Christian Brauner
79bf58c7c4
coredump: hand a pidfd to the usermode coredump helper ...
commit b5325b2a270fcaf7b2a9a0f23d422ca8a5a8bdea upstream.
Give userspace a way to instruct the kernel to install a pidfd into the
usermode helper process. This makes coredump handling a lot more
reliable for userspace. In parallel with this commit we already have
systemd adding support for this in [1].
We create a pidfs file for the coredumping process when we process the
corename pattern. When the usermode helper process is forked we then
install the pidfs file as file descriptor three into the usermode
helpers file descriptor table so it's available to the exec'd program.
Since usermode helpers are either children of the system_unbound_wq
workqueue or kthreadd we know that the file descriptor table is empty
and can thus always use three as the file descriptor number.
Note, that we'll install a pidfd for the thread-group leader even if a
subthread is calling do_coredump(). We know that task linkage hasn't
been removed due to delay_group_leader() and even if this @current isn't
the actual thread-group leader we know that the thread-group leader
cannot be reaped until @current has exited.
[brauner: This is a backport for the v5.4 series. Upstream has
significantly changed and backporting all that infra is a non-starter.
So simply backport the pidfd_prepare() helper and waste the file
descriptor we allocated. Then we minimally massage the umh coredump
setup code.]
Link: https://github.com/systemd/systemd/pull/37125 [1]
Link: https://lore.kernel.org/20250414-work-coredump-v2-3-685bf231f828@kernel.org
Tested-by: Luca Boccassi <luca.boccassi@gmail.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-06-04 14:32:36 +02:00
can: sja1000: fix size of OCR_MODE_MASK define
2022-12-19 12:24:16 +01:00
firmware: meson_sm: Rework driver as a proper platform driver
2024-04-13 12:51:26 +02:00
mailbox: zynqmp: Fix typo in IPI documentation
2023-05-17 11:35:55 +02:00
net: xgene: Move shared header file into include/linux
2023-02-06 07:52:47 +01:00
mfd: t7l66xb: Drop platform disable callback
2022-08-25 11:18:04 +02:00
net/mlx4_core: Avoid impossible mlx4_db_alloc() order value
2025-06-04 14:32:33 +02:00
RDMA/mlx5: Enforce same type port association for multiport RoCE
2025-01-09 13:23:34 +01:00
mmc: core: add helpers mmc_regulator_enable/disable_vqmmc
2023-12-13 18:18:15 +01:00
mtd: rawnand: protect access to rawnand devices while in suspend
2024-11-17 14:58:51 +01:00
netfilter: Replace zero-length array with flexible-array member
2025-01-09 13:23:35 +01:00
netfilter: Replace zero-length array with flexible-array member
2025-01-09 13:23:35 +01:00
netfilter: Replace zero-length array with flexible-array member
2025-01-09 13:23:35 +01:00
netfilter: Replace zero-length array with flexible-array member
2025-01-09 13:23:35 +01:00
netfilter: Replace zero-length array with flexible-array member
2025-01-09 13:23:35 +01:00
ASoC: Intel: Move soc_intel_is_foo() helpers to a generic header
2024-08-19 05:33:42 +02:00
power: supply: bq27xxx: Fix poll_interval handling and races on remove
2023-05-30 12:44:10 +01:00
qed: Improve the stack space of filter_config()
2024-08-19 05:33:30 +02:00
sched/smt: Always inline sched_smt_active()
2025-04-10 14:29:42 +02:00
firmware: ti_sci: Replace HTTP links with HTTPS ones
2023-11-20 10:30:12 +01:00
spi: Fix deadlock when adding SPI controllers on SPI buses
2024-11-17 14:58:51 +01:00
SUNRPC: Replace internal use of SOCKWQ_ASYNC_NOSPACE
2024-12-14 19:44:42 +01:00
usb: xhci: Add timeout argument in address_device USB HCD callback
2025-03-13 12:43:05 +01:00
ACPI/IORT: Make iort_msi_map_rid() PCI agnostic
2023-12-13 18:18:10 +01:00
ata: fix ata_id_has_dipm()
2022-10-26 13:22:39 +02:00
writeback: fix false warning in inode_to_wb()
2025-05-02 07:39:19 +02:00
coredump: hand a pidfd to the usermode coredump helper
2025-06-04 14:32:36 +02:00
bitfield.h: Fix "type of reg too small for mask" test
2022-07-29 17:14:18 +02:00
fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE
2024-09-04 13:14:50 +02:00
ocfs2/dlm: move BITS_TO_BYTES() to bitops.h for wider use
2023-06-09 10:28:54 +02:00
block: return unsigned int from bdev_io_min
2024-12-14 19:44:41 +01:00
bpf: Add map and need_defer parameters to .map_fd_put_ptr()
2024-02-23 08:24:57 +01:00
fs: only do a memory barrier for the first set_buffer_uptodate()
2022-09-15 12:04:49 +02:00
cgroup: Move rcu_head up near the top of cgroup_root
2024-12-14 19:44:35 +01:00
memcg: fix possible use-after-free in memcg_write_event_control()
2022-12-14 11:30:43 +01:00
clk: Fix undefined reference to `clk_rate_exclusive_{get,put}'
2023-08-30 16:27:27 +02:00
ftruncate: pass a signed offset
2024-07-05 09:08:31 +02:00
Fix gcc 4.9 build issue in 5.4.y
2024-08-19 05:33:53 +02:00
init: Provide arch_cpu_finalize_init()
2023-08-08 19:56:33 +02:00
hrtimers: Push pending hrtimers away from outgoing CPU earlier
2023-12-13 18:18:09 +01:00
bitmap: introduce generic optimized bitmap_size()
2024-09-04 13:14:50 +02:00
cred: switch to using atomic_long_t
2023-12-20 15:41:18 +01:00
debugfs: regset32: Add Runtime PM support
2023-05-17 11:35:32 +02:00
PM/devfreq: governor: Add a private governor_data for governor
2023-01-18 11:41:52 +01:00
dm mpath: pass IO start time to path selector
2024-09-04 13:14:58 +02:00
driver: platform: Add helper for safer setting of driver_override
2023-11-08 11:23:39 +01:00
linux/dim: Do nothing if no time delta between samples
2023-05-30 12:44:01 +01:00
dma-mapping: avoid potential unused data compilation warning
2025-06-04 14:32:29 +02:00
dma-mapping: drop the dev argument to arch_sync_dma_for_*
2023-04-05 11:16:43 +02:00
dmaengine: fix is_slave_direction() return false when DMA_DEV_TO_DEV
2024-02-23 08:25:06 +01:00
dyndbg: fix module.dyndbg handling
2022-10-26 13:22:37 +02:00
misc: eeprom: eeprom_93cx6: Add quirk for extra read clock cycle
2024-12-14 19:44:55 +01:00
efi: random: reduce seed size to 32 bytes
2022-11-10 17:57:55 +01:00
ethernet: Add helper for assigning packet type when dest address does not match device address
2024-05-02 16:18:36 +02:00
eventfd: Export eventfd_ctx_do_read()
2023-09-23 10:59:40 +02:00
bpf: Mark bpf_spin_{lock,unlock}() helpers with notrace correctly
2024-03-26 18:22:15 -04:00
objtool: Add support for intra-function calls
2024-04-13 12:51:29 +02:00
fuse: don't truncate cached, mutated symlink
2025-04-10 14:29:36 +02:00
fsnotify: Do not generate events for O_PATH file descriptors
2024-07-18 11:40:51 +02:00
ftrace: Mark get_lock_parent_ip() __always_inline
2023-04-20 12:07:34 +02:00
mm, vmscan: prevent infinite loop for costly GFP_NOIO | __GFP_RETRY_MAYFAIL allocations
2024-04-13 12:51:34 +02:00
HID: fix HID device resource race between HID core and debugging support
2023-12-08 08:44:23 +01:00
mm/highmem: Lift memcpy_[to|from]_page to core
2023-01-18 11:41:55 +01:00
gpu: host1x: mipi: Update tegra_mipi_request() to be node based
2024-03-26 18:22:18 -04:00
hrtimers: Handle CPU state correctly on hotplug
2025-02-01 18:18:51 +01:00
hugetlb: check for undefined shift on 32 bit architectures
2023-02-22 12:50:39 +01:00
Drivers: hv: util: Avoid accessing a ringbuffer not initialized yet
2025-01-09 13:23:33 +01:00
i2c: Use IS_REACHABLE() for substituting empty ACPI functions
2024-09-12 11:03:50 +02:00
clockevents/drivers/i8253: Fix stop sequence for timer 0
2025-04-10 14:29:34 +02:00
Fix termination state for idr_for_each_entry_ul()
2023-11-20 10:30:15 +01:00
net: handle ARPHRD_PPP in dev_is_mac_header_xmit()
2023-09-23 10:59:55 +02:00
team: fix null-ptr-deref when team device type is changed
2023-10-10 21:46:37 +02:00
af_packet: fix vlan_get_protocol_dgram() vs MSG_PEEK
2025-01-09 13:23:35 +01:00
ima: Align ima_file_mmap() parameters with mmap_file LSM hook
2023-03-11 16:44:02 +01:00
interconnect: Add helpers for enabling/disabling a path
2023-08-30 16:27:13 +02:00
lockdep: Don't disable interrupts on RT in disable_irq_nosync_lockdep.*()
2025-04-10 14:29:40 +02:00
iomap: iomap that extends beyond EOF should be marked dirty
2022-09-28 11:03:58 +02:00
iommu: Return right value in iommu_sva_bind_device()
2024-07-05 09:08:16 +02:00
resource: Add irqresource_disabled()
2023-10-25 11:53:22 +02:00
iommu/iova: Fix module config properly
2022-10-26 13:22:46 +02:00
genirq: Allow irq_chip registration functions to take a const irq_chip
2024-08-19 05:33:45 +02:00
genirq: Allow the PM device to originate from irq domain
2024-08-19 05:33:43 +02:00
jbd2: introduce/export functions jbd2_journal_submit|finish_inode_data_buffers()
2024-11-08 16:20:30 +01:00
time: Fix references to _msecs_to_jiffies() handling of values
2024-12-14 19:44:23 +01:00
module: Extend the preempt disabled section in dereference_symbol_descriptor().
2025-03-13 12:42:59 +01:00
panic: Consolidate open-coded panic_on_warn checks
2023-02-06 07:52:50 +01:00
genirq: Fix the return type of kstat_cpu_irqs_sum()
2023-03-11 16:43:38 +01:00
kfifo: fix kfifo_to_user() return type
2022-08-25 11:18:04 +02:00
x86/kprobes: Fix arch_check_optimized_kprobe check within optimized_kprobe range
2023-03-11 16:44:02 +01:00
KVM: Explicitly verify target vCPU is online in kvm_get_vcpu()
2025-03-13 12:43:07 +01:00
leds: class: Protect brightness_show() with led_cdev->led_access mutex
2024-12-14 19:44:53 +01:00
ata: libata-sata: increase PMP SRST timeout to 10s
2023-10-10 21:46:42 +02:00
list: add "list_del_init_careful()" to go with "list_empty_careful()"
2023-06-28 10:18:35 +02:00
drm/syncobj: make lockdep complain on WAIT_FOR_SUBMIT v3
2024-03-01 13:13:38 +01:00
lsm: new security_file_ioctl_compat() hook
2024-02-23 08:25:15 +01:00
ext4: fix deadlock due to mbcache entry corruption
2023-01-18 11:41:56 +01:00
mcb: remove is_added flag from mcb_device struct
2023-10-25 11:53:19 +02:00
net: phy: mchp: Add support for LAN8814 QUAD PHY
2024-07-05 09:08:27 +02:00
mm: add remap_pfn_range_notrack
2024-11-17 14:58:53 +01:00
mm: fix ambiguous comments for better code readability
2024-11-17 14:58:53 +01:00
mmap locking API: initial implementation as rwsem wrappers
2022-07-29 17:14:18 +02:00
mm: Fix '.data.once' orphan section warning
2022-12-08 11:23:04 +01:00
x86/cpu: Add a steppings field to struct x86_cpu_id
2022-10-07 09:16:54 +02:00
params: lift param_set_uint_minmax to common code
2024-06-16 13:28:45 +02:00
new helper: lookup_positive_unlocked()
2023-09-23 10:59:40 +02:00
net: add dev_net_rcu() helper
2025-03-13 12:43:17 +01:00
Remove DECnet support from kernel
2023-06-21 15:44:10 +02:00
Remove DECnet support from kernel
2023-06-21 15:44:10 +02:00
netpoll: netpoll_send_skb() returns transmit status
2025-04-10 14:29:35 +02:00
nfs: add missing selections of CONFIG_CRC32
2025-05-02 07:39:20 +02:00
fs/nls: make load_nls() take a const parameter
2023-09-23 10:59:38 +02:00
watchdog/perf: define dummy watchdog_update_hrtimer_threshold() on correct config
2023-07-27 08:37:10 +02:00
uaccess: Add speculation barrier to copy_from_user()
2023-02-25 11:53:26 +01:00
nvme-tcp: fix nvme_tcp_term_pdu to match spec
2023-04-05 11:16:38 +02:00
nvme: fixup comment for nvme RDMA Provider Type
2024-07-05 09:08:28 +02:00
mlxsw: spectrum_acl_erp: Fix object nesting warning
2024-08-19 05:33:28 +02:00
of: Add missing 'Return' section in kerneldoc comments
2023-12-13 18:18:11 +01:00
of/irq: Make of_msi_map_rid() PCI bus agnostic
2023-12-13 18:18:11 +01:00
once: fix section mismatch on clang builds
2022-11-01 19:06:42 +01:00
overflow: Allow mixed type arguments
2025-03-13 12:42:52 +01:00
PCI: Rename PCI_IRQ_LEGACY to PCI_IRQ_INTX
2025-05-02 07:39:25 +02:00
can: ems_pci: move ASIX AX99100 ids to pci_ids.h
2025-03-13 12:43:18 +01:00
perf/core: Add a new read format to get a number of lost samples
2023-12-13 18:18:15 +01:00
pid: add pidfd_prepare()
2025-06-04 14:32:36 +02:00
driver: platform: Add helper for safer setting of driver_override
2023-11-08 11:23:39 +01:00
PM: domains: Restore comment indentation for generic_pm_domain.child_links
2023-05-17 11:36:04 +02:00
PM: runtime: Have devm_pm_runtime_enable() handle pm_runtime_dont_use_autosuspend()
2024-02-23 08:25:14 +01:00
PM / wakeirq: support enabling wake-up irq after runtime_suspend called
2023-08-11 11:54:00 +02:00
poll_wait: add mb() to fix theoretical race between waitqueue_active() and .poll()
2025-02-01 18:18:51 +01:00
power: supply: core: Refactor power_supply_set_input_current_limit_from_supplier()
2023-06-05 08:17:31 +02:00
pps: Fix a use-after-free
2025-03-13 12:43:19 +01:00
sched/rt: Provide migrate_disable/enable() inlines
2023-11-20 10:30:12 +01:00
printk: declare printk_deferred_{enter,safe}() in include/linux/printk.h
2023-05-17 11:36:04 +02:00
net, proc: Provide PROC_FS=n fallback for proc_create_net_single_write()
2023-01-18 11:41:02 +01:00
pwm: Fix double shift bug
2023-11-28 16:50:16 +00:00
quota: Fix slow quotaoff
2023-10-25 11:53:18 +02:00
quota: Fix slow quotaoff
2023-10-25 11:53:18 +02:00
scsi: core: raid_class: Remove raid_component_add()
2023-08-30 16:27:27 +02:00
random: always mix cycle counter in add_latent_entropy()
2023-02-25 11:53:25 +01:00
rcu: add a helper to report consolidated flavor QS
2024-03-26 18:22:25 -04:00
rcu: fix header guard for rcu_all_qs()
2025-06-04 14:32:34 +02:00
locking/refcount: Consolidate implementations of refcount_t
2022-07-29 17:14:17 +02:00
regmap: Add bulk read/write callbacks into regmap_config
2024-03-15 10:48:20 -04:00
ring-buffer: Rename ring_buffer_read() to read_buffer_iter_advance()
2024-09-12 11:03:56 +02:00
mm/rmap: Fix anon_vma->degree ambiguity leading to double-reuse
2022-09-05 10:27:46 +02:00
rpmsg: Fix calling device_lock() on non-initialized device
2023-11-08 11:23:39 +01:00
misc: rtsx_usb: use separate command and response buffers
2022-07-12 16:30:49 +02:00
scatterlist: add generic wrappers for iterating over sgtable objects
2023-02-25 11:53:25 +01:00
kernel/sched: Remove dl_boosted flag comment
2022-09-05 10:27:39 +02:00
lsm: new security_file_ioctl_compat() hook
2024-02-23 08:25:15 +01:00
Revert "8250: add support for ASIX devices with a FIFO bug"
2023-07-27 08:37:38 +02:00
serial: core: fix kernel-doc for uart_port_unlock_irqrestore()
2024-05-02 16:18:37 +02:00
sh: intc: Avoid spurious sizeof-pointer-div warning
2023-03-22 13:28:08 +01:00
skbuff: introduce skb_expand_head()
2025-01-09 13:23:32 +01:00
net: stmmac: do not stop RX_CLK in Rx LPI state for qcs404 SoC
2023-02-22 12:50:34 +01:00
lib/string_helpers: Introduce string_upper() and string_lower() helpers
2023-05-30 12:44:08 +01:00
ftruncate: pass a signed offset
2024-07-05 09:08:31 +02:00
sysctl: add a new register_sysctl_init() interface
2023-02-06 07:52:48 +01:00
tcp: add TCP_INFO status for failed client TFO
2024-07-18 11:40:53 +02:00
tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem
2023-05-17 11:35:57 +02:00
timers: Rename del_timer_sync() to timer_delete_sync()
2024-04-13 12:51:21 +02:00
timerqueue: Use rb_entry_safe() in timerqueue_getnext()
2023-01-18 11:40:53 +01:00
efi: tpm: Avoid READ_ONCE() for accessing the event log
2023-01-18 11:42:00 +01:00
tracing: Constify string literal data member in struct trace_event_call
2025-01-09 13:23:33 +01:00
tracing: Make tracepoint lockdep check actually test something
2023-03-22 13:28:08 +01:00
tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH
2023-05-17 11:36:04 +02:00
tty: use new tty_insert_flip_string_and_push_buffer() in pty_write()
2022-07-29 17:14:20 +02:00
types: Complement the aligned types with signed 64-bit one
2025-06-04 14:32:27 +02:00
u64_stats: fix u64_stats_init() for lockdep when used repeatedly in one file
2024-05-02 16:18:28 +02:00
uaccess: Add minimum bounds check on kernel buffer size
2023-03-11 16:43:56 +01:00
units: add the HZ macros
2024-02-23 08:24:47 +01:00
xhci: use pm_ptr() instead of #ifdef for CONFIG_PM conditionals
2025-02-01 18:18:54 +01:00
util_macros.h: fix/rework find_closest() macros
2024-12-14 19:44:43 +01:00
vfio: Introduce interface to flush virqfd inject workqueue
2024-04-13 12:51:34 +02:00
net: do not allow gso_size to be set to GSO_BY_FRAGS
2023-08-30 16:27:17 +02:00
linux/vt_buffer.h: allow either builtin or modular for macros
2023-05-17 11:35:46 +02:00
epoll: Add synchronous wakeup support for ep_poll_callback
2025-01-09 13:23:32 +01:00
workqueue: clean up WORK_* constant types, clarify masking
2023-07-27 08:37:29 +02:00
