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compat: new pre-patches for LTS kernels 4.19 and 5.4

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Thomas Schoebel-Theuer 2021-02-08 13:51:27 +01:00 committed by Thomas Schoebel-Theuer
parent 4a84f041bd
commit a38f8778a6
6 changed files with 699 additions and 0 deletions
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36
pre-patches/vanilla-4.19/0001-mars-SPECIAL-for-in-tree-build.patch Normal file
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@ -0,0 +1,36 @@
From aa34ea4ff232877673e28b27222a89a4a3e93498 Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Fri, 28 Jun 2013 11:03:14 +0200
Subject: [PATCH] mars: SPECIAL for in-tree build
---
block/Kconfig | 2 ++
block/Makefile | 2 ++
2 files changed, 4 insertions(+)
diff --git a/block/Kconfig b/block/Kconfig
index 1f2469a0123c..7c0b776276aa 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -206,6 +206,8 @@ source "block/partitions/Kconfig"
endmenu
+source block/mars/kernel/Kconfig
+
endif # BLOCK
config BLOCK_COMPAT
diff --git a/block/Makefile b/block/Makefile
index 572b33f32c07..a8115cdc4112 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -37,3 +37,5 @@ obj-$(CONFIG_BLK_WBT) += blk-wbt.o
obj-$(CONFIG_BLK_DEBUG_FS) += blk-mq-debugfs.o
obj-$(CONFIG_BLK_DEBUG_FS_ZONED)+= blk-mq-debugfs-zoned.o
obj-$(CONFIG_BLK_SED_OPAL) += sed-opal.o
+
+obj-$(CONFIG_MARS) += mars/kernel/
--
2.26.2

205
pre-patches/vanilla-4.19/0001-mars-v2-minimum-pre-patch-for-mars.patch Normal file
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@ -0,0 +1,205 @@
From 5feb058b6e23e4400a99fec82c8d158b6017597f Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Mon, 25 Jan 2021 13:03:54 +0100
Subject: [PATCH] mars: v2 minimum pre-patch for mars
---
fs/aio.c | 45 ++++++++++++++++++++++++++++++++++----
fs/utimes.c | 2 ++
include/linux/aio.h | 1 +
include/linux/syscalls.h | 10 +++++++++
include/uapi/linux/major.h | 1 +
mm/page_alloc.c | 2 ++
6 files changed, 57 insertions(+), 4 deletions(-)
diff --git a/fs/aio.c b/fs/aio.c
index 413ec289bfa1..b21db36fdb82 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -216,6 +216,7 @@ struct aio_kiocb {
static DEFINE_SPINLOCK(aio_nr_lock);
unsigned long aio_nr; /* current system wide number of aio requests */
unsigned long aio_max_nr = 0x10000; /* system wide maximum number of aio requests */
+EXPORT_SYMBOL_GPL(aio_max_nr);
/*----end sysctl variables---*/
static struct kmem_cache *kiocb_cachep;
@@ -1301,7 +1302,7 @@ static long read_events(struct kioctx *ctx, long min_nr, long nr,
* pointer is passed for ctxp. Will fail with -ENOSYS if not
* implemented.
*/
-SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp)
+long ksys_io_setup(unsigned nr_events, aio_context_t *ctxp)
{
struct kioctx *ioctx = NULL;
unsigned long ctx;
@@ -1330,6 +1331,12 @@ SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp)
out:
return ret;
}
+EXPORT_SYMBOL_GPL(ksys_io_setup);
+
+SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp)
+{
+ return ksys_io_setup(nr_events, ctxp);
+}
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE2(io_setup, unsigned, nr_events, u32 __user *, ctx32p)
@@ -1370,7 +1377,7 @@ COMPAT_SYSCALL_DEFINE2(io_setup, unsigned, nr_events, u32 __user *, ctx32p)
* implemented. May fail with -EINVAL if the context pointed to
* is invalid.
*/
-SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
+long ksys_io_destroy(aio_context_t ctx)
{
struct kioctx *ioctx = lookup_ioctx(ctx);
if (likely(NULL != ioctx)) {
@@ -1399,6 +1406,12 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
pr_debug("EINVAL: invalid context id\n");
return -EINVAL;
}
+EXPORT_SYMBOL_GPL(ksys_io_destroy);
+
+SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
+{
+ return ksys_io_destroy(ctx);
+}
static void aio_remove_iocb(struct aio_kiocb *iocb)
{
@@ -1921,8 +1934,8 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
* are available to queue any iocbs. Will return 0 if nr is 0. Will
* fail with -ENOSYS if not implemented.
*/
-SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
- struct iocb __user * __user *, iocbpp)
+long ksys_io_submit(aio_context_t ctx_id, long nr,
+ struct iocb __user *__user *iocbpp)
{
struct kioctx *ctx;
long ret = 0;
@@ -1959,6 +1972,13 @@ SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
percpu_ref_put(&ctx->users);
return i ? i : ret;
}
+EXPORT_SYMBOL_GPL(ksys_io_submit);
+
+SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
+ struct iocb __user * __user *, iocbpp)
+{
+ return ksys_io_submit(ctx_id, nr, iocbpp);
+}
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
@@ -2073,6 +2093,23 @@ static long do_io_getevents(aio_context_t ctx_id,
return ret;
}
+long ksys_io_getevents(aio_context_t ctx_id,
+ long min_nr,
+ long nr,
+ struct io_event __user * events,
+ struct timespec __user * timeout)
+{
+ struct timespec64 ts;
+
+ if (timeout) {
+ if (unlikely(get_timespec64(&ts, timeout)))
+ return -EFAULT;
+ }
+
+ return do_io_getevents(ctx_id, min_nr, nr, events, timeout ? &ts : NULL);
+}
+EXPORT_SYMBOL_GPL(ksys_io_getevents);
+
/* io_getevents:
* Attempts to read at least min_nr events and up to nr events from
* the completion queue for the aio_context specified by ctx_id. If
diff --git a/fs/utimes.c b/fs/utimes.c
index 69d4b6ba1bfb..0215521c5dbe 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -1,4 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
+#include <linux/module.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/namei.h>
@@ -164,6 +165,7 @@ long do_utimes(int dfd, const char __user *filename, struct timespec64 *times,
out:
return error;
}
+EXPORT_SYMBOL(do_utimes);
SYSCALL_DEFINE4(utimensat, int, dfd, const char __user *, filename,
struct timespec __user *, utimes, int, flags)
diff --git a/include/linux/aio.h b/include/linux/aio.h
index b83e68dd006f..62061e975682 100644
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -12,6 +12,7 @@ typedef int (kiocb_cancel_fn)(struct kiocb *);
/* prototypes */
#ifdef CONFIG_AIO
+#define HAS_AIO_MAX
extern void exit_aio(struct mm_struct *mm);
void kiocb_set_cancel_fn(struct kiocb *req, kiocb_cancel_fn *cancel);
#else
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 2ff814c92f7f..73daac4b9207 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1126,6 +1126,16 @@ asmlinkage long sys_ni_syscall(void);
* the ksys_xyzyyz() functions prototyped below.
*/
+long ksys_io_submit(aio_context_t ctx_id, long nr,
+ struct iocb __user *__user *iocbpp);
+long ksys_io_getevents(aio_context_t ctx_id,
+ long min_nr,
+ long nr,
+ struct io_event __user * events,
+ struct timespec __user * timeout);
+long ksys_io_setup(unsigned nr_events, aio_context_t *ctxp);
+long ksys_io_destroy(aio_context_t ctx);
+
int ksys_mount(char __user *dev_name, char __user *dir_name, char __user *type,
unsigned long flags, void __user *data);
int ksys_umount(char __user *name, int flags);
diff --git a/include/uapi/linux/major.h b/include/uapi/linux/major.h
index 7e5fa8e15c43..edfbce01e4ac 100644
--- a/include/uapi/linux/major.h
+++ b/include/uapi/linux/major.h
@@ -149,6 +149,7 @@
#define UNIX98_PTY_SLAVE_MAJOR (UNIX98_PTY_MASTER_MAJOR+UNIX98_PTY_MAJOR_COUNT)
#define DRBD_MAJOR 147
+#define MARS_MAJOR 148
#define RTF_MAJOR 150
#define RAW_MAJOR 162
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4446a523e684..0f5271b870dd 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -263,6 +263,7 @@ compound_page_dtor * const compound_page_dtors[] = {
};
int min_free_kbytes = 1024;
+EXPORT_SYMBOL(min_free_kbytes);
int user_min_free_kbytes = -1;
int watermark_scale_factor = 10;
@@ -7337,6 +7338,7 @@ static void __setup_per_zone_wmarks(void)
/* update totalreserve_pages */
calculate_totalreserve_pages();
}
+EXPORT_SYMBOL(setup_per_zone_wmarks);
/**
* setup_per_zone_wmarks - called when min_free_kbytes changes
--
2.26.2

104
pre-patches/vanilla-4.19/0001-sched-wait-fix-endless-kthread-loop-at-timeout.patch Normal file
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@ -0,0 +1,104 @@
From aef8a9c9917a83b94ed30bcd4ec400e51cfea937 Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Fri, 8 Mar 2019 08:21:15 +0100
Subject: [PATCH] sched/wait: fix endless kthread loop at timeout
Scenario, possible since kernel 4.11.x and later:
1) kthread calls a waiting function with a timeout, and blocks.
2) kthread_stop() is called by somebody else.
3) kthread makes some progress, but neither finishes nor timeouts.
4) Nothing happens => normally the timeout would be reached by the kthread.
However, the condition in wait_woken() now prevents the call to
schedule_timeout().
As a consequence, the timeout value will never be decreased, resulting
in an endless loop.
This fix ensures the following semantics: kthread_should_stop() is treated
as equivalent to a timeout. This is beneficial because most users do not
want to wait for the timeout, but to stop the kthread as soon as possible.
It appears that this semantics was probably intended (otherwise the check
is_kthread_should_stop() would not make much sense), but just went wrong
due to the bug.
Here is an example, triggered by external kernel module MARS on a
production kernel. However, the problem can be also triggered by other
kthreads and on newer kernels, and also in very different scenarios,
not only during tcp_revcmsg().
In the following example, the kthread simply waits for network packets
to arrive, but in the test scenario the network had been blocked
underneath by a firewall rule in order to trigger the bug:
Mar 08 07:40:08 icpu5133 kernel: watchdog: BUG: soft lockup - CPU#29 stuck for 23s! [mars_receiver8.:8139]
Mar 08 07:40:08 icpu5133 kernel: Modules linked in: mars(-) ip6table_mangle ip6table_raw iptable_raw ip_set_bitmap_port xt_DSCP xt_multiport ip_set_hash_ip xt_own
Mar 08 07:40:08 icpu5133 kernel: irq event stamp: 300719885
Mar 08 07:40:08 icpu5133 kernel: hardirqs last enabled at (300719883): [<ffffffff81bb96d0>] _raw_spin_unlock_irqrestore+0x3d/0x4f
Mar 08 07:40:08 icpu5133 kernel: hardirqs last disabled at (300719885): [<ffffffff81c01a02>] apic_timer_interrupt+0x82/0x90
Mar 08 07:40:08 icpu5133 kernel: softirqs last enabled at (300719878): [<ffffffff819de0af>] lock_sock_nested+0x50/0x98
Mar 08 07:40:08 icpu5133 kernel: softirqs last disabled at (300719884): [<ffffffff819df5f2>] release_sock+0x16/0xda
Mar 08 07:40:08 icpu5133 kernel: CPU: 29 PID: 8139 Comm: mars_receiver8. Not tainted 4.14.104+ #121
Mar 08 07:40:08 icpu5133 kernel: Hardware name: Dell Inc. PowerEdge R630/02C2CP, BIOS 2.5.5 08/16/2017
Mar 08 07:40:08 icpu5133 kernel: task: ffff88bf82764fc0 task.stack: ffffc90012430000
Mar 08 07:40:08 icpu5133 kernel: RIP: 0010:arch_local_irq_restore+0x2/0x8
Mar 08 07:40:08 icpu5133 kernel: RSP: 0018:ffffc90012433b78 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
Mar 08 07:40:08 icpu5133 kernel: RAX: 0000000000000000 RBX: ffff88bf82764fc0 RCX: 00000000fec792b4
Mar 08 07:40:08 icpu5133 kernel: RDX: 00000000c18b50d3 RSI: 0000000000000000 RDI: 0000000000000246
Mar 08 07:40:08 icpu5133 kernel: RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
Mar 08 07:40:08 icpu5133 kernel: R10: ffffc90012433b08 R11: ffffc90012433ba8 R12: 0000000000000246
Mar 08 07:40:08 icpu5133 kernel: R13: ffffffff819df735 R14: 0000000000000001 R15: ffff88bf82765818
Mar 08 07:40:08 icpu5133 kernel: FS: 0000000000000000(0000) GS:ffff88c05fb80000(0000) knlGS:0000000000000000
Mar 08 07:40:08 icpu5133 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar 08 07:40:08 icpu5133 kernel: CR2: 000055abd12eb688 CR3: 000000000241e006 CR4: 00000000001606e0
Mar 08 07:40:08 icpu5133 kernel: Call Trace:
Mar 08 07:40:08 icpu5133 kernel: lock_release+0x32f/0x33b
Mar 08 07:40:08 icpu5133 kernel: release_sock+0x90/0xda
Mar 08 07:40:08 icpu5133 kernel: sk_wait_data+0x7f/0x13f
Mar 08 07:40:08 icpu5133 kernel: ? prepare_to_wait_exclusive+0xc1/0xc1
Mar 08 07:40:08 icpu5133 kernel: tcp_recvmsg+0x4e6/0x91a
Mar 08 07:40:08 icpu5133 kernel: ? flush_signals+0x2b/0x6a
Mar 08 07:40:08 icpu5133 kernel: ? lock_acquire+0x20a/0x25a
Mar 08 07:40:08 icpu5133 kernel: inet_recvmsg+0x8d/0xc0
Mar 08 07:40:08 icpu5133 kernel: kernel_recvmsg+0x8f/0xaa
Mar 08 07:40:08 icpu5133 kernel: ? ___might_sleep+0xf2/0x256
Mar 08 07:40:08 icpu5133 kernel: mars_recv_raw+0x22a/0x4da [mars]
Mar 08 07:40:08 icpu5133 kernel: desc_recv_struct+0x40/0x375 [mars]
Mar 08 07:40:08 icpu5133 kernel: receiver_thread+0xa2/0x61a [mars]
Mar 08 07:40:08 icpu5133 kernel: ? _hash_insert+0x160/0x160 [mars]
Mar 08 07:40:08 icpu5133 kernel: ? kthread+0x1a6/0x1ae
Mar 08 07:40:08 icpu5133 kernel: kthread+0x1a6/0x1ae
Mar 08 07:40:08 icpu5133 kernel: ? __list_del_entry+0x60/0x60
Mar 08 07:40:08 icpu5133 kernel: ret_from_fork+0x3a/0x50
Mar 08 07:40:08 icpu5133 kernel: Code: ee e8 c5 17 00 00 48 85 db 75 0e 31 f6 48 c7 c7 c0 5f 53 82 e8 68 b9 58 00 48 89 5b 58 58 5b 5d c3 9c 58 0f 1f 44 00 00 c3
Signed-off-by: Thomas Schoebel-Theuer <tst@1und1.de>
---
kernel/sched/wait.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c
index 5dd47f1103d1..3e3fa1d319cf 100644
--- a/kernel/sched/wait.c
+++ b/kernel/sched/wait.c
@@ -415,8 +415,15 @@ long wait_woken(struct wait_queue_entry *wq_entry, unsigned mode, long timeout)
* or woken_wake_function() sees our store to current->state.
*/
set_current_state(mode); /* A */
- if (!(wq_entry->flags & WQ_FLAG_WOKEN) && !is_kthread_should_stop())
- timeout = schedule_timeout(timeout);
+ if (!(wq_entry->flags & WQ_FLAG_WOKEN)) {
+ /*
+ * Treat kthread stopping as equivalent to a timeout.
+ */
+ if (is_kthread_should_stop())
+ timeout = 0;
+ else
+ timeout = schedule_timeout(timeout);
+ }
__set_current_state(TASK_RUNNING);
/*
--
2.26.2

36
pre-patches/vanilla-5.4/0001-mars-SPECIAL-for-in-tree-build.patch Normal file
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@ -0,0 +1,36 @@
From f23cc6f8e7d224ee74a4f9d67b91587343e6de60 Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Fri, 28 Jun 2013 11:03:14 +0200
Subject: [PATCH] mars: SPECIAL for in-tree build
---
block/Kconfig | 2 ++
block/Makefile | 2 ++
2 files changed, 4 insertions(+)
diff --git a/block/Kconfig b/block/Kconfig
index 41c0917ce622..ccf181798cb7 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -183,6 +183,8 @@ source "block/partitions/Kconfig"
endmenu
+source "block/mars/kernel/Kconfig"
+
endif # BLOCK
config BLOCK_COMPAT
diff --git a/block/Makefile b/block/Makefile
index 9ef57ace90d4..c074adff6d3a 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -36,3 +36,5 @@ obj-$(CONFIG_BLK_DEBUG_FS) += blk-mq-debugfs.o
obj-$(CONFIG_BLK_DEBUG_FS_ZONED)+= blk-mq-debugfs-zoned.o
obj-$(CONFIG_BLK_SED_OPAL) += sed-opal.o
obj-$(CONFIG_BLK_PM) += blk-pm.o
+
+obj-$(CONFIG_MARS) += mars/kernel/
--
2.26.2

214
pre-patches/vanilla-5.4/0001-mars-v2-minimum-pre-patch-for-mars.patch Normal file
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@ -0,0 +1,214 @@
From 716c3f0a4bc57d0bc045e299463cd191e3560cb5 Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Mon, 25 Jan 2021 13:03:54 +0100
Subject: [PATCH] mars: v2 minimum pre-patch for mars
---
fs/aio.c | 47 ++++++++++++++++++++++++++++++--------
fs/utimes.c | 2 ++
include/linux/aio.h | 1 +
include/linux/syscalls.h | 9 ++++++++
include/uapi/linux/major.h | 1 +
mm/page_alloc.c | 2 ++
6 files changed, 53 insertions(+), 9 deletions(-)
diff --git a/fs/aio.c b/fs/aio.c
index 47bb7b5685ba..f7ff812892ca 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -223,6 +223,7 @@ struct aio_kiocb {
static DEFINE_SPINLOCK(aio_nr_lock);
unsigned long aio_nr; /* current system wide number of aio requests */
unsigned long aio_max_nr = 0x10000; /* system wide maximum number of aio requests */
+EXPORT_SYMBOL_GPL(aio_max_nr);
/*----end sysctl variables---*/
static struct kmem_cache *kiocb_cachep;
@@ -1310,7 +1311,7 @@ static long read_events(struct kioctx *ctx, long min_nr, long nr,
* pointer is passed for ctxp. Will fail with -ENOSYS if not
* implemented.
*/
-SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp)
+long ksys_io_setup(unsigned nr_events, aio_context_t *ctxp)
{
struct kioctx *ioctx = NULL;
unsigned long ctx;
@@ -1339,6 +1340,12 @@ SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp)
out:
return ret;
}
+EXPORT_SYMBOL_GPL(ksys_io_setup);
+
+SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp)
+{
+ return ksys_io_setup(nr_events, ctxp);
+}
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE2(io_setup, unsigned, nr_events, u32 __user *, ctx32p)
@@ -1379,7 +1386,7 @@ COMPAT_SYSCALL_DEFINE2(io_setup, unsigned, nr_events, u32 __user *, ctx32p)
* implemented. May fail with -EINVAL if the context pointed to
* is invalid.
*/
-SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
+long ksys_io_destroy(aio_context_t ctx)
{
struct kioctx *ioctx = lookup_ioctx(ctx);
if (likely(NULL != ioctx)) {
@@ -1408,6 +1415,12 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
pr_debug("EINVAL: invalid context id\n");
return -EINVAL;
}
+EXPORT_SYMBOL_GPL(ksys_io_destroy);
+
+SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
+{
+ return ksys_io_destroy(ctx);
+}
static void aio_remove_iocb(struct aio_kiocb *iocb)
{
@@ -1912,8 +1925,8 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
* are available to queue any iocbs. Will return 0 if nr is 0. Will
* fail with -ENOSYS if not implemented.
*/
-SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
- struct iocb __user * __user *, iocbpp)
+long ksys_io_submit(aio_context_t ctx_id, long nr,
+ struct iocb __user *__user *iocbpp)
{
struct kioctx *ctx;
long ret = 0;
@@ -1952,6 +1965,13 @@ SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
percpu_ref_put(&ctx->users);
return i ? i : ret;
}
+EXPORT_SYMBOL_GPL(ksys_io_submit);
+
+SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
+ struct iocb __user * __user *, iocbpp)
+{
+ return ksys_io_submit(ctx_id, nr, iocbpp);
+}
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id,
@@ -2082,11 +2102,11 @@ static long do_io_getevents(aio_context_t ctx_id,
*/
#if !defined(CONFIG_64BIT_TIME) || defined(CONFIG_64BIT)
-SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
- long, min_nr,
- long, nr,
- struct io_event __user *, events,
- struct __kernel_timespec __user *, timeout)
+int ksys_io_getevents(aio_context_t ctx_id,
+ long min_nr,
+ long nr,
+ struct io_event __user * events,
+ struct __kernel_timespec __user * timeout)
{
struct timespec64 ts;
int ret;
@@ -2099,7 +2119,16 @@ SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
ret = -EINTR;
return ret;
}
+EXPORT_SYMBOL_GPL(ksys_io_getevents);
+SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
+ long, min_nr,
+ long, nr,
+ struct io_event __user *, events,
+ struct __kernel_timespec __user *, timeout)
+{
+ return ksys_io_getevents(ctx_id, min_nr, nr, events, timeout);
+}
#endif
struct __aio_sigset {
diff --git a/fs/utimes.c b/fs/utimes.c
index 090739322463..43a2f990c61f 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -1,4 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
+#include <linux/module.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/namei.h>
@@ -133,6 +134,7 @@ long do_utimes(int dfd, const char __user *filename, struct timespec64 *times,
out:
return error;
}
+EXPORT_SYMBOL(do_utimes);
SYSCALL_DEFINE4(utimensat, int, dfd, const char __user *, filename,
struct __kernel_timespec __user *, utimes, int, flags)
diff --git a/include/linux/aio.h b/include/linux/aio.h
index b83e68dd006f..62061e975682 100644
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -12,6 +12,7 @@ typedef int (kiocb_cancel_fn)(struct kiocb *);
/* prototypes */
#ifdef CONFIG_AIO
+#define HAS_AIO_MAX
extern void exit_aio(struct mm_struct *mm);
void kiocb_set_cancel_fn(struct kiocb *req, kiocb_cancel_fn *cancel);
#else
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index f7c561c4dcdd..22bf0a5e2aa6 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1230,6 +1230,15 @@ asmlinkage long sys_ni_syscall(void);
* Instead, use one of the functions which work equivalently, such as
* the ksys_xyzyyz() functions prototyped below.
*/
+long ksys_io_submit(aio_context_t ctx_id, long nr,
+ struct iocb __user *__user *iocbpp);
+int ksys_io_getevents(aio_context_t ctx_id,
+ long min_nr,
+ long nr,
+ struct io_event __user * events,
+ struct __kernel_timespec __user * timeout);
+long ksys_io_setup(unsigned nr_events, aio_context_t *ctxp);
+long ksys_io_destroy(aio_context_t ctx);
int ksys_mount(const char __user *dev_name, const char __user *dir_name,
const char __user *type, unsigned long flags, void __user *data);
diff --git a/include/uapi/linux/major.h b/include/uapi/linux/major.h
index 7e5fa8e15c43..edfbce01e4ac 100644
--- a/include/uapi/linux/major.h
+++ b/include/uapi/linux/major.h
@@ -149,6 +149,7 @@
#define UNIX98_PTY_SLAVE_MAJOR (UNIX98_PTY_MASTER_MAJOR+UNIX98_PTY_MAJOR_COUNT)
#define DRBD_MAJOR 147
+#define MARS_MAJOR 148
#define RTF_MAJOR 150
#define RAW_MAJOR 162
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4357f5475a50..abbb0bd169d4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -315,6 +315,7 @@ compound_page_dtor * const compound_page_dtors[] = {
};
int min_free_kbytes = 1024;
+EXPORT_SYMBOL(min_free_kbytes);
int user_min_free_kbytes = -1;
#ifdef CONFIG_DISCONTIGMEM
/*
@@ -7826,6 +7827,7 @@ static void __setup_per_zone_wmarks(void)
/* update totalreserve_pages */
calculate_totalreserve_pages();
}
+EXPORT_SYMBOL(setup_per_zone_wmarks);
/**
* setup_per_zone_wmarks - called when min_free_kbytes changes
--
2.26.2

104
pre-patches/vanilla-5.4/0001-sched-wait-fix-endless-kthread-loop-at-timeout.patch Normal file
View File

@ -0,0 +1,104 @@
From ffa9a3c42d05ec2af33756bfabea7717a2299fef Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Fri, 8 Mar 2019 08:21:15 +0100
Subject: [PATCH] sched/wait: fix endless kthread loop at timeout
Scenario, possible since kernel 4.11.x and later:
1) kthread calls a waiting function with a timeout, and blocks.
2) kthread_stop() is called by somebody else.
3) kthread makes some progress, but neither finishes nor timeouts.
4) Nothing happens => normally the timeout would be reached by the kthread.
However, the condition in wait_woken() now prevents the call to
schedule_timeout().
As a consequence, the timeout value will never be decreased, resulting
in an endless loop.
This fix ensures the following semantics: kthread_should_stop() is treated
as equivalent to a timeout. This is beneficial because most users do not
want to wait for the timeout, but to stop the kthread as soon as possible.
It appears that this semantics was probably intended (otherwise the check
is_kthread_should_stop() would not make much sense), but just went wrong
due to the bug.
Here is an example, triggered by external kernel module MARS on a
production kernel. However, the problem can be also triggered by other
kthreads and on newer kernels, and also in very different scenarios,
not only during tcp_revcmsg().
In the following example, the kthread simply waits for network packets
to arrive, but in the test scenario the network had been blocked
underneath by a firewall rule in order to trigger the bug:
Mar 08 07:40:08 icpu5133 kernel: watchdog: BUG: soft lockup - CPU#29 stuck for 23s! [mars_receiver8.:8139]
Mar 08 07:40:08 icpu5133 kernel: Modules linked in: mars(-) ip6table_mangle ip6table_raw iptable_raw ip_set_bitmap_port xt_DSCP xt_multiport ip_set_hash_ip xt_own
Mar 08 07:40:08 icpu5133 kernel: irq event stamp: 300719885
Mar 08 07:40:08 icpu5133 kernel: hardirqs last enabled at (300719883): [<ffffffff81bb96d0>] _raw_spin_unlock_irqrestore+0x3d/0x4f
Mar 08 07:40:08 icpu5133 kernel: hardirqs last disabled at (300719885): [<ffffffff81c01a02>] apic_timer_interrupt+0x82/0x90
Mar 08 07:40:08 icpu5133 kernel: softirqs last enabled at (300719878): [<ffffffff819de0af>] lock_sock_nested+0x50/0x98
Mar 08 07:40:08 icpu5133 kernel: softirqs last disabled at (300719884): [<ffffffff819df5f2>] release_sock+0x16/0xda
Mar 08 07:40:08 icpu5133 kernel: CPU: 29 PID: 8139 Comm: mars_receiver8. Not tainted 4.14.104+ #121
Mar 08 07:40:08 icpu5133 kernel: Hardware name: Dell Inc. PowerEdge R630/02C2CP, BIOS 2.5.5 08/16/2017
Mar 08 07:40:08 icpu5133 kernel: task: ffff88bf82764fc0 task.stack: ffffc90012430000
Mar 08 07:40:08 icpu5133 kernel: RIP: 0010:arch_local_irq_restore+0x2/0x8
Mar 08 07:40:08 icpu5133 kernel: RSP: 0018:ffffc90012433b78 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
Mar 08 07:40:08 icpu5133 kernel: RAX: 0000000000000000 RBX: ffff88bf82764fc0 RCX: 00000000fec792b4
Mar 08 07:40:08 icpu5133 kernel: RDX: 00000000c18b50d3 RSI: 0000000000000000 RDI: 0000000000000246
Mar 08 07:40:08 icpu5133 kernel: RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
Mar 08 07:40:08 icpu5133 kernel: R10: ffffc90012433b08 R11: ffffc90012433ba8 R12: 0000000000000246
Mar 08 07:40:08 icpu5133 kernel: R13: ffffffff819df735 R14: 0000000000000001 R15: ffff88bf82765818
Mar 08 07:40:08 icpu5133 kernel: FS: 0000000000000000(0000) GS:ffff88c05fb80000(0000) knlGS:0000000000000000
Mar 08 07:40:08 icpu5133 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar 08 07:40:08 icpu5133 kernel: CR2: 000055abd12eb688 CR3: 000000000241e006 CR4: 00000000001606e0
Mar 08 07:40:08 icpu5133 kernel: Call Trace:
Mar 08 07:40:08 icpu5133 kernel: lock_release+0x32f/0x33b
Mar 08 07:40:08 icpu5133 kernel: release_sock+0x90/0xda
Mar 08 07:40:08 icpu5133 kernel: sk_wait_data+0x7f/0x13f
Mar 08 07:40:08 icpu5133 kernel: ? prepare_to_wait_exclusive+0xc1/0xc1
Mar 08 07:40:08 icpu5133 kernel: tcp_recvmsg+0x4e6/0x91a
Mar 08 07:40:08 icpu5133 kernel: ? flush_signals+0x2b/0x6a
Mar 08 07:40:08 icpu5133 kernel: ? lock_acquire+0x20a/0x25a
Mar 08 07:40:08 icpu5133 kernel: inet_recvmsg+0x8d/0xc0
Mar 08 07:40:08 icpu5133 kernel: kernel_recvmsg+0x8f/0xaa
Mar 08 07:40:08 icpu5133 kernel: ? ___might_sleep+0xf2/0x256
Mar 08 07:40:08 icpu5133 kernel: mars_recv_raw+0x22a/0x4da [mars]
Mar 08 07:40:08 icpu5133 kernel: desc_recv_struct+0x40/0x375 [mars]
Mar 08 07:40:08 icpu5133 kernel: receiver_thread+0xa2/0x61a [mars]
Mar 08 07:40:08 icpu5133 kernel: ? _hash_insert+0x160/0x160 [mars]
Mar 08 07:40:08 icpu5133 kernel: ? kthread+0x1a6/0x1ae
Mar 08 07:40:08 icpu5133 kernel: kthread+0x1a6/0x1ae
Mar 08 07:40:08 icpu5133 kernel: ? __list_del_entry+0x60/0x60
Mar 08 07:40:08 icpu5133 kernel: ret_from_fork+0x3a/0x50
Mar 08 07:40:08 icpu5133 kernel: Code: ee e8 c5 17 00 00 48 85 db 75 0e 31 f6 48 c7 c7 c0 5f 53 82 e8 68 b9 58 00 48 89 5b 58 58 5b 5d c3 9c 58 0f 1f 44 00 00 c3
Signed-off-by: Thomas Schoebel-Theuer <tst@1und1.de>
---
kernel/sched/wait.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c
index c1e566a114ca..08f121154a91 100644
--- a/kernel/sched/wait.c
+++ b/kernel/sched/wait.c
@@ -412,8 +412,15 @@ long wait_woken(struct wait_queue_entry *wq_entry, unsigned mode, long timeout)
* or woken_wake_function() sees our store to current->state.
*/
set_current_state(mode); /* A */
- if (!(wq_entry->flags & WQ_FLAG_WOKEN) && !is_kthread_should_stop())
- timeout = schedule_timeout(timeout);
+ if (!(wq_entry->flags & WQ_FLAG_WOKEN)) {
+ /*
+ * Treat kthread stopping as equivalent to a timeout.
+ */
+ if (is_kthread_should_stop())
+ timeout = 0;
+ else
+ timeout = schedule_timeout(timeout);
+ }
__set_current_state(TASK_RUNNING);
/*
--
2.26.2