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/linux/Documentation/admin-guide/sysctl/
H A Duser.rst2 Documentation for /proc/sys/user/
12 /proc/sys/user.
16 per user per user namespace limits.
24 The creation of per user per user namespace objects are charged to
25 the user in the user namespace who created the object and
26 verified to be below the per user limit in that user namespace.
29 who created user namespaces the creation of the object happens
30 in (user namespaces can be nested) and verified to be below the per user
31 limits in the user namespaces of those users.
34 user namespace does not allow a user to escape their current limits.
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/linux/arch/arm64/kernel/
H A Dsignal.c111 * Save the user access state into ua_state and reset it to disable any
133 * Set the user access state for invoking the signal handler.
144 * Restore the user access state to the values saved in ua_state.
156 static void init_user_layout(struct rt_sigframe_user_layout *user) in init_user_layout() argument
159 sizeof(user->sigframe->uc.uc_mcontext.__reserved); in init_user_layout()
161 memset(user, 0, sizeof(*user)); in init_user_layout()
162 user->size = offsetof(struct rt_sigframe, uc.uc_mcontext.__reserved); in init_user_layout()
164 user->limit = user->size + reserved_size; in init_user_layout()
166 user->limit -= TERMINATOR_SIZE; in init_user_layout()
167 user->limit -= EXTRA_CONTEXT_SIZE; in init_user_layout()
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/linux/kernel/trace/
H A Dtrace_events_user.c45 * probes to print out to the user.
47 * These do not reflect the mapped bytes between the user and kernel space.
201 typedef void (*user_event_func_t) (struct user_event *user, struct iov_iter *i,
209 static struct user_event_mm *user_event_mm_get_all(struct user_event *user);
211 static int destroy_user_event(struct user_event *user);
212 static bool user_fields_match(struct user_event *user, int argc,
231 static struct user_event *user_event_get(struct user_event *user) in user_event_get() argument
233 refcount_inc(&user->refcnt); in user_event_get()
235 return user; in user_event_get()
240 struct user_event *user = container_of( in delayed_destroy_user_event() local
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/linux/arch/arm/mach-omap2/
H A Domap_hwmod_2xxx_interconnect_data.c27 .user = OCP_USER_MPU | OCP_USER_SDMA,
34 .user = OCP_USER_MPU,
47 .user = OCP_USER_MPU | OCP_USER_SDMA,
54 .user = OCP_USER_MPU | OCP_USER_SDMA,
62 .user = OCP_USER_MPU | OCP_USER_SDMA,
70 .user = OCP_USER_MPU | OCP_USER_SDMA,
78 .user = OCP_USER_MPU | OCP_USER_SDMA,
86 .user = OCP_USER_MPU | OCP_USER_SDMA,
94 .user = OCP_USER_MPU | OCP_USER_SDMA,
102 .user = OCP_USER_MPU | OCP_USER_SDMA,
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/linux/drivers/virt/acrn/
H A Dhypercall.h64 * hcall_create_vm() - Create a User VM
65 * @vminfo: Service VM GPA of info of User VM creation
75 * hcall_start_vm() - Start a User VM
76 * @vmid: User VM ID
86 * hcall_pause_vm() - Pause a User VM
87 * @vmid: User VM ID
97 * hcall_destroy_vm() - Destroy a User VM
98 * @vmid: User VM ID
108 * hcall_reset_vm() - Reset a User VM
109 * @vmid: User VM ID
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/linux/arch/powerpc/include/asm/
H A Dreg_fsl_emb.h53 #define PMLCA_FCU 0x20000000 /* Freeze in User */
84 #define PMRN_UPMC0 0x000 /* User Performance Monitor Counter 0 */
85 #define PMRN_UPMC1 0x001 /* User Performance Monitor Counter 1 */
86 #define PMRN_UPMC2 0x002 /* User Performance Monitor Counter 2 */
87 #define PMRN_UPMC3 0x003 /* User Performance Monitor Counter 3 */
88 #define PMRN_UPMC4 0x004 /* User Performance Monitor Counter 4 */
89 #define PMRN_UPMC5 0x005 /* User Performance Monitor Counter 5 */
90 #define PMRN_UPMLCA0 0x080 /* User PM Local Control A0 */
91 #define PMRN_UPMLCA1 0x081 /* User PM Local Control A1 */
92 #define PMRN_UPMLCA2 0x082 /* User PM Local Control A2 */
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/linux/scripts/
H A DMakefile.userprogs7 user-csingle := $(foreach m, $(userprogs), $(if $($(m)-objs),,$(m)))
10 user-cmulti := $(foreach m, $(userprogs), $(if $($(m)-objs),$(m)))
13 user-cobjs := $(sort $(foreach m, $(userprogs), $($(m)-objs)))
15 user-csingle := $(addprefix $(obj)/, $(user-csingle))
16 user-cmulti := $(addprefix $(obj)/, $(user-cmulti))
17 user-cobjs := $(addprefix $(obj)/, $(user-cobjs))
28 $(user-csingle): $(obj)/%: $(src)/%.c FORCE
35 $(user-cmulti): FORCE
37 $(call multi_depend, $(user-cmulti), , -objs)
42 $(user-cobjs): $(obj)/%.o: $(src)/%.c FORCE
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/linux/arch/m68k/ifpsp060/
H A Dos.S57 | Each IO routine checks to see if the memory write/read is to/from user
60 | for user mode applications.
71 | working in user space
80 | a1 - user destination address
82 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
110 | a0 - user source address
113 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
140 | Read a data byte from user memory.
143 | a0 - user source address
144 | 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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/linux/Documentation/arch/arm/
H A Dsunxi.rst26 * User Manual
28 …http://dl.linux-sunxi.org/A10/A10%20User%20Manual%20-%20v1.20%20%282012-04-09%2c%20DECRYPTED%29.pdf
41 * User Manual
43 http://dl.linux-sunxi.org/A13/A13%20User%20Manual%20-%20v1.2%20%282013-01-08%29.pdf
57 * User Manual
59 http://dl.linux-sunxi.org/A20/A20%20User%20Manual%202013-03-22.pdf
67 * User Manual
69 http://dl.linux-sunxi.org/A23/A23%20User%20Manual%20V1.0%2020130830.pdf
78 * User Manual
80 …http://dl.linux-sunxi.org/A31/A3x_release_document/A31/IC/A31%20user%20manual%20V1.1%2020130630.pdf
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/linux/include/linux/
H A Dipmi.h27 * Opaque type for a IPMI message user. One of these is needed to
48 struct ipmi_user *user; member
57 * be NULL. If the user above is NULL, then this will be the
96 * this is NULL, it will be ignored for the user. Note that you
109 * the user handle will be invalid. The interface may or may
116 /* Create a new user of the IPMI layer on the given interface number. */
120 struct ipmi_user **user);
123 * Destroy the given user of the IPMI layer. Note that after this
125 * callbacks for the user. Thus as long as you destroy all the users
130 void ipmi_destroy_user(struct ipmi_user *user);
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/linux/tools/testing/selftests/namespaces/
H A Dlistns_permissions_test.c58 /* Create user namespace to be unprivileged */ in TEST()
132 * Test that users with CAP_SYS_ADMIN in a user namespace can see
133 * all namespaces owned by that user namespace.
143 .user_ns_id = 0, /* Will be set to our created user namespace */ in TEST()
166 /* Create user namespace - we'll have CAP_SYS_ADMIN in it */ in TEST()
172 /* Get the user namespace ID */ in TEST()
173 fd = open("/proc/self/ns/user", O_RDONLY); in TEST()
186 /* Create several namespaces owned by this user namespace */ in TEST()
191 /* List namespaces owned by our user namespace */ in TEST()
200 * We have CAP_SYS_ADMIN in this user namespace, in TEST()
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/linux/Documentation/misc-devices/
H A Duacce.rst3 Uacce (Unified/User-space-access-intended Accelerator Framework)
9 Uacce (Unified/User-space-access-intended Accelerator Framework) targets to
14 Because of the unified address, hardware and user space of process can
24 | User application (CPU) | | Hardware Accelerator |
48 The user drivers and libraries are called WarpDrive.
60 | | user API | |
61 | WarpDrive library | ------------> | user driver |
96 created when user application open the chrdev. The file descriptor is used
97 as the user handle of the queue.
99 a chrdev to the user space. The user application communicates with the
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/linux/drivers/fsi/
H A Dfsi-sbefifo.c782 static void sbefifo_release_command(struct sbefifo_user *user) in sbefifo_release_command() argument
784 if (is_vmalloc_addr(user->pending_cmd)) in sbefifo_release_command()
785 vfree(user->pending_cmd); in sbefifo_release_command()
786 user->pending_cmd = NULL; in sbefifo_release_command()
787 user->pending_len = 0; in sbefifo_release_command()
793 struct sbefifo_user *user; in sbefifo_user_open() local
795 user = kzalloc_obj(struct sbefifo_user); in sbefifo_user_open()
796 if (!user) in sbefifo_user_open()
799 file->private_data = user; in sbefifo_user_open()
800 user->sbefifo = sbefifo; in sbefifo_user_open()
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/linux/Documentation/networking/dsa/
H A Dconfiguration.rst35 All other corresponding linux interfaces are called user interfaces.
37 The user interfaces depend on the conduit interface being up in order for them
39 interface had to be managed explicitly by the user. Starting with kernel v5.12,
42 - when a DSA user interface is brought up, the conduit interface is
44 - when the conduit interface is brought down, all DSA user interfaces are
56 a user interface
59 another user interface
62 a third user interface
65 A user interface dedicated for upstream traffic
100 # brought up manually before the user ports.
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/linux/net/core/
H A Dpage_pool_user.c19 * pool->user.
24 /* Page pools are only reachable from user space (via netlink) if they are
28 * - user.list: linked to real netdev, netdev: real netdev
30 * - user.list: linked to lo, netdev: lo
33 * - user.list: unhashed, netdev: unknown
48 if (!pool || hlist_unhashed(&pool->user.list) || in netdev_nl_page_pool_get_do()
102 hlist_for_each_entry(pool, &netdev->page_pools, user.list) { in netdev_nl_page_pool_get_dump()
103 if (state->pp_id && state->pp_id < pool->user.id) in netdev_nl_page_pool_get_dump()
106 state->pp_id = pool->user.id; in netdev_nl_page_pool_get_dump()
140 if (nla_put_uint(rsp, NETDEV_A_PAGE_POOL_ID, pool->user in page_pool_nl_stats_fill()
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/linux/Documentation/admin-guide/hw-vuln/
H A Dattack_vector_controls.rst31 User-to-Kernel
34 The user-to-kernel attack vector involves a malicious userspace program
39 If no untrusted userspace applications are being run, such as with single-user
40 systems, consider disabling user-to-kernel mitigations.
43 shown to be exploitable from browser-based sandboxes. User-to-kernel
47 *user-to-kernel mitigations are enabled by default*
51 User-to-User
54 The user-to-user attack vector involves a malicious userspace program attempting
60 user-to-user mitigations.
64 userspace program requires mitigating user-to-kernel attacks as well for
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/linux/fs/smb/server/
H A Dksmbd_netlink.h14 * This is a userspace ABI to communicate data between ksmbd and user IPC
15 * daemon using netlink. This is added to track and cache user account DB
19 * This event is to check whether user IPC daemon is alive. If user IPC
25 * server from the user IPC daemon and to start the server. The global
33 * This event is to get user account info to user IPC daemon.
42 * This event is to send tree disconnect info to user IPC daemon.
45 * This event is to send logout request to user IPC daemon.
56 * This event is to get user account extension info to user IPC daemon.
67 * IPC heartbeat frame to check whether user IPC daemon is alive.
131 * IPC user login request.
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/linux/drivers/staging/greybus/Documentation/firmware/
H A Dfirmware-management57 and user first needs to identify the character device used for
61 be used by the user to identify the right character device for it. The class
80 Following are the IOCTLs and their data structures available to the user:
142 This ioctl shall be used by the user to get the version and firmware-tag of
148 This ioctl shall be used by the user to get the version of a currently
149 running Backend Interface Firmware identified by a firmware-tag. The user is
156 This ioctl shall be used by the user to load an Interface Firmware package on
157 an Interface. The user needs to fill the 'firmware_tag' and 'load_method'
163 This ioctl shall be used by the user to request an Interface to update a
164 Backend Interface Firmware. The user is required to fill the 'firmware_tag'
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/linux/security/keys/
H A Dkey.c47 * Get the key quota record for a user, allocating a new record if one doesn't
52 struct key_user *candidate = NULL, *user; in key_user_lookup() local
60 /* search the tree for a user record with a matching UID */ in key_user_lookup()
63 user = rb_entry(parent, struct key_user, node); in key_user_lookup()
65 if (uid_lt(uid, user->uid)) in key_user_lookup()
67 else if (uid_gt(uid, user->uid)) in key_user_lookup()
75 /* allocate a candidate user record if we don't already have in key_user_lookup()
79 user = NULL; in key_user_lookup()
90 /* if we get here, then the user record still hadn't appeared on the in key_user_lookup()
104 user in key_user_lookup()
119 key_user_put(struct key_user * user) key_user_put() argument
229 struct key_user *user = NULL; key_alloc() local
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/linux/Documentation/dev-tools/
H A Dcontainer.rst14 problems once and for all (e.g. user id management). It also makes it easier
54 User id to use inside the container.
56 If the ``-g`` option is not specified, the user id will also be used for
71 It's entirely up to the user to choose which image to use and the ``CMD``
74 working directory and adjust the user and group id as needed.
77 provided by the user and selected via the ``-i`` option. The container runtime
83 By default, commands are run non-interactively. The user can abort a running
111 The local environment file is more useful for user-specific variables added
129 User IDs
133 container runtime. The goal is to run commands as the user invoking the tool.
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/linux/drivers/char/ipmi/
H A Dipmi_msghandler.c41 static struct ipmi_recv_msg *ipmi_alloc_recv_msg(struct ipmi_user *user);
43 struct ipmi_user *user);
158 /* The default maximum number of message a user may have outstanding. */
162 "The most message a user may have outstanding.");
182 * The main "user" data structure.
194 /* The interface this user is bound to. */
206 struct ipmi_user *user; member
273 * but may be changed by the user.
317 /* Commands we got from the user that were invalid. */
323 /* Responses from the MC that were delivered to a user
623 struct ipmi_user *user = container_of(ref, struct ipmi_user, refcount); free_ipmi_user() local
632 release_ipmi_user(struct ipmi_user * user) release_ipmi_user() argument
637 acquire_ipmi_user(struct ipmi_user * user) acquire_ipmi_user() argument
1230 ipmi_create_user(unsigned int if_num,const struct ipmi_user_hndl * handler,void * handler_data,struct ipmi_user ** user) ipmi_create_user() argument
1343 _ipmi_destroy_user(struct ipmi_user * user) _ipmi_destroy_user() argument
1412 ipmi_destroy_user(struct ipmi_user * user) ipmi_destroy_user() argument
1424 ipmi_get_version(struct ipmi_user * user,unsigned char * major,unsigned char * minor) ipmi_get_version() argument
1446 ipmi_set_my_address(struct ipmi_user * user,unsigned int channel,unsigned char address) ipmi_set_my_address() argument
1468 ipmi_get_my_address(struct ipmi_user * user,unsigned int channel,unsigned char * address) ipmi_get_my_address() argument
1490 ipmi_set_my_LUN(struct ipmi_user * user,unsigned int channel,unsigned char LUN) ipmi_set_my_LUN() argument
1512 ipmi_get_my_LUN(struct ipmi_user * user,unsigned int channel,unsigned char * address) ipmi_get_my_LUN() argument
1534 ipmi_get_maintenance_mode(struct ipmi_user * user) ipmi_get_maintenance_mode() argument
1566 ipmi_set_maintenance_mode(struct ipmi_user * user,int mode) ipmi_set_maintenance_mode() argument
1609 ipmi_set_gets_events(struct ipmi_user * user,bool val) ipmi_set_gets_events() argument
1690 ipmi_register_for_cmd(struct ipmi_user * user,unsigned char netfn,unsigned char cmd,unsigned int chans) ipmi_register_for_cmd() argument
1735 ipmi_unregister_for_cmd(struct ipmi_user * user,unsigned char netfn,unsigned char cmd,unsigned int chans) ipmi_unregister_for_cmd() argument
2308 i_ipmi_request(struct ipmi_user * user,struct ipmi_smi * intf,struct ipmi_addr * addr,long msgid,struct kernel_ipmi_msg * msg,void * user_msg_data,void * supplied_smi,struct ipmi_recv_msg * supplied_recv,int priority,unsigned char source_address,unsigned char source_lun,int retries,unsigned int retry_time_ms) i_ipmi_request() argument
2440 ipmi_request_settime(struct ipmi_user * user,struct ipmi_addr * addr,long msgid,struct kernel_ipmi_msg * msg,void * user_msg_data,int priority,int retries,unsigned int retry_time_ms) ipmi_request_settime() argument
2479 ipmi_request_supply_msgs(struct ipmi_user * user,struct ipmi_addr * addr,long msgid,struct kernel_ipmi_msg * msg,void * user_msg_data,void * supplied_smi,struct ipmi_recv_msg * supplied_recv,int priority) ipmi_request_supply_msgs() argument
3549 ipmi_poll_interface(struct ipmi_user * user) ipmi_poll_interface() argument
3572 struct ipmi_user *user; nr_msgs_show() local
3863 struct ipmi_user *user = list_first_entry(&intf->users, ipmi_unregister_smi() local
3949 struct ipmi_user *user = NULL; handle_ipmb_get_msg_cmd() local
4048 struct ipmi_user *user = NULL; handle_ipmb_direct_rcv_cmd() local
4225 struct ipmi_user *user = NULL; handle_lan_get_msg_cmd() local
4337 struct ipmi_user *user = NULL; handle_oem_get_msg_cmd() local
4446 struct ipmi_user *user; handle_read_event_rsp() local
4916 struct ipmi_user *user; smi_work() local
4936 struct ipmi_user *user = msg->user; smi_work() local
5264 ipmi_alloc_recv_msg(struct ipmi_user * user) ipmi_alloc_recv_msg() argument
5301 ipmi_set_recv_msg_user(struct ipmi_recv_msg * msg,struct ipmi_user * user) ipmi_set_recv_msg_user() argument
5356 ipmi_panic_request_and_wait(struct ipmi_user * user,struct ipmi_addr * addr,struct kernel_ipmi_msg * msg) ipmi_panic_request_and_wait() argument
5541 struct ipmi_user *user; panic_event() local
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/linux/arch/powerpc/include/asm/nohash/32/
H A Dmmu-44x.h36 #define PPC44x_TLB_U0 0x00008000 /* User 0 */
37 #define PPC44x_TLB_U1 0x00004000 /* User 1 */
38 #define PPC44x_TLB_U2 0x00002000 /* User 2 */
39 #define PPC44x_TLB_U3 0x00001000 /* User 3 */
47 #define PPC44x_TLB_UX 0x00000020 /* User execution */
48 #define PPC44x_TLB_UW 0x00000010 /* User write */
49 #define PPC44x_TLB_UR 0x00000008 /* User read */
82 #define PPC47x_TLB2_U0 0x00008000 /* User 0 */
83 #define PPC47x_TLB2_U1 0x00004000 /* User 1 */
84 #define PPC47x_TLB2_U2 0x00002000 /* User 2 */
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/linux/arch/loongarch/include/asm/
H A Duaccess.h34 * get_user: - Get a simple variable from user space.
36 * @ptr: Source address, in user space.
38 * Context: User context only. This function may sleep if pagefaults are
41 * This macro copies a single simple variable from user space to kernel
61 * put_user: - Write a simple value into user space.
62 * @x: Value to copy to user space.
63 * @ptr: Destination address, in user space.
65 * Context: User context only. This function may sleep if pagefaults are
68 * This macro copies a single simple value from kernel space to user
86 * __get_user: - Get a simple variable from user spac
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/linux/tools/tracing/rtla/src/
H A Dcommon.c90 * Even if the user do not set a house-keeping CPU, try to in common_apply_config()
91 * move rtla to a CPU set different to the one where the user in common_apply_config()
101 * On kernels without support, user threads will have already failed in run_tool()
232 params->user.should_run = 1; in run_tool()
234 params->user.stopped_running = 0; in run_tool()
236 params->user.set = &params->monitored_cpus; in run_tool()
238 params->user.sched_param = &params->sched_param; in run_tool()
240 params->user.sched_param = NULL; in run_tool()
242 params->user.cgroup_name = params->cgroup_name;
244 retval = pthread_create(&user_thread, NULL, timerlat_u_dispatcher, &params->user); in top_main_loop()
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/linux/Documentation/ABI/testing/
H A Ddebugfs-driver-habanalabs42 Description: Allows the root user to read or write directly through the
46 the generic Linux user-space PCI mapping) because the DDR bar
50 If the IOMMU is disabled, it also allows the root user to read
57 Description: Allows the root user to read or write 64 bit data directly
61 the generic Linux user-space PCI mapping) because the DDR bar
65 If the IOMMU is disabled, it also allows the root user to read
72 Description: Allows the root user to read from the device's internal
77 Linux user-space PCI mapping) because the amount of internal
82 in case it is done while the device is executing user
90 Description: Enables the root user to set the device to specific state.
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