6b621d05b3
_exit.2, capget.2, fcntl.2, futex.2, listen.2, memfd_create.2, modify_ldt.2, move_pages.2, open.2, perf_event_open.2, ptrace.2, set_thread_area.2, stime.2, syscall.2, sysctl.2, userfaultfd.2, cmsg.3, exit.3, ftime.3, getpt.3, malloc.3, console_codes.4, loop.4, inotify.7, netlink.7, packet.7, rtnetlink.7, tcp.7, unix.7, vsock.7, ldconfig.8: tstamp
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-02-09 11:53:28 +01:00
1059ffb804
tcp.7: tcp_low_latency is ignored since Linux 4.14
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-02-07 16:11:46 +01:00
863d6b7de0
unix.7: The PID sent with SCM_CREDENTIALS must match an existing process
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-02-05 12:51:51 +01:00
5687d86fa5
inotify.7: Merge late perror() into fprintf()
...
fprintf() may have overridden errno before perror() could print
it in this example.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-01-21 20:45:24 +01:00
91201f28d8
keyrings.7: ffix
...
Signed-off-by: Jakub Wilk <jwilk@jwilk.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-01-21 20:22:27 +01:00
9d7fb78448
epoll.7: wfix
...
Reported-by: John Jones <jmjatlanta@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-01-21 20:20:04 +01:00
0549038d6d
uts_namespaces.7: wfix
...
Reported-by: Sam Varshavchik <mrsam@courier-mta.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-01-21 20:12:43 +01:00
1f294696f6
ipc_namespaces.7: wfix
...
Reported-by: Sam Varshavchik <mrsam@courier-mta.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-01-21 20:12:26 +01:00
a0253f557d
fanotify.7: srcfix
...
Reported-by: Sam Varshavchik <mrsam@courier-mta.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-01-21 20:11:17 +01:00
f7d3e6aac1
sched.7: tfix
...
Reported-by: Will <cassis@tricolore.lu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-01-06 19:42:43 +01:00
ae10667d48
netlink.7: Fix alignment issue in example
...
PVS-Studio reports that in
char buf[8192];
/* ... */
nh = (struct nlmsghdr *) buf,
the pointer 'buf' is cast to a more strictly aligned pointer type.
This is undefined behaviour. One possible solution to make sure
that buf is correctly aligned is to declare buf as an array of
struct nlmsghdr. Other solutions include allocating the array on
the heap, use an union, or stdalign features. With this patch,
the buffer still contains 8192 bytes.
This was raised on Stack Overflow:
https://stackoverflow.com/questions/57745580/netlink-receive-buffer-alignment
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-12-30 19:49:08 +01:00
7aec4106be
rtnetlink.7: ifa_index is an unsigned int
...
See include/linux/if_addr.h.
struct ifaddrmsg {
__u8 ifa_family;
__u8 ifa_prefixlen; /* The prefix length */
__u8 ifa_flags; /* Flags */
__u8 ifa_scope; /* Address scope */
__u32 ifa_index; /* Link index */
};
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-12-30 19:46:45 +01:00
ef0ba060b3
capabilities.7: Minor clarification of historical behavior
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-12-30 11:01:01 +01:00
bafa494386
capabilities.7: wfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-12-30 11:01:01 +01:00
8bdc484e43
packet.7: Add comment noting when 'tp_vlan_tpid' field appeared
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-12-12 09:55:38 +01:00
68d16cd0ae
packet.7: Add missing tpacket_auxdata field (tp_vlan_tpid)
...
The definition of the tpacket_auxdata struct in the manpage is not
the same as the definition found in
/include/uapi/linux/if_packet.h.
In particular, instead of a tp_padding field, there is a
tp_vlan_tpid field. An example of a project using this field is
libpcap[1].
[1]: https://github.com/the-tcpdump-group/libpcap/blob/master/pcap-linux.c#L349
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-12-12 09:55:30 +01:00
d1203f4537
inotify.7: wfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-12-12 09:35:08 +01:00
daf57a6ae0
cgroups.7: Improve the discussion of the advantages of v2 release notification
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-29 13:39:55 +01:00
c309dee7e1
cgroups.7: Describe the cgroup.events "frozen" key
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-29 13:39:55 +01:00
71e2545e90
cgroups.7: Split discussion of cgroups.events file and v2 release notification
...
In preparation for adding a description of the "frozen" key.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-29 13:39:55 +01:00
31261a5dcc
cgroups.7: The v2 freezer controller was added in Linux 5.2
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-29 11:27:48 +01:00
cf4e631c96
vsock.7: Show size of svm_zero field in sockaddr_vm structure
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-21 10:52:14 +01:00
4475e3f07a
vsock.7: Minor tweaks to Mikhail Golubev's patch
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-21 10:52:14 +01:00
552c121013
vsock.7: Add missing structure element
...
The structure 'struct sockaddr_vm' has additional element
'unsigned char svm_zero[]' since version v3.9-rc1
(include/uapi/linux/vm_sockets.h). Linux kernel checks that this
element is zeroed (net/vmw_vsock/vsock_addr.c). Reflect this on
the vsock man page.
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=205583
Signed-off-by: Mikhail Golubev <Mikhail.Golubev@opensynergy.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-21 10:52:14 +01:00
324f6154f4
Removed trailing white space at end of lines
2019-11-19 15:31:20 +01:00
e46733c47e
bpf-helpers.7: tfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-19 15:31:20 +01:00
a5409de92c
clone.2, fallocate.2, ioctl_iflags.2, ioctl_list.2, pidfd_open.2, pivot_root.2, quotactl.2, seccomp.2, select.2, wait.2, proc.5, cgroups.7, netdevice.7, uts_namespaces.7: tstamp
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-19 15:31:20 +01:00
edca873239
bpf-helpers.7: Fix .TH line
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-19 12:50:47 +01:00
29965ffceb
bpf-helpers.7: srcfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-19 12:39:37 +01:00
e6107b296a
bpf-helpers.7: Refresh against kernel v5.4-rc7
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-19 12:36:56 +01:00
4791ea7fda
uts_namespaces.7: Add a little more detail on scope of UTS namespaces
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-09 09:09:18 +01:00
49cb13ca52
signal-safety.7: ffix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-05 10:38:54 +01:00
a1b3319b7c
netdevice.7: Small wording fix in description of SIOCGIFCONF
...
SIOCGIFCONF returns "network layer" addresses (not "transport
layer").
Reported-by: Silviu Popescu <silviupopescu1990@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-11-05 09:25:21 +01:00
1191b4e7b2
netlink.7: tfix
...
Signed-off-by: Jakub Wilk <jwilk@jwilk.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-31 06:21:50 +01:00
897367f900
unix.7: tfix
...
In the given example, the second recvmsg(2) call should receive four bytes,
as the third sendmsg(2) call only sends four.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-31 06:18:30 +01:00
6a14132925
unix.7: tfix
...
Signed-off-by: Torin Carey <torin@tcarey.uk>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-31 06:18:19 +01:00
640453bbea
cgroups.7: Switch to "considerate language"
...
Thanks-to: https://twitter.com/expensivestevie
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-28 14:32:07 +01:00
bce2cf9805
mount_namespaces.7: tfix
...
Remove duplicated word.
Signed-off-by: Jakub Wilk <jwilk@jwilk.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-11 23:45:12 +02:00
867c9b3408
localedef.1, close.2, copy_file_range.2, execve.2, get_robust_list.2, getdomainname.2, gethostname.2, inotify_add_watch.2, io_submit.2, ioctl_fideduperange.2, kcmp.2, kill.2, mmap.2, move_pages.2, perf_event_open.2, ptrace.2, rt_sigqueueinfo.2, sched_setaffinity.2, sched_setparam.2, setns.2, sigaction.2, signalfd.2, statx.2, syscall.2, syscalls.2, uname.2, write.2, errno.3, fexecve.3, getauxval.3, printf.3, pthread_mutex_consistent.3, pthread_mutexattr_init.3, pthread_mutexattr_setrobust.3, pthread_setcancelstate.3, regex.3, strtok.3, strtol.3, ttyname.3, smartpqi.4, core.5, resolv.conf.5, man-pages.7, mq_overview.7, operator.7, pthreads.7, signal-safety.7, sysvipc.7: Update timestamp
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-11 10:45:02 +02:00
86fd6bad0a
signal.7: SEE ALSO: add pidfd_send_signal(2)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-10 12:24:28 +02:00
ee81d7e418
namespaces.7: Include manual page references in the summary table of namespace types
...
Make the page more compact by removing the stub subsections that
list the manual pages for the namespace types. And while we're
here, add an explanation of the table columns.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-09 08:59:22 +02:00
4d75df3711
mount_namespaces.7: tfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-09 08:25:04 +02:00
19416046c5
mount_namespaces.7: Tweak discussion of "less privileged" mount namespace
...
Eric Biederman:
I hate to nitpick, but I am going to say that when I read
the text above the phrase "mount namespace of the process
that created the new mount namespace" feels wrong.
Either you use unshare(2) and the mount namespace of the
process that created the mount namespace changes.
Or you use clone(2) and you could argue it is the new child
that created the mount namespace.
Having a different mount namespace at the end of the
creation operation feels like it makes your phrase confusing
about what the starting mount namespace is. I hate to use
references that are ambiguous when things are changing.
Reported-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-08 23:30:55 +02:00
534755eed9
mount_namespaces.7: Explain how a namespace's mount point list is initialized
...
Provide a more detailed explanation of the initialization of
the mount point list in a new mount namespace.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-08 22:51:59 +02:00
ed425459c5
mount_namespaces.7: tfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-08 16:26:15 +02:00
a0c9733194
mount_namespaces.7: Clarify description of "less privileged" mount namespaces
...
The current text talks about "parent mount namespaces", but there
is no such concept. As confirmed by Eric Biederman, what is mean
here is "the mount namespace this mount namespace started as a
copy of". So, this change writes up Eric's description in a more
detailed way.
Reported-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-08 16:20:59 +02:00
a2fc45a9f8
mount_namespaces.7: It may be desirable to disable propagation after creating a namespace
...
After creating a new mount namespace, it may be desirable to
disable mount propagation. Give the reader a more explicit
hint about this.
Reported-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-07 12:11:30 +03:00
0b6cf5d26e
pthreads.7: Minor tweaks to Carlos O'Donell's patch
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-05 14:54:24 +03:00
50639a2a18
pthread_setcancelstate.3, pthreads.7: srcfix: wrap source lines at sentence boundaries
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-05 14:54:15 +03:00
dbb01cbbdb
pthread_setcancelstate.3, pthreads.7, signal-safety.7: Describe issues with cancellation points in signal handlers
...
In a recent conversation with Mathieu Desnoyers I was reminded
that we haven't written up anything about how deferred
cancellation and asynchronous signal handlers interact. Mathieu
ran into some of this behaviour and I promised to improve the
documentation in this area to point out the potential pitfall.
Thoughts?
8< --- 8< --- 8<
In pthread_setcancelstate.3, pthreads.7, and signal-safety.7 we
describe that if you have an asynchronous signal nesting over a
deferred cancellation region that any cancellation point in the
signal handler may trigger a cancellation that will behave
as-if it was an asynchronous cancellation. This asynchronous
cancellation may have unexpected effects on the consistency of
the application. Therefore care should be taken with asynchronous
signals and deferred cancellation.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-10-05 14:54:02 +03:00
27f942adbc
sched_setparam.2, pthread_mutexattr_init.3, pthread_mutexattr_setrobust.3, pthread_mutex_consistent.3, strtol.3, sched.7, uts_namespaces.7: SEE ALSO: correct list order
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-09-27 14:18:46 +02:00
c148832982
veth.4, persistent-keyring.7, process-keyring.7, session-keyring.7, thread-keyring.7, user-keyring.7, user-session-keyring.7: srcfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-09-27 14:18:46 +02:00
43d438e29b
mount_namespaces.7: SEE ALSO: refer to example in pivot_root(2)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-09-23 13:11:19 +02:00
cc245e5bf8
operator.7: Prefix and postfix ++/-- have different precedences
...
Harbison and Steele also agree on this.
Reported-by: Rick Stanley <rstanley@rsiny.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-09-22 22:58:45 +02:00
4dfeb670df
man-pages.7: Relocate and enhance the text on semantic newlines
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-09-13 15:39:04 +02:00
724ca69c82
man-pages.7: Paragraphs should not be separated by blank lines
...
Reported-by: Paul Wise <pabs3@bonedaddy.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-09-13 15:26:13 +02:00
8f397fb4a1
fanotify.7: tfix
...
Signed-off-by: Jakub Wilk <jwilk@jwilk.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-09-10 12:45:14 +02:00
96f49e54da
signal.7: tfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-28 11:58:00 +02:00
15f2303db3
cgroups.7: tfix
...
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
d6094c8a3b
capabilities.7: tfix
...
Hi Michael, it's been a while but few simple patches today..
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
8a6c2ad5a8
user_namespaces.7: tfix
...
This and the previous were the only ones grep found.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
252bba449e
uts_namespaces.7: SEE ALSO: add gethostname(2), getdomainname(2), uname(2)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
30e022e516
namespaces.7: Remove content migrated to uts_namespaces(7)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
57829a0e87
uts_namespaces.7: New page with content migrated from namespaces(7)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
ab1dc74922
mq_overview.7: wfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
c4279d2660
mq_overview.7, sysvipc.7: Adjust references to namespaces(7) to ipc_namespaces(7)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
25e96f04bc
namespaces.7: Remove content migrated to new ipc_namespaces(7) page
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
1d36b4e17b
ipc_namespaces.7: New page with content migrated from namespaces(7)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:49 +02:00
3b9d44099f
signal.7: Enhance the text on process-directed and thread-directed signals
...
clone(2) has a good description of these concepts; borrow
from it liberally.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 23:14:42 +02:00
96e472175c
signal.7: tfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-26 21:45:13 +02:00
18b028be2d
user_namespaces.7: Improve explanation of meaning of ownership of nonuser namespaces
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-20 09:56:33 +02:00
7e7e8de32e
capabilities.7: CAP_SYS_ADMIN allows modifying autogroup nice values
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-02 13:57:10 +02:00
63121bd499
pldd.1, bpf.2, chdir.2, clone.2, fanotify_init.2, fanotify_mark.2, intro.2, ipc.2, mount.2, mprotect.2, msgctl.2, msgget.2, msgop.2, pivot_root.2, pkey_alloc.2, poll.2, prctl.2, semctl.2, semget.2, semop.2, setxattr.2, shmctl.2, shmget.2, shmop.2, tkill.2, dlopen.3, exec.3, ftok.3, getutent.3, on_exit.3, strcat.3, cpuid.4, proc.5, capabilities.7, cgroup_namespaces.7, credentials.7, fanotify.7, mount_namespaces.7, namespaces.7, sched.7, signal.7, socket.7, unix.7, user_namespaces.7, vdso.7, xattr.7, ld.so.8: tstamp
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-08-02 08:34:32 +02:00
fd6307c47f
mount_namespaces.7: ffix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-30 08:25:37 +02:00
2f368cc328
sched.7: SEE ALSO: add pthread_getschedparam(3)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-30 08:25:37 +02:00
40ca38806d
capabilities.7: Add pivot_root(2) to CAP_SYS_ADMIN list
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-28 13:34:28 +02:00
dc95a3a39f
mount_namespaces.7: Clarify implications for other NS if mount point is removed in one NS
...
If a mount point is deleted or renamed or removed in one mount
namespace, this will cause an object that is mounted at that
location in another mount namespace to be unmounted (as verified
by experiment). This was implied by the existing text, but it is
better to make this detail explicit.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-24 07:11:35 +02:00
930e2ffac4
namespaces.7: srcfix
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-23 21:42:58 +02:00
e70abf48ff
mount_namespaces.7: SEE ALSO: add pivot_root(2), pivot_root(8)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-22 20:59:38 +02:00
ae4452ab98
namespaces.7: Note initial values of hostname and domainname in a new UTS namespace
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-20 23:50:50 +02:00
3b13efed75
capabilities.7: Add a note about using strace on binaries that have capabilities
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-17 04:19:01 +02:00
705ac54d0f
signal.7: Minor text rework
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-13 12:18:08 -06:00
9b6aa9d133
signal.7: Some reworking of Michal Sekletar's text
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-13 12:15:32 -06:00
cd9b34fc58
signal.7: Relocate Michal Sekletar's text
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-13 11:49:04 -06:00
e447e5bad3
signal.7: Clarify that siginfo_t isn't changed on coalescing
...
Confirmed by experiment by mtk:
$ cat siginfo_nonqueuing.c
} while (0)
static void
grimReaper(int sig, siginfo_t *si, void *ucontext)
{
printf("caught signal %d\n", sig);
printf(" si_pid=%ld, si_uid=%ld, si_status=%d\n",
(long) si->si_pid, (long) si->si_uid, si->si_status);
}
static void
child(int sleepTime, uid_t uid, int status)
{
switch (fork()) {
case -1:
errExit("fork");
case 0:
sleep(sleepTime);
if (geteuid() == 0)
setuid(uid);
printf("Child %ld with UID %ld exiting with status %d\n",
(long) getpid(),(long) getuid(), status);
exit(status);
default:
return;
}
}
int
main(int argc, char *argv[])
{
struct sigaction sa;
sigset_t blocking;
sa.sa_sigaction = grimReaper;
sa.sa_flags = SA_SIGINFO;
sigemptyset(&sa.sa_mask);
if (sigaction(SIGCHLD, &sa, NULL) == -1)
errExit("sigaction");
sigemptyset(&blocking);
sigaddset(&blocking, SIGCHLD);
if (sigprocmask(SIG_BLOCK, &blocking, NULL) == -1)
errExit("sigprocmask");
child(2, 20000, 20);
child(3, 30000, 30);
child(1, 10000, 10);
sleep(5);
if (sigprocmask(SIG_UNBLOCK, &blocking, NULL) == -1)
errExit("sigprocmask");
exit(EXIT_SUCCESS);
}
$ ./siginfo_nonqueuing
Child 4042 with UID 1000 exiting with status 10
Child 4040 with UID 1000 exiting with status 20
Child 4041 with UID 1000 exiting with status 30
caught signal 17
si_pid=4042, si_uid=1000, si_status=10
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Lennart Poettering <lennart@poettering.net>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Michal Sekletar <msekleta@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-13 11:44:12 -06:00
c7871135df
signal.7: Add subsection on queuing and delivery semantics for standard signals
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-13 11:44:12 -06:00
ed33c6886c
credentials.7: Note that /proc/PID/status shows a process's credentials
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-10 15:44:47 +02:00
aa16684c95
signal.7: Various fields in /proc/PID/status show signal-related information
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-10 15:19:31 +02:00
b8cf6c2435
user_namespaces.7: Minor rewordings of recently added text
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-02 10:09:24 +02:00
89a0bd8283
user_namespaces.7: Minor wording fix to recently added text
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-02 06:20:44 +02:00
43f4bec190
user_namespaces.7: Describe the effect of file-related capabilities inside use namespaces
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-01 12:18:44 +02:00
ea8ec5785c
user_namespaces.7: Describe how kernel treats UIDs/GIDs when a process access to files
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-01 11:11:19 +02:00
c99eb2b204
capabilities.7: CAP_FOWNER also allows modifying user xattrs on sticky directories
...
See fs/xattr.c::xattr_permission()"
/*
* In the user.* namespace, only regular files and directories can have
* extended attributes. For sticky directories, only the owner and
* privileged users can write attributes.
*/
if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) {
if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
return (mask & MAY_WRITE) ? -EPERM : -ENODATA;
if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
(mask & MAY_WRITE) && !inode_owner_or_capable(inode))
return -EPERM;
}
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-01 09:59:37 +02:00
fc8d1db1b4
xattr.7: s/extended system attributes/system extended attributes/
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-01 09:59:06 +02:00
b25d3e704c
xattr.7: wfix: s/extended user attributes/user extended attributes/
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-07-01 09:59:06 +02:00
e2340cf748
unix.7: Note SCM_RIGHTS interaction with RLIMIT_NOFILE
...
If the file descriptors received in SCM_RIGHTS would cause
the process to its exceed RLIMIT_NOFILE limit, the excess
FDs are discarded.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-06-29 22:13:25 +02:00
015f61c72a
svipc.7: Add old name of sysvipc(7) page as a link
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-06-25 06:39:05 +02:00
343cdc5ac9
clone.2, intro.2, ipc.2, msgctl.2, msgget.2, msgop.2, semctl.2, semget.2, semop.2, shmctl.2, shmget.2, shmop.2, ftok.3, proc.5, namespaces.7: Change reference to svipc(7) to sysvipc(7)
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-06-25 06:38:01 +02:00
880c105e22
sysvipc.7: Minor fixes for page renaming
...
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-06-25 06:33:16 +02:00
0587dba23b
sysvipc.7: Rename svipc.7 to sysvipc.7
...
The name sysvipc is a bit more natural, and is the name used in
/proc/sysvipc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2019-06-25 06:31:50 +02:00
Michael Kerrisk