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321146 |
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18-Jul-2017 |
ngie |
MFC r318718,r318719,r318720,r318721:
r318718:
rctl_add_rule(2): fix manlint warnings
- Fix commas (either missing or misused) after .Nm entries in SYNOPSIS
r318719:
open(2): fix manlint warnings
- Sort SEE ALSO .Xr entries. - Sort sections (HISTORY comes after STANDARDS).
r318720:
ptrace(2): clean up trailing whitespace
r318721:
kill(2): add missing section for sysctl(9)
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305341 |
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03-Sep-2016 |
kib |
MFC r304928: 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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305186 |
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01-Sep-2016 |
kib |
MFC r305024: Typesetting fixes.
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304499 |
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19-Aug-2016 |
jhb |
MFC 303001: Add PTRACE_VFORK to trace vfork events.
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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304188 |
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15-Aug-2016 |
jhb |
MFC 302900,302902,302921,303461,304009: 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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304017 |
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12-Aug-2016 |
jhb |
MFC 292894,292896: Add ptrace(2) reporting for LWP events.
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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290464 |
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06-Nov-2015 |
jhb |
MFC 289636: Switch pl_child_pid from int to pid_t.
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289780 |
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22-Oct-2015 |
jhb |
MFC 287386,288949,288993: 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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286311 |
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05-Aug-2015 |
kib |
Implement x86 ptrace(2) requests PT_{GET,SET}{FS,GS}BASE.
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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286311 |
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05-Aug-2015 |
kib |
Implement x86 ptrace(2) requests PT_{GET,SET}{FS,GS}BASE.
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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