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[PATCH OLK-6.6 0/1] arm64: Add non nmi ipi backtrace support
by Liao Chen 08 Jan '24

08 Jan '24

From: linruizhe <linruizhe(a)huawei.com> Dependencies: CONFIG_DETECT_HUNG_TASK=y CONFIG_WATCHDOG=y Li Zhengyu (1): arm64: Add non nmi ipi backtrace support arch/arm64/Kconfig | 8 +++++ arch/arm64/configs/openeuler_defconfig | 1 + arch/arm64/kernel/ipi_nmi.c | 41 ++++++++++++++++++++++---- 3 files changed, 45 insertions(+), 5 deletions(-) -- 2.25.1

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[PATCH OLK-6.6 V1 00/12] sched: basic infrastructure for scheduler bpf
by Guan Jing 08 Jan '24

08 Jan '24

sched: basic infrastructure for scheduler bpf Guan Jing (12): sched: programmable: Introduce bpf sched sched: programmable: Add a tag for the task sched: programmable: Add a tag for the task group sched: programmable: Add user interface of task group tag sched: programmable: Add user interface of task tag sched: basic infrastructure for scheduler bpf sched: introduce bpf_sched_enable() libbpf: add support for scheduler bpf programs bpftool: recognize scheduler programs sched: Add helper functions to get cpu statistics sched: programmable: Add hook in select_task_rq_fair() sched: programmable: Add hook in can_migrate_task() arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + fs/proc/base.c | 64 ++++++++++++++ include/linux/bpf_sched.h | 50 +++++++++++ include/linux/bpf_types.h | 4 + include/linux/sched.h | 39 +++++++++ include/linux/sched_hook_defs.h | 4 + include/uapi/linux/bpf.h | 9 ++ init/init_task.c | 3 + kernel/bpf/Kconfig | 12 +++ kernel/bpf/btf.c | 1 + kernel/bpf/syscall.c | 27 ++++++ kernel/bpf/trampoline.c | 1 + kernel/bpf/verifier.c | 11 ++- kernel/sched/bpf_sched.c | 102 +++++++++++++++++++++ kernel/sched/build_utility.c | 4 + kernel/sched/core.c | 117 +++++++++++++++++++++++++ kernel/sched/fair.c | 46 ++++++++++ kernel/sched/sched.h | 10 +++ scripts/bpf_doc.py | 4 + tools/include/uapi/linux/bpf.h | 9 ++ tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 23 ++++- tools/lib/bpf/libbpf.h | 2 + tools/lib/bpf/libbpf.map | 1 + 25 files changed, 544 insertions(+), 2 deletions(-) create mode 100644 include/linux/bpf_sched.h create mode 100644 include/linux/sched_hook_defs.h create mode 100644 kernel/sched/bpf_sched.c -- 2.34.1

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[PATCH v3 OLK-6.6 00/10] Backport etmem feature to OLK 6.6
by Yuchen Tang 08 Jan '24

08 Jan '24

v2 -> v3 - fix code style and commit messages v1 -> v2 - make independent patches to export symbols we need - make independent patches for etmem scan and swap config - fix indentation and code style problems Yuchen Tang (10): etmem: add ETMEM feature CONFIG to mm/Kconfig etmem: add ETMEM scan feature CONFIG to mm/Kconfig mm: Export symbol __pud_trans_huge_lock mm: Export symbol walk_page_range etmem: add etmem scan feature mm: Export symbol reclaim_pages etmem: add etmem swap feature etmem: add original kernel swap enabled options etmem: add swapcache reclaim to etmem etmem: enable etmem configurations arch/arm64/configs/openeuler_defconfig | 3 + arch/x86/configs/openeuler_defconfig | 3 + fs/proc/Makefile | 3 + fs/proc/base.c | 8 + fs/proc/etmem_proc.c | 216 ++++ fs/proc/etmem_scan.c | 1383 ++++++++++++++++++++++++ fs/proc/etmem_scan.h | 149 +++ fs/proc/etmem_swap.c | 283 +++++ fs/proc/internal.h | 4 + include/linux/etmem.h | 75 ++ include/linux/mm.h | 4 + include/linux/mm_types.h | 5 + include/linux/swap.h | 1 + include/uapi/asm-generic/mman-common.h | 4 + mm/Kconfig | 33 + mm/Makefile | 1 + mm/etmem.c | 384 +++++++ mm/huge_memory.c | 1 + mm/internal.h | 1 - mm/madvise.c | 16 + mm/pagewalk.c | 1 + mm/swap_state.c | 4 + mm/vmscan.c | 16 + virt/kvm/kvm_main.c | 8 + 24 files changed, 2605 insertions(+), 1 deletion(-) create mode 100644 fs/proc/etmem_proc.c create mode 100644 fs/proc/etmem_scan.c create mode 100644 fs/proc/etmem_scan.h create mode 100644 fs/proc/etmem_swap.c create mode 100644 include/linux/etmem.h create mode 100644 mm/etmem.c -- 2.33.0

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[PATCH OLK-6.6 0/9] Add swap control for memcg
by Jinjiang Tu 08 Jan '24

08 Jan '24

This series patches add swap control for memory cgroup. Patch[1] add page type in memory.reclaim interface to support reclaim anon pages. Patch[3] add memory.force_swapin interface to support swap back pages proactively. Patch[4-6] add memory.swapfile interface to limit available swap device for memory cgroup. Patch[7] add memory.swap.max interface to limit usage of swap for memory cgroup. Jinjiang Tu (1): memcg: make sysctl registeration more extensible Liu Shixin (7): memcg: add page type to memory.reclaim interface memcg: introduce memcg swap qos feature memcg: introduce per-memcg swapin interface memcg: add restrict to swap to cgroup1 mm/swapfile: introduce per-memcg swapfile control mm: swap_slots: add per-type slot cache config: enable memcg swap qos for x86_64 and arm64 by default zhaoxiaoqiang11 (1): memcg/swap: add ability to disable memcg swap .../admin-guide/cgroup-v1/memory.rst | 3 + Documentation/admin-guide/cgroup-v2.rst | 10 +- arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + include/linux/memcontrol.h | 35 ++ include/linux/mm.h | 4 + include/linux/swap.h | 12 +- include/linux/swap_slots.h | 2 +- init/Kconfig | 9 + mm/madvise.c | 31 +- mm/memcontrol.c | 497 +++++++++++++++++- mm/swap_slots.c | 151 +++++- mm/swapfile.c | 97 +++- mm/vmscan.c | 9 + 14 files changed, 813 insertions(+), 49 deletions(-) -- 2.25.1

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[PATCH OLK-6.6 V1 00/12] infrastructure for scheduler bpf
by Guan Jing 08 Jan '24

08 Jan '24

infrastructure for scheduler bpf Guan Jing (12): sched: programmable: Introduce bpf sched sched: programmable: Add a tag for the task sched: programmable: Add a tag for the task group sched: programmable: Add user interface of task group tag sched: programmable: Add user interface of task tag sched: basic infrastructure for scheduler bpf sched: introduce bpf_sched_enable() libbpf: add support for scheduler bpf programs bpftool: recognize scheduler programs sched: Add helper functions to get cpu statistics sched: programmable: Add hook in select_task_rq_fair() sched: programmable: Add hook in can_migrate_task() arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + fs/proc/base.c | 64 ++++++++++++++ include/linux/bpf_sched.h | 50 +++++++++++ include/linux/bpf_types.h | 4 + include/linux/sched.h | 39 +++++++++ include/linux/sched_hook_defs.h | 4 + include/uapi/linux/bpf.h | 9 ++ init/init_task.c | 3 + kernel/bpf/Kconfig | 12 +++ kernel/bpf/btf.c | 1 + kernel/bpf/syscall.c | 27 ++++++ kernel/bpf/trampoline.c | 1 + kernel/bpf/verifier.c | 11 ++- kernel/sched/bpf_sched.c | 102 +++++++++++++++++++++ kernel/sched/build_utility.c | 4 + kernel/sched/core.c | 117 +++++++++++++++++++++++++ kernel/sched/fair.c | 46 ++++++++++ kernel/sched/sched.h | 10 +++ scripts/bpf_doc.py | 4 + tools/include/uapi/linux/bpf.h | 9 ++ tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 23 ++++- tools/lib/bpf/libbpf.h | 2 + tools/lib/bpf/libbpf.map | 1 + 25 files changed, 544 insertions(+), 2 deletions(-) create mode 100644 include/linux/bpf_sched.h create mode 100644 include/linux/sched_hook_defs.h create mode 100644 kernel/sched/bpf_sched.c -- 2.34.1

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[PATCH OLK-6.6 V1 00/12] infrastructure for scheduler bpf
by Guan Jing 08 Jan '24

08 Jan '24

infrastructure for scheduler bpf Guan Jing (12): sched: programmable: Introduce bpf sched sched: programmable: Add a tag for the task sched: programmable: Add a tag for the task group sched: programmable: Add user interface of task group tag sched: programmable: Add user interface of task tag sched: basic infrastructure for scheduler bpf sched: introduce bpf_sched_enable() libbpf: add support for scheduler bpf programs bpftool: recognize scheduler programs sched: Add helper functions to get cpu statistics sched: programmable: Add hook in select_task_rq_fair() sched: programmable: Add hook in can_migrate_task() arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + fs/proc/base.c | 64 ++++++++++++++ include/linux/bpf_sched.h | 50 +++++++++++ include/linux/bpf_types.h | 4 + include/linux/sched.h | 39 +++++++++ include/linux/sched_hook_defs.h | 4 + include/uapi/linux/bpf.h | 9 ++ init/init_task.c | 3 + kernel/bpf/Kconfig | 12 +++ kernel/bpf/btf.c | 1 + kernel/bpf/syscall.c | 27 ++++++ kernel/bpf/trampoline.c | 1 + kernel/bpf/verifier.c | 11 ++- kernel/sched/bpf_sched.c | 102 +++++++++++++++++++++ kernel/sched/build_utility.c | 4 + kernel/sched/core.c | 117 +++++++++++++++++++++++++ kernel/sched/fair.c | 46 ++++++++++ kernel/sched/sched.h | 10 +++ scripts/bpf_doc.py | 4 + tools/include/uapi/linux/bpf.h | 9 ++ tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 23 ++++- tools/lib/bpf/libbpf.h | 2 + tools/lib/bpf/libbpf.map | 1 + 25 files changed, 544 insertions(+), 2 deletions(-) create mode 100644 include/linux/bpf_sched.h create mode 100644 include/linux/sched_hook_defs.h create mode 100644 kernel/sched/bpf_sched.c -- 2.34.1

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[PATCH OLK-6.6 V2 00/12] infrastructure for scheduler bpf
by Guan Jing 08 Jan '24

08 Jan '24

infrastructure for scheduler bpf Guan Jing (12): sched: programmable: Introduce bpf sched sched: programmable: Add a tag for the task sched: programmable: Add a tag for the task group sched: programmable: Add user interface of task group tag sched: programmable: Add user interface of task tag sched: basic infrastructure for scheduler bpf sched: introduce bpf_sched_enable() libbpf: add support for scheduler bpf programs bpftool: recognize scheduler programs sched: Add helper functions to get cpu statistics sched: programmable: Add hook in select_task_rq_fair() sched: programmable: Add hook in can_migrate_task() arch/arm64/configs/openeuler_defconfig | 1 + arch/x86/configs/openeuler_defconfig | 1 + fs/proc/base.c | 64 ++++++++++++++ include/linux/bpf_sched.h | 50 +++++++++++ include/linux/bpf_types.h | 4 + include/linux/sched.h | 39 +++++++++ include/linux/sched_hook_defs.h | 4 + include/uapi/linux/bpf.h | 9 ++ init/init_task.c | 3 + kernel/bpf/Kconfig | 12 +++ kernel/bpf/btf.c | 1 + kernel/bpf/syscall.c | 27 ++++++ kernel/bpf/trampoline.c | 1 + kernel/bpf/verifier.c | 11 ++- kernel/sched/bpf_sched.c | 102 +++++++++++++++++++++ kernel/sched/build_utility.c | 4 + kernel/sched/core.c | 117 +++++++++++++++++++++++++ kernel/sched/fair.c | 46 ++++++++++ kernel/sched/sched.h | 10 +++ scripts/bpf_doc.py | 4 + tools/include/uapi/linux/bpf.h | 9 ++ tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 23 ++++- tools/lib/bpf/libbpf.h | 2 + tools/lib/bpf/libbpf.map | 1 + 25 files changed, 544 insertions(+), 2 deletions(-) create mode 100644 include/linux/bpf_sched.h create mode 100644 include/linux/sched_hook_defs.h create mode 100644 kernel/sched/bpf_sched.c -- 2.34.1

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[PATCH OLK-6.6] scsi: fix use-after-free problem in scsi_remove_target
by Li Nan 08 Jan '24

08 Jan '24

From: Zhong Jinghua <zhongjinghua(a)huawei.com> hulk inclusion category: bugfix bugzilla: 188355, https://gitee.com/openeuler/kernel/issues/I8UF7W ---------------------------------------- A use-after-free problem like below: BUG: KASAN: use-after-free in scsi_target_reap+0x6c/0x70 Workqueue: scsi_wq_1 __iscsi_unbind_session [scsi_transport_iscsi] Call trace: dump_backtrace+0x0/0x320 show_stack+0x24/0x30 dump_stack+0xdc/0x128 print_address_description+0x68/0x278 kasan_report+0x1e4/0x308 __asan_report_load4_noabort+0x30/0x40 scsi_target_reap+0x6c/0x70 scsi_remove_target+0x430/0x640 __iscsi_unbind_session+0x164/0x268 [scsi_transport_iscsi] process_one_work+0x67c/0x1350 worker_thread+0x370/0xf90 kthread+0x2a4/0x320 ret_from_fork+0x10/0x18 The problem is caused by a concurrency scenario: T0: delete target // echo 1 > /sys/devices/platform/host1/session1/target1:0:0/1:0:0:1/delete T1: logout // iscsiadm -m node --logout T0 T1 sdev_store_delete scsi_remove_device device_remove_file __scsi_remove_device __iscsi_unbind_session scsi_remove_target spin_lock_irqsave list_for_each_entry scsi_target_reap // starget->reap_ref 1 -> 0 kref_get(&starget->reap_ref); // warn use-after-free. spin_unlock_irqrestore scsi_target_reap_ref_release scsi_target_destroy ... // delete starget scsi_target_reap // UAF When T0 reduces the reference count to 0, but has not been released, T1 can still enter list_for_each_entry, and then kref_get reports UAF. Fix it by using kref_get_unless_zero() to check for a reference count of 0. Signed-off-by: Zhong Jinghua <zhongjinghua(a)huawei.com> Reviewed-by: Hou Tao <houtao1(a)huawei.com> Signed-off-by: Jialin Zhang <zhangjialin11(a)huawei.com> Signed-off-by: Li Nan <linan122(a)huawei.com> --- drivers/scsi/scsi_sysfs.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 24f6eefb6803..8fccf2df17f7 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -1584,7 +1584,16 @@ void scsi_remove_target(struct device *dev) starget->state == STARGET_CREATED_REMOVE) continue; if (starget->dev.parent == dev || &starget->dev == dev) { - kref_get(&starget->reap_ref); + /* + * If the reference count is already zero, skip + * this target. Calling kref_get_unless_zero() if + * the reference count is zero is safe because + * scsi_target_destroy() will wait until the host + * lock has been released before freeing starget. + */ + if (!kref_get_unless_zero(&starget->reap_ref)) + continue; + if (starget->state == STARGET_CREATED) starget->state = STARGET_CREATED_REMOVE; else -- 2.39.2

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[PATCH OLK-6.6 00/10] Backport etmem feature to OLK 6.6
by Yuchen Tang 08 Jan '24

08 Jan '24

v2 -> v3 - edit commit message - adjust defconfig v1 -> v2 - make independent patches to export symbols we need - make independent patches for etmem scan and swap config - fix indentation and code style problems Yuchen Tang (10): etmem: a tiered memory manager etmem: etmem scan, the page hotness tracker mm: Export symbol __pud_trans_huge_lock mm: Export symbol walk_page_range etmem: add etmem scan feature mm: Export symbol reclaim_pages etmem: add etmem swap feature etmem: add original kernel swap enabled options etmem: add swapcache reclaim to etmem etmem: enable etmem configurations arch/arm64/configs/openeuler_defconfig | 3 + arch/x86/configs/openeuler_defconfig | 3 + fs/proc/Makefile | 3 + fs/proc/base.c | 8 + fs/proc/etmem_proc.c | 216 ++++ fs/proc/etmem_scan.c | 1383 ++++++++++++++++++++++++ fs/proc/etmem_scan.h | 149 +++ fs/proc/etmem_swap.c | 283 +++++ fs/proc/internal.h | 4 + include/linux/etmem.h | 75 ++ include/linux/mm.h | 4 + include/linux/mm_types.h | 5 + include/linux/swap.h | 1 + include/uapi/asm-generic/mman-common.h | 4 + mm/Kconfig | 33 + mm/Makefile | 1 + mm/etmem.c | 384 +++++++ mm/huge_memory.c | 1 + mm/internal.h | 1 - mm/madvise.c | 16 + mm/pagewalk.c | 1 + mm/swap_state.c | 4 + mm/vmscan.c | 16 + virt/kvm/kvm_main.c | 8 + 24 files changed, 2605 insertions(+), 1 deletion(-) create mode 100644 fs/proc/etmem_proc.c create mode 100644 fs/proc/etmem_scan.c create mode 100644 fs/proc/etmem_scan.h create mode 100644 fs/proc/etmem_swap.c create mode 100644 include/linux/etmem.h create mode 100644 mm/etmem.c -- 2.33.0

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[PATCH OLK-6.6] pid_ns: Make pid_max per namespace
by Yi Yang 08 Jan '24

08 Jan '24

From: Li Zefan <lizefan(a)huawei.com> euler inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8TCPY ------------------------------------------------- The adjusted pid_max on the host also takes effect in the container. Move pid_max to pid_namespace to fix this problem. Signed-off-by: Pavel Emelyanov <xemul(a)parallels.com> Signed-off-by: Yi Yang <yiyang13(a)huawei.com> --- include/linux/pid.h | 2 ++ include/linux/pid_namespace.h | 3 ++ init/Kconfig | 6 ++++ kernel/pid.c | 57 +++++++++++++++++++++++++++++++++++ kernel/pid_namespace.c | 13 ++++++++ kernel/sysctl.c | 2 ++ kernel/trace/pid_list.c | 4 +++ kernel/trace/trace.c | 4 +++ kernel/trace/trace.h | 2 ++ 9 files changed, 93 insertions(+) diff --git a/include/linux/pid.h b/include/linux/pid.h index 653a527574c4..b90bc447d2a2 100644 --- a/include/linux/pid.h +++ b/include/linux/pid.h @@ -113,8 +113,10 @@ extern void transfer_pid(struct task_struct *old, struct task_struct *new, struct pid_namespace; extern struct pid_namespace init_pid_ns; +#ifndef CONFIG_PID_MAX_PER_NAMESPACE extern int pid_max; extern int pid_max_min, pid_max_max; +#endif /* * look up a PID in the hash table. Must be called with the tasklist_lock diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h index f9f9931e02d6..0a7c6dab0b7b 100644 --- a/include/linux/pid_namespace.h +++ b/include/linux/pid_namespace.h @@ -36,6 +36,9 @@ struct pid_namespace { #endif struct user_namespace *user_ns; struct ucounts *ucounts; +#ifdef CONFIG_PID_MAX_PER_NAMESPACE + int pid_max; +#endif int reboot; /* group exit code if this pidns was rebooted */ struct ns_common ns; #if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE) diff --git a/init/Kconfig b/init/Kconfig index 869eea4108d0..8c07d158bb54 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -2104,3 +2104,9 @@ config ARCH_HAS_SYNC_CORE_BEFORE_USERMODE # <asm/syscall_wrapper.h>. config ARCH_HAS_SYSCALL_WRAPPER def_bool n + +config PID_MAX_PER_NAMESPACE + bool "Make pid_max per namespace" + default y + help + Say Y here to enable make pid_max per namespace. diff --git a/kernel/pid.c b/kernel/pid.c index 383abde0c208..4e9267988dd7 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -45,6 +45,10 @@ #include <net/sock.h> #include <uapi/linux/pidfd.h> +#ifdef CONFIG_PID_MAX_PER_NAMESPACE +#include <linux/kmemleak.h> +#endif + struct pid init_struct_pid = { .count = REFCOUNT_INIT(1), .tasks = { @@ -59,12 +63,19 @@ struct pid init_struct_pid = { }, } }; +#ifndef CONFIG_PID_MAX_PER_NAMESPACE int pid_max = PID_MAX_DEFAULT; +#endif #define RESERVED_PIDS 300 +#ifndef CONFIG_PID_MAX_PER_NAMESPACE int pid_max_min = RESERVED_PIDS + 1; int pid_max_max = PID_MAX_LIMIT; +#else +static int pid_max_min = RESERVED_PIDS + 1; +static int pid_max_max = PID_MAX_LIMIT; +#endif /* * PID-map pages start out as NULL, they get allocated upon @@ -80,6 +91,9 @@ struct pid_namespace init_pid_ns = { .child_reaper = &init_task, .user_ns = &init_user_ns, .ns.inum = PROC_PID_INIT_INO, +#ifdef CONFIG_PID_MAX_PER_NAMESPACE + .pid_max = PID_MAX_DEFAULT, +#endif #ifdef CONFIG_PID_NS .ns.ops = &pidns_operations, #endif @@ -194,7 +208,11 @@ struct pid *alloc_pid(struct pid_namespace *ns, pid_t *set_tid, tid = set_tid[ns->level - i]; retval = -EINVAL; +#ifndef CONFIG_PID_MAX_PER_NAMESPACE if (tid < 1 || tid >= pid_max) +#else + if (tid < 1 || tid >= task_active_pid_ns(current)->pid_max) +#endif goto out_free; /* * Also fail if a PID != 1 is requested and @@ -234,7 +252,11 @@ struct pid *alloc_pid(struct pid_namespace *ns, pid_t *set_tid, * a partially initialized PID (see below). */ nr = idr_alloc_cyclic(&tmp->idr, NULL, pid_min, +#ifndef CONFIG_PID_MAX_PER_NAMESPACE pid_max, GFP_ATOMIC); +#else + tmp->pid_max, GFP_ATOMIC); +#endif } spin_unlock_irq(&pidmap_lock); idr_preload_end(); @@ -646,8 +668,37 @@ SYSCALL_DEFINE2(pidfd_open, pid_t, pid, unsigned int, flags) return fd; } +#ifdef CONFIG_PID_MAX_PER_NAMESPACE +static int proc_dointvec_pidmax(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + struct ctl_table tmp; + + tmp = *table; + tmp.data = &task_active_pid_ns(current)->pid_max; + + return proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); +} + +static struct ctl_table pid_ctl_table[] = { + { + .procname = "pid_max", + .data = &init_pid_ns.pid_max, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_pidmax, + .extra1 = &pid_max_min, + .extra2 = &pid_max_max, + }, + {} +}; +#endif + void __init pid_idr_init(void) { +#ifdef CONFIG_PID_MAX_PER_NAMESPACE + int pid_max = init_pid_ns.pid_max; +#endif /* Verify no one has done anything silly: */ BUILD_BUG_ON(PID_MAX_LIMIT >= PIDNS_ADDING); @@ -658,6 +709,9 @@ void __init pid_idr_init(void) PIDS_PER_CPU_MIN * num_possible_cpus()); pr_info("pid_max: default: %u minimum: %u\n", pid_max, pid_max_min); +#ifdef CONFIG_PID_MAX_PER_NAMESPACE + init_pid_ns.pid_max = pid_max; +#endif idr_init(&init_pid_ns.idr); init_pid_ns.pid_cachep = kmem_cache_create("pid", @@ -665,6 +719,9 @@ void __init pid_idr_init(void) __alignof__(struct pid), SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT, NULL); +#ifdef CONFIG_PID_MAX_PER_NAMESPACE + register_sysctl_init("kernel", pid_ctl_table); +#endif } static struct file *__pidfd_fget(struct task_struct *task, int fd) diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index 619972c78774..c837b1096dcb 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -110,6 +110,9 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns ns->user_ns = get_user_ns(user_ns); ns->ucounts = ucounts; ns->pid_allocated = PIDNS_ADDING; +#ifdef CONFIG_PID_MAX_PER_NAMESPACE + ns->pid_max = parent_pid_ns->pid_max; +#endif #if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE) ns->memfd_noexec_scope = pidns_memfd_noexec_scope(parent_pid_ns); #endif @@ -295,6 +298,10 @@ static int pid_ns_ctl_handler(struct ctl_table *table, int write, next = idr_get_cursor(&pid_ns->idr) - 1; tmp.data = &next; +#ifdef CONFIG_PID_MAX_PER_NAMESPACE + tmp.extra2 = &pid_ns->pid_max; +#endif + ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); if (!ret && write) idr_set_cursor(&pid_ns->idr, next + 1); @@ -302,7 +309,9 @@ static int pid_ns_ctl_handler(struct ctl_table *table, int write, return ret; } +#ifndef CONFIG_PID_MAX_PER_NAMESPACE extern int pid_max; +#endif static struct ctl_table pid_ns_ctl_table[] = { { .procname = "ns_last_pid", @@ -310,7 +319,11 @@ static struct ctl_table pid_ns_ctl_table[] = { .mode = 0666, /* permissions are checked in the handler */ .proc_handler = pid_ns_ctl_handler, .extra1 = SYSCTL_ZERO, +#ifndef CONFIG_PID_MAX_PER_NAMESPACE .extra2 = &pid_max, +#else + .extra2 = &init_pid_ns.pid_max, +#endif }, { } }; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 354a2d294f52..e84df0818517 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1809,6 +1809,7 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, #endif +#ifndef CONFIG_PID_MAX_PER_NAMESPACE { .procname = "pid_max", .data = &pid_max, @@ -1818,6 +1819,7 @@ static struct ctl_table kern_table[] = { .extra1 = &pid_max_min, .extra2 = &pid_max_max, }, +#endif { .procname = "panic_on_oops", .data = &panic_on_oops, diff --git a/kernel/trace/pid_list.c b/kernel/trace/pid_list.c index 95106d02b32d..8056d7441d05 100644 --- a/kernel/trace/pid_list.c +++ b/kernel/trace/pid_list.c @@ -414,7 +414,11 @@ struct trace_pid_list *trace_pid_list_alloc(void) int i; /* According to linux/thread.h, pids can be no bigger that 30 bits */ +#ifndef CONFIG_PID_MAX_PER_NAMESPACE WARN_ON_ONCE(pid_max > (1 << 30)); +#else + WARN_ON_ONCE(task_active_pid_ns(current)->pid_max > (1 << 30)); +#endif pid_list = kzalloc(sizeof(*pid_list), GFP_KERNEL); if (!pid_list) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index b656cab67f67..5afa58302b06 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5423,7 +5423,11 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) if (mask == TRACE_ITER_RECORD_TGID) { if (!tgid_map) { +#ifndef CONFIG_PID_MAX_PER_NAMESPACE tgid_map_max = pid_max; +#else + tgid_map_max = init_pid_ns.pid_max; +#endif map = kvcalloc(tgid_map_max + 1, sizeof(*tgid_map), GFP_KERNEL); diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index d608f6128704..52123df262b2 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -695,7 +695,9 @@ extern unsigned long tracing_thresh; /* PID filtering */ +#ifndef CONFIG_PID_MAX_PER_NAMESPACE extern int pid_max; +#endif bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid); -- 2.25.1

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