| Commit message (Collapse) | Author | Age | Files | Lines |
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O_NOFOLLOW.
We return [EMLINK] instead of [ELOOP] when trying to open a symlink with
O_NOFOLLOW, so that the original case of [ELOOP] can be distinguished. Code
like cmp -h and xz takes advantage of this.
PR: 214633
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(procctl(PROC_REAP_ACQUIRE)).
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Document thr_suspend(2) and thr_wake(2).
MFC r306506:
Reword the statement.
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Approved by: kib (mentor)
Sponsored by: Dell Technologies
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Do not obliterate errno value in the main thread during ptrace(2) call on x86.
MFC r304931:
Follow ABI when calling __error from the ptrace(2) wrapper.
MFC r305012:
Rewrite ptrace(2) wrappers in C.
MFC r305022:
Restore the requirement of setting errno to zero before calling ptrace(2).
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Typesetting fixes.
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- Avoid double use of "request" in a single sentence. Instead, describe
aio_sigevent as being used to request notification of the associated
operation's completion. This matches the language used to describe
aio_sigevent in aio(4).
- Simplify the prohibition on modifying buffers while requests are in
flight.
- Fix case mismatch.
- Drop note about not using stack variables. C programmers should be able
to figure out if a stack variable is safe based on the later warning
about the life cycle requirements of control blocks.
- Remove prohibition on modifying the I/O buffer for aio_fsync() since
it does not use an I/O buffer. For aio_mlock(), prohibit modifications
to the mapping (e.g. due to mprotect, munmap, mmap, etc.) but do not
prohibit modifications to the memory backing the buffer (stores into
the pages backing the buffer).
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First, PL_FLAG_FORKED events now also set a PL_FLAG_VFORKED flag when
the new child was created via vfork() rather than fork(). Second, a
new PL_FLAG_VFORK_DONE event can now be enabled via the PTRACE_VFORK
event mask. This new stop is reported after the vfork parent resumes
due to the child calling exit or exec. Debuggers can use this stop to
reinsert breakpoints in the vfork parent process before it resumes.
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Add a mask of optional ptrace() events.
302900:
Add a test for user signal delivery.
This test verifies we get the correct ptrace event details when a signal
is posted to a traced process from userland.
302902:
Add a mask of optional ptrace() events.
ptrace() now stores a mask of optional events in p_ptevents. Currently
this mask is a single integer, but it can be expanded into an array of
integers in the future.
Two new ptrace requests can be used to manipulate the event mask:
PT_GET_EVENT_MASK fetches the current event mask and PT_SET_EVENT_MASK
sets the current event mask.
The current set of events include:
- PTRACE_EXEC: trace calls to execve().
- PTRACE_SCE: trace system call entries.
- PTRACE_SCX: trace syscam call exits.
- PTRACE_FORK: trace forks and auto-attach to new child processes.
- PTRACE_LWP: trace LWP events.
The S_PT_SCX and S_PT_SCE events in the procfs p_stops flags have
been replaced by PTRACE_SCE and PTRACE_SCX. PTRACE_FORK replaces
P_FOLLOW_FORK and PTRACE_LWP replaces P2_LWP_EVENTS.
The PT_FOLLOW_FORK and PT_LWP_EVENTS ptrace requests remain for
compatibility but now simply toggle corresponding flags in the
event mask.
While here, document that PT_SYSCALL, PT_TO_SCE, and PT_TO_SCX both
modify the event mask and continue the traced process.
302921:
Rename PTRACE_SYSCALL to LINUX_PTRACE_SYSCALL.
303461:
Note that not all optional ptrace events use SIGTRAP.
New child processes attached due to PTRACE_FORK use SIGSTOP instead of
SIGTRAP. All other ptrace events use SIGTRAP.
304009:
Remove description of P_FOLLOWFORK as this flag was removed.
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292894:
Add ptrace(2) reporting for LWP events.
Add two new LWPINFO flags: PL_FLAG_BORN and PL_FLAG_EXITED for reporting
thread creation and destruction. Newly created threads will stop to report
PL_FLAG_BORN before returning to userland and exiting threads will stop to
report PL_FLAG_EXIT before exiting completely. Both of these events are
only enabled and reported if PT_LWP_EVENTS is enabled on a process.
292896:
Document the recently added support for ptrace(2) LWP events.
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- Add a sigevent(3) manpage to give a general overview of the sigevent
structure and the available notification mechanisms.
- Document that AIO requests contain a nested sigevent structure that can
be used to request completion notification.
- Expand the sigevent details in other manuals to note details such as
the extra values stored in a queued signal's information or in a posted
kevent.
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Mark jail(2), and the sysctls that it (and only it) uses as deprecated.
jail(8) has long used jail_set(2), and those sysctl only cause confusion.
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application code.
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Add EVFILT_VNODE open, read and close notifications.
MFC r298984:
Correct wording.
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Issue NOTE_EXTEND when a directory entry is added to or removed from
the monitored directory as the result of rename(2) operation. The
renames staying in the directory are not reported.
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Explain NOTE_LINK reporting for the directories.
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Provide an example to the kqueue man page, showing
a basic usage example. Although it is an
untypical example for the use of kqueue, it is
better than nothing and should get people started.
PR: 196844
Submitted by: fernando.apesteguia@gmail.com
Reviewed by: kib
Approved by: kib
Differential Revision: https://reviews.freebsd.org/D6082
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Document KTRFAC_FAULT and KTRFAC_FAULTEND.
Obtained from: CheriBSD (9d70f563f1b033e6a9b51eaf3b145a8cbbc6617c)
Sponsored by: DARPA, AFRL
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PR: 206927
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Make libc __pthread_map_stacks_exec() interposed.
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Update the __FreeBSD_version check in lib/libc/sys/futimens.c and
lib/libc/sys/utimensat.c. Before this, fallback code using
futimes/futimesat/lutimes was used except when running on a sufficiently
recent 11-current kernel.
Also, update the history section in the man page.
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Kernel part of reroot support - a way to change rootfs without reboot.
Note that the mountlist manipulations are somewhat fragile, and not very
pretty. The reason for this is to avoid changing vfs_mountroot(), which
is (obviously) rather mission-critical, but not very well documented,
and thus hard to test properly. It might be possible to rework it to use
its own simple root mount mechanism instead of vfs_mountroot().
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D2698
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Add futimens and utimensat system calls.
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Depending on system configuration and parameters, clock_gettime() and
gettimeofday() may not be system calls. If so, passing an invalid pointer
will cause a signal and not an [EFAULT] error.
From a standards perspective, this is OK since passing an invalid pointer is
undefined behaviour.
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Switch pl_child_pid from int to pid_t.
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Export current system call code and argument count for system call entry
and exit events. To preserve the ABI, the new fields are moved to the
end of struct thread in these branches (unlike HEAD) and explicitly copied
when new threads are created. In addition, the new tests are only added
in 10.
r287386:
Export current system call code and argument count for system call entry
and exit events. procfs stop events for system call tracing report these
values (argument count for system call entry and code for system call exit),
but ptrace() does not provide this information. (Note that while the system
call code can be determined in an ABI-specific manner during system call
entry, it is not generally available during system call exit.)
The values are exported via new fields at the end of struct ptrace_lwpinfo
available via PT_LWPINFO.
r288949:
Fix various edge cases related to system call tracing.
- Always set td_dbg_sc_* when P_TRACED is set on system call entry
even if the debugger is not tracing system call entries. This
ensures the fields are valid when reporting other stops that
occur at system call boundaries such as for PT_FOLLOW_FORKS or
when only tracing system call exits.
- Set TDB_SCX when reporting the stop for a new child process in
fork_return(). This causes the event to be reported as a system
call exit.
- Report a system call exit event in fork_return() for new threads in
a traced process.
- Copy td_dbg_sc_* to new threads instead of zeroing. This ensures
that td_dbg_sc_code in particular will report the system call that
created the new thread or process when it reports a system call
exit event in fork_return().
- Add new ptrace tests to verify that new child processes and threads
report system call exit events with a valid pl_syscall_code via
PT_LWPINFO.
r288993:
Document the recently added pl_syscall_* fields in struct ptrace_lwpinfo.
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Avoid adding duplicates into OBJS. bsd.lib.mk already handles adding entries
to OBJS based on SRCS.
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Correct the description of MADV_DONTNEED.
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NetBSD commit log:
Use a constant array for the MIB. Newer LLVM decided that mib[] warranted
stack protections, with the obvious crash after the setup was done.
As a positive side effect, code size shrinks a bit.
I'm not sure why this hasn't bitten us yes, but it is certainly possible and
there are no real drawbacks to this change anyway.
Submitted by: pfg
Obtained from: NetBSD
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Switch libc from using _sig{procmask,action,suspend} symbols, which
are aliases for the syscall stubs and are plt-interposed, to the
libc-private aliases of internally interposed sigprocmask() etc.
MFC r287300:
Use libthr interposed functions instead of syscalls, in posix_spawn()'
child.
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Remove the wrong asserts.
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MFC r284918:
Add helper fill_based_sd(9).
MFC r284919:
Add x86 PT_GETFSBASE, PT_GETGSBASE machine-depended ptrace requests to
obtain the thread %fs and %gs bases. Add x86 PT_SETFSBASE and
PT_SETGSBASE requests to set the bases from debuggers. The set
requests, similarly to the sysarch({I386,AMD64}_SET_FSBASE), override
the corresponding segment registers.
MFC r284965:
Document x86 machine-specific ptrace(2) requests.
MFC r285011:
Disallow a debugger on 64bit system to set fs/gs bases of the 32bit
process beyond the end of the process address space.
MFC r285104:
Grammar and language fixes.
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Fix markup.
Sponsored by: The FreeBSD Foundation
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Reassign copyright statements on several files from Advanced
Computing Technologies LLC to Hudson River Trading LLC.
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Various updates to the ftruncate(2) documentation:
- Note that ftruncate(2) can operate on shared memory objects and cross
reference shm_open(2).
- Note that ftruncate(2) does not change the file position pointer (aka
seek pointer) of the file descriptor.
- ftruncate(2) will fail with EINVAL for all sorts of other fd types than
just sockets, so instead note that it fails for all but regular files and
shared memory objects.
- Note that ftruncate(2) also appeared in 4.2BSD along with truncate(2).
(Or at least the manpage for both appeared in 4.2, I did not check the
kernel code itself to see if either predated 4.2.)
PR: 199472
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Partially revert r255486, the first argument to socketpair() is a socket
domain, not a file descriptor. Use 'domain' instead of the original 'd'
for this argument to match socket(2).
PR: 199491
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vfork() first appeared in 3BSD which pre-dates 2.9BSD. Verified via the
copy of 3BSD on disc 1 of "The CSRG Archives".
PR: 198612
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Update open(2) to make it more obvious that O_NOCTTY and O_TTY_INIT
are ignored.
Sponsored by: The FreeBSD Foundation
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Remove useless comment.
Sponsored by: The FreeBSD Foundation
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Make wait6(2), waitid(3) and ppoll(2) cancellation points.
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r274933 - Ta is only allowed with Bl -column not in Bl -item
r281470 - Remove obsolete bits about maximum number of file systems.
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Make kevent(2) a cancellation point.
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Correctly handle __fcntl_compat symbol for the !SYSCALL_COMPAT case.
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Document [EPERM] for UNIX sockets.
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Update system man pages for s/capability.h/capsicum.h/.
Sponsored by: Google, Inc.
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Unbreak sparc64 after r276630 (MFCed to stable/10 in r277317) by calling
__sparc_sigtramp_setup signal trampoline as part of the MD __sys_sigaction
again.
Submitted by: kib (initial versions)
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Properly interpose libc spinlocks, was missed in r276630.
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