jit_compile+0x1257/0x13f0 ? arch_prepare_bpf_dispatcher+0xd0/0xd0 ? rcu_read_lock_sched_held+0x43/0x70 bpf_prog_select_runtime+0x3e8/0x640 ? bpf_obj_name_cpy+0x149/0x1b0 bpf_prog_load+0x102f/0x2220 ? __bpf_prog_put.constprop.0+0x220/0x220 ? find_held_lock+0x2c/0x110 ? __might_fault+0xd6/0x180 ? lock_downgrade+0x6e0/0x6e0 ? lock_is_held_type+0xa6/0x120 ? __might_fault+0x147/0x180 __sys_bpf+0x137b/0x6070 ? bpf_perf_link_attach+0x530/0x530 ? new_sync_read+0x600/0x600 ? __fget_files+0x255/0x450 ? lock_downgrade+0x6e0/0x6e0 ? fput+0x30/0x1a0 ? ksys_write+0x1a8/0x260 __x64_sys_bpf+0x7a/0xc0 ? syscall_enter_from_user_mode+0x21/0x70 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f917c4e2c2d
The problem here is that a range of tnum_range(0, map->max_entries - 1) has limited ability to represent the concrete tight range with the tnum as the set of resulting states from value + mask can result in a superset of the actual intended range, and as such a tnum_in(range, reg->var_off) check may yield true when it shouldn't, for example tnum_range(0, 2) would result in 00XX -> v = 0000, m = 0011 such that the intended set of {0, 1, 2} is here represented by a less precise superset of {0, 1, 2, 3}. As the register is known const scalar, really just use the concrete reg->var_off.value for the upper index check.
Fixes: d2e4c1e6c294 ("bpf: Constant map key tracking for prog array pokes") Reported-by: Hsin-Wei Hung hsinweih@uci.edu Signed-off-by: Daniel Borkmann daniel@iogearbox.net Cc: Shung-Hsi Yu shung-hsi.yu@suse.com Acked-by: John Fastabend john.fastabend@gmail.com Link: https://lore.kernel.org/r/984b37f9fdf7ac36831d2137415a4a915744c1b6.166146265... Signed-off-by: Alexei Starovoitov ast@kernel.org Signed-off-by: Pu Lehui pulehui@huawei.com Reviewed-by: Kuohai Xu xukuohai@huawei.com Reviewed-by: Xiu Jianfeng xiujianfeng@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- kernel/bpf/verifier.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 6423f1714a2f..edd5685f0153 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -5333,8 +5333,7 @@ record_func_key(struct bpf_verifier_env *env, struct bpf_call_arg_meta *meta, struct bpf_insn_aux_data *aux = &env->insn_aux_data[insn_idx]; struct bpf_reg_state *regs = cur_regs(env), *reg; struct bpf_map *map = meta->map_ptr; - struct tnum range; - u64 val; + u64 val, max; int err;
if (func_id != BPF_FUNC_tail_call) @@ -5344,10 +5343,11 @@ record_func_key(struct bpf_verifier_env *env, struct bpf_call_arg_meta *meta, return -EINVAL; }
- range = tnum_range(0, map->max_entries - 1); reg = ®s[BPF_REG_3]; + val = reg->var_off.value; + max = map->max_entries;
- if (!register_is_const(reg) || !tnum_in(range, reg->var_off)) { + if (!(register_is_const(reg) && val < max)) { bpf_map_key_store(aux, BPF_MAP_KEY_POISON); return 0; } @@ -5355,8 +5355,6 @@ record_func_key(struct bpf_verifier_env *env, struct bpf_call_arg_meta *meta, err = mark_chain_precision(env, BPF_REG_3); if (err) return err; - - val = reg->var_off.value; if (bpf_map_key_unseen(aux)) bpf_map_key_store(aux, val); else if (!bpf_map_key_poisoned(aux) &&
From: Pu Lehui pulehui@huawei.com
mainline inclusion from mainline-v6.0-rc4 commit 7d6620f107bae6ed687ff07668e8e8f855487aa9 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5POF1 CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
--------------------------------
Syzkaller reported a triggered kernel BUG as follows:
------------[ cut here ]------------ kernel BUG at kernel/bpf/cgroup.c:925! invalid opcode: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 194 Comm: detach Not tainted 5.19.0-14184-g69dac8e431af #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:__cgroup_bpf_detach+0x1f2/0x2a0 Code: 00 e8 92 60 30 00 84 c0 75 d8 4c 89 e0 31 f6 85 f6 74 19 42 f6 84 28 48 05 00 00 02 75 0e 48 8b 80 c0 00 00 00 48 85 c0 75 e5 <0f> 0b 48 8b 0c5 RSP: 0018:ffffc9000055bdb0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888100ec0800 RCX: ffffc900000f1000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888100ec4578 RBP: 0000000000000000 R08: ffff888100ec0800 R09: 0000000000000040 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100ec4000 R13: 000000000000000d R14: ffffc90000199000 R15: ffff888100effb00 FS: 00007f68213d2b80(0000) GS:ffff88813bc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f74a0e5850 CR3: 0000000102836000 CR4: 00000000000006e0 Call Trace: <TASK> cgroup_bpf_prog_detach+0xcc/0x100 __sys_bpf+0x2273/0x2a00 __x64_sys_bpf+0x17/0x20 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f68214dbcb9 Code: 08 44 89 e0 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff8 RSP: 002b:00007ffeb487db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f68214dbcb9 RDX: 0000000000000090 RSI: 00007ffeb487db70 RDI: 0000000000000009 RBP: 0000000000000003 R08: 0000000000000012 R09: 0000000b00000003 R10: 00007ffeb487db70 R11: 0000000000000246 R12: 00007ffeb487dc20 R13: 0000000000000004 R14: 0000000000000001 R15: 000055f74a1011b0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]---
Repetition steps:
For the following cgroup tree,
root | cg1 | cg2
1. attach prog2 to cg2, and then attach prog1 to cg1, both bpf progs attach type is NONE or OVERRIDE. 2. write 1 to /proc/thread-self/fail-nth for failslab. 3. detach prog1 for cg1, and then kernel BUG occur.
Failslab injection will cause kmalloc fail and fall back to purge_effective_progs. The problem is that cg2 have attached another prog, so when go through cg2 layer, iteration will add pos to 1, and subsequent operations will be skipped by the following condition, and cg will meet NULL in the end.
`if (pos && !(cg->bpf.flags[atype] & BPF_F_ALLOW_MULTI))`
The NULL cg means no link or prog match, this is as expected, and it's not a bug. So here just skip the no match situation.
Fixes: 4c46091ee985 ("bpf: Fix KASAN use-after-free Read in compute_effective_progs") Signed-off-by: Pu Lehui pulehui@huawei.com Signed-off-by: Daniel Borkmann daniel@iogearbox.net Acked-by: Andrii Nakryiko andrii@kernel.org Link: https://lore.kernel.org/bpf/20220813134030.1972696-1-pulehui@huawei.com Reviewed-by: Kuohai Xu xukuohai@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- kernel/bpf/cgroup.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c index e1d0c6248aae..e84002f11866 100644 --- a/kernel/bpf/cgroup.c +++ b/kernel/bpf/cgroup.c @@ -709,8 +709,10 @@ static void purge_effective_progs(struct cgroup *cgrp, struct bpf_prog *prog, pos++; } } + + /* no link or prog match, skip the cgroup of this layer */ + continue; found: - BUG_ON(!cg); progs = rcu_dereference_protected( desc->bpf.effective[atype], lockdep_is_held(&cgroup_mutex));
From: Lu Jialin lujialin4@huawei.com
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4IMAK CVE: NA
--------
This patch changes HIGH_ASYNC_RATIO_BASE from 10 to 100 and changes HIGH_ASYNC_RATIO_GAP from 1 to 10. After this patch, user can set high_async_ratio from 0 to 99, which will make memcg async reclaim more delicacy management. If high_async_ratio is smaller than 10, try to reclaim all the pages of the memcg.
Signed-off-by: Lu Jialin lujialin4@huawei.com Reviewed-by: Kefeng Wang wangkefeng.wang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- mm/memcontrol.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index e15389aeb641..0082942c9753 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -119,8 +119,8 @@ static bool do_memsw_account(void) */
#define HIGH_ASYNC_RATIO_DEFAULT 0 -#define HIGH_ASYNC_RATIO_BASE 10 -#define HIGH_ASYNC_RATIO_GAP 1 +#define HIGH_ASYNC_RATIO_BASE 100 +#define HIGH_ASYNC_RATIO_GAP 10
/* * Cgroups above their limits are maintained in a RB-Tree, independent of @@ -2405,9 +2405,12 @@ static unsigned long reclaim_high(struct mem_cgroup *memcg, static unsigned long get_reclaim_pages(struct mem_cgroup *memcg) { unsigned long nr_pages = page_counter_read(&memcg->memory); - int ratio = READ_ONCE(memcg->high_async_ratio) - HIGH_ASYNC_RATIO_GAP; - unsigned long safe_pages = READ_ONCE(memcg->memory.high) * ratio / - HIGH_ASYNC_RATIO_BASE; + int ratio = READ_ONCE(memcg->high_async_ratio); + unsigned long safe_pages; + + ratio = ratio < HIGH_ASYNC_RATIO_GAP ? 0 : ratio - HIGH_ASYNC_RATIO_GAP; + safe_pages = READ_ONCE(memcg->memory.high) * ratio / + HIGH_ASYNC_RATIO_BASE;
return (nr_pages > safe_pages) ? (nr_pages - safe_pages) : MEMCG_CHARGE_BATCH;
From: Lu Jialin lujialin4@huawei.com
hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4IMAK CVE: NA
--------
The patch fixes the problem of cat memory.high_async_ratio. After this patch, when user cat memory.high_async_ratio, the correct memory.high_async_ratio will be shown.
Show case: /sys/fs/cgroup/test # cat memory.high_async_ratio 0 /sys/fs/cgroup/test # echo 90 > memory.high_async_ratio /sys/fs/cgroup/test # cat memory.high_async_ratio 90 /sys/fs/cgroup/test # echo 85 > memory.high_async_ratio /sys/fs/cgroup/test # cat memory.high_async_ratio 85
Signed-off-by: Lu Jialin lujialin4@huawei.com Reviewed-by: Kefeng Wang wangkefeng.wang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- mm/memcontrol.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 0082942c9753..ac07a0ffbe20 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5291,8 +5291,9 @@ static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf,
static int memcg_high_async_ratio_show(struct seq_file *m, void *v) { - return seq_puts_memcg_tunable(m, - READ_ONCE(mem_cgroup_from_seq(m)->high_async_ratio)); + seq_printf(m, "%d\n", + READ_ONCE(mem_cgroup_from_seq(m)->high_async_ratio)); + return 0; }
static ssize_t memcg_high_async_ratio_write(struct kernfs_open_file *of,
-
Zheng Zengkai