1 Noteworthy changes in release ?.?? (????-??-??)
2 ===============================================
4 Noteworthy changes in release 4.19 (2017-09-05)
5 ===============================================
8 * Changed formatting of personality names on tile architecture in order
9 to make it in line with other multi-personality architectures.
10 * Changed field output order in struct v4l2_requestbuffers to improve in/out
12 * Changed handling of multiple signal= specifications in an injection
13 expression: multiple specification now leads to error instead of implicit
14 usage the last specification.
17 * Enhanced decoding of optlen argument of getsockopt syscall.
18 * Enhanced decoding of SO_LINGER option of getsockopt and setsockopt syscalls.
19 * Enhanced decoding of SO_PEERCRED option of getsockopt syscall.
20 * Enhanced decoding of IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP,
21 IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
22 IPV6_LEAVE_ANYCAST, MCAST_JOIN_GROUP, and MCAST_LEAVE_GROUP options
23 of setsockopt syscall.
24 * Enhanced decoding of KEYCTL_DH_COMPUTE operation of keyctl syscall
25 (KDF parameters decoding).
26 * Implemented decoding of KEYCTL_RESTRICT_KEYRING operation of keyctl syscall.
27 * Enhanced decoding of UFFDIO_API ioctl command.
28 * Enhanced decoding of BPF_PROG_LOAD, BPF_MAP_CREATE, BPF_MAP_LOOKUP_ELEM,
29 and BPF_MAP_GET_NEXT_KEY commands of bpf syscall.
30 * Implemented decoding of linux socket filter programs specified
31 for SO_ATTACH_FILTER and SO_ATTACH_REUSEPORT_CBPF socket options.
32 * Implemented decoding of inet_diag_req_v2, inet_diag_req_compat,
33 packet_diag_msg, and smc_diag_msg netlink attributes of NETLINK_SOCK_DIAG.
34 * Implemented NETLINK_SELINUX protocol specific decoding.
35 * Implemented decoding of netlink message ack flags.
36 * Implemented decoding of nlmsgerr netlink attributes.
37 * Implemented basic protocol specific decoding of NETLINK_CRYPTO.
38 * Implemented decoding of crypto_user_alg netlink attributes
40 * Implemented basic protocol specific decoding of addr, addrlabel, dcb, link,
41 mdb, neigh, neightbl, netconf, nsid, route, rule, tc, and tca messages
43 * Implemented decoding of NETLINK_KOBJECT_UEVENT messages.
44 * Improved handling of unexpected tracees (the ones that cloned with
45 CLONE_PARENT/CLONE_PTRACE or called PTRACE_TRACEME on themselves): they
46 are now PTRACE_DETACH'ed instead of PTRACE_CONT'ed.
47 * Updated lists of BPF_*, KEY_*, RWF_*, SCM_*, SO_*, and *_MAGIC constants.
48 * Added decoding of arch_prctl syscall on x86.
49 * Added decoding of seccomp, bpf, userfaultfd, membarrier, mlock2,
50 copy_file_range, preadv2, pwritev2, and statx on alpha.
51 * Added decoding of statx syscall on microblaze.
52 * Added decoding of s390_guarded_storage syscall on s390.
53 * Updated lists of ioctl commands from Linux 4.13.
54 * Enhanced manual page.
57 * Fixed printing of group_req structure on non-native personalities.
58 * Fixed output formatting of blkpg_ioctl_arg, dm_name_list, and iocb
60 * Fixed formatting of nul-terminated strings which have kernel-imposed size
62 * Fixed printing of paths that hit PATM_MAX limit in order to match kernel's
64 * Fixed build warnings on Android mips64.
65 * Fixed unused function "is_negated_errno" build warning when built
67 * Fixed syscall number and arguments retrieval behaviour on sparc64 and
68 mips o32 after prctl(PR_SET_DUMPABLE, 0) makes PTRACE_PEEKTEXT impossible
69 to use if Linux kernel has commit v4.10-rc1~114^2~2.
70 * Fixed path tracing for execveat, symlink, symlinkat, inotify_add_watch,
71 and inotify_init syscalls.
72 * Fixed personality switch printing on sparc64 and risc-v.
74 Noteworthy changes in release 4.18 (2017-07-05)
75 ===============================================
78 * Implemented decoding of SCM_TIMESTAMP* control messages.
79 * Implemented decoding of netlink NLMSG_DONE messages.
80 * Implemented decoding of netlink generic nlmsg_type and nlmsg_flags.
81 * Implemented decoding of NETLINK_AUDIT, NETLINK_NETFILTER, NETLINK_ROUTE,
82 NETLINK_SELINUX, NETLINK_SOCK_DIAG, and NETLINK_XFRM message types.
83 * Implemented decoding of NETLINK_GENERIC protocol families.
84 * Implemented basic protocol specific decoding of AF_INET, AF_INET6,
85 AF_NETLINK, AF_PACKET, AF_SMC, and AF_UNIX messages of NETLINK_SOCK_DIAG.
86 * Implemented basic decoding of netlink attributes.
87 * Implemented basic protocol specific decoding of AF_INET, AF_NETLINK,
88 AF_PACKET, AF_SMC, and AF_UNIX netlink attributes of NETLINK_SOCK_DIAG.
89 * Implemented decoding of inet_diag_msg, netlink_diag_msg, and unix_diag_msg
90 netlink attributes of NETLINK_SOCK_DIAG.
91 * Updated lists of ARPHRD_*, KEYCTL_*, NDIAG_SHOW_*, RTM_*, SCM_*, SCTP_*,
92 SO_*, V4L2_*, and prctl ARCH_* constants.
93 * Updated lists of ioctl commands from Linux 4.12.
96 * In interactive mode (-I2), those signals that were blocked at startup
97 will remain blocked for the whole period of strace execution.
98 * strace no longer resets SIGCHLD handler in tracees to the default action.
99 * When traced command is terminated by a blocked signal, strace unblocks
100 that signal to ensure its own termination with the same signal.
101 * Fixed corner cases in decoding of old sigaction syscall.
102 * Fixed build with old kernel headers on mips.
103 * Fixed build on aarch64 and tile with glibc >= 2.26.
104 * Fixed build on arc and nios2.
106 Noteworthy changes in release 4.17 (2017-05-24)
107 ===============================================
109 * Changes in command line syntax
110 * Syscall classes specified in -e trace= option now have % prefix (like
111 -e trace=%process). Old style class names without leading % are still
112 supported, but considered deprecated now.
115 * Optimized syscall filtering.
116 * Improved representation of timestamps.
117 * Enhanced decoding of sched_setattr syscall.
118 * Added -e trace=%stat option for tracing variants of stat syscall.
119 * Added -e trace=%lstat option for tracing variants of lstat syscall.
120 * Added -e trace=%fstat option for tracing variants of fstat and fstatat
122 * Added -e trace=%%stat option for tracing syscalls used for querying file
123 status information (stat, lstat, fstat, fstatat, statx, and their
125 * Added -e trace=%statfs option for tracing statfs, statfs64 and statvfs
127 * Added -e trace=%fstatfs option for tracing fstatfs, fstatfs64 and fstatvfs
129 * Added -e trace=%%statfs option for tracing syscalls used for querying file
130 system statistics information (statfs-like, fstatfs-like and ustat).
131 * Added -e trace=/regex option for filtering syscalls using regular
133 * Added support for prepending of question mark before syscall qualification
134 in -e trace expressions in order to suppress error in case no syscalls
135 matched the provided qualification.
136 * Implemented decoding of signal mask in rt_sigreturn syscall on alpha, arc,
137 arm, avr32, bfin, cris, hppa, m68k, metag, microblaze, mips, nios2, or1k,
138 powerpc, powerpc64, riscv, sh, sh64, sparc, sparc64, tile, x86, and xtensa
140 * Implemented decoding of statx syscall.
141 * Implemented decoding of NS_* ioctl commands.
142 * Implemented decoding of the remaining V4L2_BUF_TYPE_* types.
143 * Implemented decoding of VIDIOC_[SG]_TUNER ioctl commands.
144 * Implemented decoding of NLMSG_ERROR netlink messages.
145 * Improved decoding of BPF_PROG_ATTACH command of bpf syscall.
146 * Improved decoding of misplaced parts in DM_* ioctl commands.
147 * Updated lists of ioctl commands from Linux 4.11.
150 * Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
151 * Fixed the number of arguments and tracing flags of alpha specific syscalls.
152 * Fixed decoding of old sigsuspend syscall on alpha, cris, mips, powerpc,
153 powerpc64, sh, sh64, sparc, and sparc64.
154 * Fixed decoding of sgetmask and ssetmask syscalls on 64-bit architectures.
155 * Fixed decoding of netlink messages received within struct msghdr.
156 * Worked around a bug in miscompiled aarch64 kernels leading to the 3rd
157 argument of sched_getattr syscall being not quite 32-bit.
158 * Fixed corner cases of printing inaccessible times argument of utimes
159 and futimesat syscalls.
161 Noteworthy changes in release 4.16 (2017-02-14)
162 ===============================================
165 * Implemented syscall return value injection (-e inject=SET:retval= option).
166 * Implemented signal injection (-e inject=SET:signal= option).
167 * Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
168 * Implemented decoding of all SG_* ioctl commands.
169 * Implemented decoding of ustat syscall.
170 * Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
171 and BPF_PROG_DETACH commands of bpf syscall.
172 * Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
173 * Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
175 * Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
176 * Updated lists of IP_*, IPV6_*, and LOOP_* constants.
177 * Updated lists of ioctl commands from Linux 4.10.
178 * Added decoding of recently added syscalls on avr32, microblaze, ppc,
182 * Fixed pathmatch of oldselect syscall on 64-bit architectures.
183 * Fixed decoding of mmap2 syscall on s390 when arguments are not available.
184 * Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
185 and pwritev* syscalls on x32.
186 * Fixed printing of string arguments of getxattr and setxattr syscalls
187 when -s option is used to limit the printed string size.
188 * Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
190 * Fixed decoding of SG_* and LOOP_* ioctl commands.
191 * Fixed build on mips with musl libc.
192 * Fixed cross-building of ioctlsort.
193 * Applied minor formatting fixes to the manual page.
195 Noteworthy changes in release 4.15 (2016-12-14)
196 ===============================================
198 * Changes in behavior
199 * Time stamps are now printed according to ISO 8601.
200 * Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
201 * The last argument of mincore, sched_getaffinity, and sched_setaffinity
202 syscalls is now formatted as an array.
205 * Implemented syscall fault injection (-e fault=... option).
206 * Implemented decoding of DM_* ioctl commands.
207 * Implemented decoding of attr parameter of perf_event_open syscall.
208 * Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
209 * Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
210 * Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
212 * Implemented PTRACE_GETREGS API support on m68k.
213 * Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
214 and V4L2_* constants.
215 * Updated lists of ioctl commands from Linux 4.9.
216 * Added decoding of recently added syscalls on arc, x32, and xtensa.
217 * Enhanced manual page.
220 * Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
221 getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
222 mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
223 name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
224 setgroups, setns, unshare, and utimes syscalls.
225 * Fixed handling of verbose flag in printing of controls array
226 of struct v4l2_ext_controls.
227 * Fixed omission of field names in the output of capability, sigaction,
228 sigevent, statfs, timespec, timeval, and utimbuf structures.
229 * Fixed printing of unknown syscalls in siginfo structure.
230 * Fixed decoding of ioctl constants on m68k.
231 * Fixed cris architecture support.
232 * Fixed cross build when host compiler does not support the same
233 set of warning flags as the cross compiler.
234 * Fixed build on SLE10 and SLE11.
236 Noteworthy changes in release 4.14 (2016-10-04)
237 ===============================================
239 * Changes in behavior
240 * When using -p option without a command and no processes has been attached,
241 strace exits with exit status 1.
244 * Added printing of the mode argument of open and openat syscalls
245 when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
246 * Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
247 * Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
248 and aio family syscalls.
249 * Implemented fetching of the 7th subcall argument on mips o32.
250 * Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
252 * Updated lists of ioctl commands from Linux 4.8.
253 * Added decoding of new syscalls on sh and sh64.
254 * Added RISC-V architecture support.
257 * Marked io_setup and io_destroy as memory mapping related syscalls.
258 * Fixed leakage of placeholder descriptors to tracees.
259 * Fixed printing of mode_t, umode_t, and umask types.
260 * Fixed decoding of iovec arrays without a limit on total data size.
261 * Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
262 and ipc family syscalls.
263 * Fixed decoding of invalid syscalls mapped to indirect subcalls.
264 * Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
266 * Fixed decoding of PTRACE_DETACH on sparc and sparc64.
267 * Fixed decoding of struct stat64 on sparc64.
268 * Fixed decoding of uid and gid-related syscalls on sparc64.
269 * Fixed decoding of the forth argument of semctl syscall on sparc64.
270 * Fixed values of tty ioctl constants on sparc64.
271 * Fixed sparc personality support on sparc64.
273 Noteworthy changes in release 4.13 (2016-07-26)
274 ===============================================
277 * Implemented a general netlink socket parser.
278 * Enhanced decoding of socket addresses.
279 * Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
280 * Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
281 ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
282 * Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
283 and *_MAGIC constants.
284 * Updated lists of ioctl commands from Linux 4.7.
287 * Fixed decoding of pid_t argument of prlimit64 syscall.
288 * Fixed sign extension issues in the parser of struct rusage.
289 * Fixed race condition in decoding of timeout argument of recvmmsg and
290 rt_sigtimedwait syscalls.
291 * Fixed build with fresh linux kernel headers.
293 Noteworthy changes in release 4.12 (2016-05-31)
294 ===============================================
297 * Implemented simultaneous use of -p option and tracing of a command.
298 (addresses Debian bug #549942).
299 * Implemented caching of netlink conversations to reduce amount of time
300 spent in decoding socket details in -yy mode.
301 * Implemented -yy mode decoding of protocol:portid pairs associated with
302 netlink socket descriptors.
303 * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
304 * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
306 * Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
307 * Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
308 * Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
309 getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
310 mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
311 rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
312 sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
313 statfs64, tgkill, waitid, and xattr family syscalls.
314 * Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
315 * Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
316 * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
317 * Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
318 * Added decoding of fadvise64 and fadvise64_64 on s390.
319 * Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
320 MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
321 * Updated lists of ioctl commands from Linux 4.6.
324 * Fixed build on arc, metag, nios2, or1k, and tile architectures.
325 * Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
326 * Fixed decoding of mlock2 syscall on sparc.
327 * Fixed decoding of osf_shmat syscall on alpha.
328 * Fixed decoding of syscalls unknown to the kernel on s390/s390x.
329 (addresses Debian bug #485979 and Fedora bug #1298294).
330 * Fixed decoding of preadv syscall in case of short read.
331 * Fixed decoding and dumping of readv syscall in case of short read.
332 * Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
333 * Fixed decoding of mincore syscall's last argument.
334 * Fixed remaining errors in mapping between syscall numbers and numbers
335 of syscall arguments.
336 * Applied various fixes to strace-graph script.
338 Noteworthy changes in release 4.11 (2015-12-21)
339 ===============================================
341 * Changes in behavior
342 * Some syscalls have different names depending on architecture and
343 personality. In these cases, syscall filtering and printing now
344 consistently uses the names that match corresponding __NR_* kernel
345 macros of the tracee's architecture and personality.
346 * Added strace prefix to all diagnostic messages.
349 * Enhanced and extended test suite.
350 * Implemented reliable tracing of processes whose personality differs
351 from the personality of strace, fixed decoding of 32-bit personality
352 syscalls on 64-bit architectures.
353 * When some data referenced by syscall arguments is irrelevant or cannot
354 be read from tracee's memory, strace now prints its address consistently.
355 * When a syscall is restarted using restart_syscall mechanism, strace now
356 shows the syscall name on architectures that expose this information.
357 * Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
358 inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
359 socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
360 F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
361 * Optimized decoding of indirect socket syscalls.
362 * Implemented decoding of nanoseconds along with seconds in stat family
363 syscalls (addresses Fedora bug #1251176).
364 * Implemented decoding of struct statfs.f_flags in statfs syscall.
365 * Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
367 * Implemented decoding of indirect syscall on mips o32.
368 * Implemented decoding of IPPROTO_IP control messages.
369 * Implemented decoding of setsockopt syscall multicast arguments.
370 * Enhanced decoding of struct sigevent.
371 * Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
372 and v4l2 ioctl syscall arguments.
373 * Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
374 getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
375 sendfile, setsockopt, and shmctl syscalls.
376 * Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
377 lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
378 open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
379 * Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
380 IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
381 PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
383 * Added Nios II architecture support.
384 * Added new syscall entries to match Linux 4.4.
387 * Fixed potential short read of strings from tracee's memory.
388 * Fixed -qq option in conjunction with -o option.
389 * Fixed filtering of <unavailable> syscalls.
390 * Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
391 with 64-bit aligned structures.
392 * Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
393 syscall flags arguments.
394 * Fixed decoding of 4th argument of clock_nanosleep syscall.
395 * Fixed decoding of getpagesize syscall on m68k.
396 * Fixed decoding of getrandom and seccomp syscalls on aarch64.
397 * Fixed decoding of timezone argument of gettimeofday and settimeofday
399 * Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
401 * Fixed decoding of pipe syscall on alpha and mips.
402 * Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
403 * Fixed decoding of signal mask argument of pselect6 syscall on x32.
404 * Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
406 * Fixed decoding of 4th argument of semctl indirect syscall.
407 * Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
408 * Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
409 * Fixed decoding of struct dirent on x32.
410 * Fixed decoding of times syscall return value on mips n32 and x32.
411 * Fixed decoding of path argument of umount2 syscall
412 (addresses Debian bug #785050).
413 * Worked around a kernel bug in tracing privileged executables.
414 * Fixed various errors in mapping between syscall numbers and associated
415 information like the number of syscall arguments, the name of syscall,
418 Noteworthy changes in release 4.10 (2015-03-06)
419 ===============================================
422 * Added -yy option to print protocol and address information associated with
424 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
425 recvmsg, sendmmsg, and recvmmsg syscalls.
426 * Implemented full 32-bit decoding of ioctl commands
427 (addresses Debian bug #692913 and Fedora bug #902788).
428 * Implemented PTRACE_GETREGS API support on ia64.
429 * Implemented PTRACE_GETREGS API support on mips.
430 * Implemented PTRACE_GETREGSET API support on s390/s390x.
431 * Implemented decoding of getrandom and seccomp syscalls.
432 * Implemented full decoding of 64-bit capability sets.
433 * Implemented decoding of all prctl commands.
434 * Implemented decoding of parametrized ioctl commands.
435 * Implemented decoding of evdev ioctl commands.
436 * Implemented decoding of v4l ioctl commands.
437 * Implemented decoding of SG_IO v4 ioctl commands.
438 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
439 * Implemented decoding of FALLOC_FL_* fallocate flags.
440 * Implemented decoding of rt_sigreturn signal mask on aarch64,
442 * Enhanced socket decoder to support bluetooth sockets.
443 * Enhanced decoding of unlisted ioctl commands.
444 * Enhanced decoding of getsockopt and setsockopt syscall.
445 * Enhanced decoding of sysinfo syscall.
446 * Enhanced decoding of struct cmsghdr.
447 * Enhanced decoding of wait status.
448 * Enhanced aio support on non-x86 architectures by using external libaio.h.
449 * Added O_TMPFILE to the list of recognized open mode flags.
450 * Updated the list of filesystem type constants that is used in decoding
451 statfs family syscalls.
452 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
454 * Updated lists of signal constants from Linux 3.19.
455 * Updated lists of errno constants from Linux 3.19.
456 * Updated lists of ioctl commands from Linux 3.9.
457 * Added new syscall entries to match Linux 3.19.
460 * Fixed various errors in mapping between syscall numbers and associated
461 information like the number of syscall arguments, the name of syscall,
463 * Fixed quoting issues in printing descriptors, filenames, network interface
464 names, struct utsname members, device/volume names of BLK* ioctl commands.
465 * Fixed uid_t/git_t decoding.
466 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
467 * Fixed potential open flags truncation on some architectures.
468 * Fixed decoding of struct ifreq.ifr_name.
469 * Fixed decoding of SIOCSIFNAME ioctl command.
470 * Fixed decoding of RENAME_* renameat2 flags.
471 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
472 * Fixed decoding of indirect ipc subcalls on some architectures.
473 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
474 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
475 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
476 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
477 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
478 sparc, sparc64, mips, and s390.
479 * Fixed instruction pointer output (-i option) on architectures that support
480 several personalities.
481 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
483 * Fixed build on systems where struct sigaction has no sa_restorer member.
484 * Fixed build with uclibc and musl libc.
487 * Linux kernel >= 2.5.46 is required.
488 Older versions without a decent PTRACE_SETOPTIONS support will not work.
489 * On mips, linux kernel >= 2.6.15 is required.
490 Older versions without a decent PTRACE_GETREGS support will not work.
491 * On s390 and s390x, linux kernel >= 2.6.27 is required.
492 Older versions without a decent PTRACE_GETREGSET support will not work.
494 Noteworthy changes in release 4.9 (2014-08-15)
495 ==============================================
497 * Changes in behavior
498 * Disabled OABI support on ARM EABI systems by default,
499 added --enable-arm-oabi option to enable it at configure time.
502 * Added experimental -k option to print stack trace after each traced syscall.
503 * Added -w option to produce stats on syscall latency.
504 (addresses Debian bug #457497).
505 * Added ARC architecture support.
506 * Added PTRACE_GETREGS API support on PowerPC.
507 * Enhanced Bionic libc and musl libc support.
508 * Enhanced tracing of x86 personality processes on x86_64 and x32.
509 * Enhanced tracing of ARM personality processes on AArch64.
510 * Enhanced 32/64bit personality detection on PowerPC.
511 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
512 renameat2, and request_key syscalls.
513 * Robustified decoding of select, pselect, and io_submit syscalls.
514 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
515 setdomainname, sethostname, setns, and sync_file_range syscalls.
516 * Enhanced decoding of signal bitmasks.
517 * Enhanced decoding of file descriptors.
518 * Enhanced siginfo_t decoding.
519 * Enhanced PF_NETLINK decoding.
520 * Updated CLOCK_* constants
521 (addresses Fedora bug #1088455).
522 * Added new syscall entries to match Linux 3.16.
525 * Added shmat and shmdt to the set of memory mapping related syscalls.
526 * Fixed detaching from stopped processes.
527 * Fixed fanotify_mark decoding on 32bit architectures.
528 * Fixed offset decoding in preadv and pwritev syscalls.
529 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
530 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
531 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
532 (addresses Fedora bug #993384).
533 * Miscellaneous corrections in the manual page.
534 (Addresses Debian bug #725987).
536 Noteworthy changes in release 4.8 (2013-06-03)
537 ==============================================
539 * Changes in behavior
540 * In case of normal strace termination, when the trace output is
541 redirected to a pipe, strace now closes it and waits for the pipe
542 process termination before exit.
545 * Implemented tracing using PTRACE_SEIZE API (when available).
546 * Implemented more reliable PTRACE_GETREGSET-based process personality
547 detection on x86-64 and x32 (when available).
548 * Added -e trace=memory option for tracing memory mapping related syscalls.
549 * Documented -b option.
550 * Allowed exit status messages to be suppressed by giving -q option twice.
551 * Added AArch64 architecture support
552 (addresses Debian bug #693074 and Fedora bug #969858).
553 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
554 * Added tilegx personality support for Tile.
555 * Enhanced support of NOMMU architectures.
556 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
558 * Added new syscall entries to match Linux 3.9.
559 * Regenerated the list of common ioctl names from Linux 3.9.
560 * Updated the list of errno constants.
561 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
562 PTRACE_O_*, and TCP_* constants.
563 * Implemented decoding of UBI ioctls.
564 * Removed redundant "*32" ioctl names.
567 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
568 (addresses Fedora bug #659382).
569 * Fixed kernel release string parsing
570 (addresses Debian bug #702309).
571 * Fixed decoding of *xattr syscalls
572 (addresses Fedora bug #885233).
573 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
574 (addresses Fedora bug #912790).
575 * Fixed tracing forks on SPARC.
576 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
577 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
578 and truncate64 syscalls.
579 * Fixed categories of multiple syscalls on most of supported architectures.
580 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
581 * Fixed decoding of multiple 32-bit personality syscalls on x32.
582 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
583 S390x, and Tile architectures.
584 * Fixed semtimedop decoding on S390x.
585 * Fixed sram_alloc decoding on Blackfin.
586 * Fixed build when process_vm_readv is a stab.
587 * Fixed build with older versions of libaio.h.
589 Noteworthy changes in release 4.7 (2012-05-02)
590 ==============================================
592 * Changes in behavior
593 * strace no longer suspends waitpid until there is a child
594 for waitpid'ing process to collect status from.
595 * strace no longer detaches from a tracee which is supposed
597 * strace now issues a new message: "+++ exited with EXITCODE +++"
598 which shows exact moment strace got exit notification,
599 analogous to existing "+++ killed by SIG +++" message.
602 * Added x32 personality support (x86_64 architecture).
603 * Added -y and -P options to print file descriptor paths and
604 filter by those paths.
605 * Added -I option to control strace interactivity.
606 * Allowed -p option to take comma or whitespace-separated list of PIDs.
607 * Added strace_log_merge script helper to merge timestamped "strace -ff"
609 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
610 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
611 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
612 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
613 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
614 listxattr, setrlimit and swapon syscalls.
615 * Implemented decoding of loop and mtd ioctls.
616 * Added syscall entries for new linux syscalls.
617 * Added syscall entries for direct socket system calls on powerpc.
618 * Updated the list of errno constants.
619 * Updated lists of MSG_*, STA_*, and TCP_* constants.
620 * Regenerated the list of ioctl names from Linux 3.3.
621 * Enhanced switching between processes with different personalities.
622 * Enhanced signals reporting by using short signal names.
623 * Made ERESTART* messages more descriptive.
624 * Made parsing of numbers from strings more robust.
625 * Added support for compat_statfs64 and statfs64.f_flags.
626 * Changed read of data blocks to use single process_vm_readv syscall
627 (when available) instead of several PTRACE_PEEKDATA operations.
628 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
629 operation instead of several PTRACE_PEEKUSER operations.
630 * Applied various optimizations to make strace work faster.
633 * Implemented proper handling of real SIGTRAPs on kernels supporting
634 PTRACE_O_TRACESYSGOOD.
635 (Addresses Fedora bug #162774).
636 * Fixed sockaddr_un.sun_path name in decoded output.
637 (Addresses Debian bug #554946).
638 * Fixed to avoid potential core file clobbering on exit.
639 (Addresses Debian bug #656398).
640 * Fixed a typo in documentation.
641 (Addresses Debian bug #653309).
642 * Fixed decoding of timer id returned by timer_create.
643 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
644 * Fixed *at syscalls flags decoding.
645 * Fixed ARM EABI 64-bit syscall's arguments decoding.
646 * Fixed semtimedop decoding on s390.
647 * Fixed osf_sigprocmask decoding on alpha.
648 * Fixed ipc and socket subcall decoding on several architectures.
649 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
650 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
651 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
652 * Corrected io_* syscall entries on ARM.
653 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
654 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
655 * Fixed build when libaio-devel is not available.
656 * Fixed configure checks for PTRACE_* constants.
657 * Fixed compilation warnings remained on several architectures.
660 * Removed all non-Linux code. After years of neglect, that dead code
661 just hampered further strace development.
662 * Linux kernel >= 2.6.18 is recommended. Older versions might still
663 work but they haven't been thoroughly tested with this release.
665 Noteworthy changes in release 4.6 (2011-03-15)
666 ==============================================
668 * Changes in behavior
669 * Print diagnostic information about changes in personality mode to
670 standard error instead of standard output.
673 * Implemented a new method of following clone, fork, and vfork
674 syscalls using the Linux kernel's explicit facilities for tracing
675 creation of threads and child processes.
676 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
677 * Implemented decoding of TLS syscalls on m68k.
678 * Implemented biarch support on powerpc64.
679 * Implemented biarch support for getrlimit() and setrlimit().
680 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
681 * Implemented SOL_SCTP socket options decoding.
682 * Added HDIO_* ioctl names.
683 (Addresses Debian bug #450953).
684 * Added LOOP_* ioctl names.
685 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
686 to match Linux 2.6.37.
687 * Updated the list of IPPROTO_* constants to match netinet/in.h.
688 * Implemented decoding of HDIO_* and BLK* ioctls.
689 * Added MicroBlaze architecture support.
690 * Added new syscall entries to match Linux 2.6.37.
691 * Regenerated list of ioctl names from Linux 2.6.37.
692 * Enhanced signal notification decoding.
693 * Documented -C and -D options.
696 * Fixed fetching syscall arguments on m68k.
697 * Fixed an error when judging whether a process has children.
698 * Fixed get/set_robust_list syscall numbers for powerpc.
699 * Fixed a corner case in printing clone flags.
700 * Fixed cross-compiling issues.
701 * Fixed build issues on powerpc64, SH and SPARC.
702 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
703 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
704 fanotify_init, and fanotify_mark syscalls.
705 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
706 * Fixed biarch support in IO dumping.
707 * Fixed raw exit_group decoding.
708 * Fixed decoding of file descriptors on 64-bit architectures.
709 * Fixed a corner case in waitpid handling.
710 (Addresses Red Hat bug #663547).
711 * Fixed stat64 decoding on mips
712 (Addresses Debian bug #599028).
713 * Fixed misleading italics in the manual page.
714 (Addresses Debian bug #589323).
716 Noteworthy changes in release 4.5.20 (2010-04-13)
717 =================================================
720 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
721 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
722 rt_tgsigqueueinfo, perf_event_open.
723 * Enhanced decoding of recently added syscalls on non-x86 architectures
724 by replacing a bare decoder with elaborate parsers enabled earlier
726 * Implemented -C option to combine regular and -c output.
727 (Addresses Debian bug #466196)
728 * Enhanced decoding of mbind and mremap syscalls.
729 * Enhanced SOL_PACKET socket options decoding.
730 * Regenerated list of ioctl names from linux 2.6.33.
731 * Added TILE architecture support.
734 * Fixed build with Linux kernel headers 2.6.32-rc5+.
735 (Addresses Debian bug #560516 and Fedora bug #539044)
736 * Fixed build on mips.
737 * Fixed handling of Linux systems without struct statfs64.
738 * Fixed reporting signal mask by sigreturn on powerpc.
739 * Fixed potential stack buffer overflow in select decoder.
740 (Addresses Fedora bug #556678)
741 * Corrected msgsnd indirect ipccall decoding.
742 * Corrected decoding of 64bit syscalls.
743 (Addresses Debian bug #570603)
744 * Corrected getsockopt decoding on architectures where
745 sizeof(long) > sizeof(int).
746 (Addresses Debian bug #494844)
747 * Corrected decoding of epoll_pwait.
748 (Addresses Debian bug #513014)
749 * Corrected handling of killed threads.
751 Noteworthy changes in release 4.5.19 (2009-10-21)
752 =================================================
754 * Changes in behavior
755 * When command exits, strace now exits with the same exit status.
756 If command is terminated by a signal, strace terminates itself
757 with the same signal, so that strace can be used as a wrapper
758 process transparent to the invoking parent process.
759 When using -p option, the exit status of strace is zero unless
760 there was an unexpected error in doing the tracing.
761 (Addresses Fedora bug #105371 and Debian bug #37665)
764 * Implemented decoding of new Linux syscalls: accept4, dup3,
765 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
766 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
767 * Implemented decoding of accept4 socketcall.
768 * Enhanced prctl decoding.
769 * Enhanced nanosleep decoding.
770 * Enhanced ptrace decoding.
771 * Enhanced futex decoding.
772 * Enhanced CAP_* decoding.
773 * Enhanced SIOCS* ioctls decoding.
774 * Enhanced fcntl F_* flags decoding.
775 * Enhanced semop/semtimedop decoding.
776 * Updated ARM architecture support.
777 * Added Blackfin architecture support.
778 * Added AVR32 architecture support.
779 * Added CRIS architecture support.
780 * Made strace detect when traced process suddenly disappeared.
783 * Fixed syscall numbers for tee and sync_file_range.
784 (Addresses Debian bug #503124)
785 * Fixed several bugs in strings decoder, including potential heap
787 (Addresses Fedora bugs #470529, #478324 and #511035)
788 * Marked sendfile(2) as a network syscall.
789 (Addresses Debian bug #509499)
790 * Fixed accept(2) decoding.
791 (Addresses Debian bug #507573)
792 * Fixed sigtimedwait(2) decoding.
793 * Fixed build on ARM EABI.
794 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
795 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
796 (Addresses Red Hat bug #471169)
797 * Fixed display of 32-bit argv array on 64-bit architectures.
798 (Addresses Fedora bug #519480)
799 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
800 * Fixed HPPA architecture support.
801 (Addresses Debian bugs #437928 and #546619)
806 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
807 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
812 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
813 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
814 * Improved output for prctl system call on Linux.
815 * Improved support for Linux/ARM.
816 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
821 * Improved output for delete_module, futex, and mbind system calls on Linux.
822 * Improved output for SG_IO ioctls on Linux.
823 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
824 eventfd, getcpu, epoll_pwait.
829 * Several biarch improvements.
830 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
831 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
836 * Accept numeric system calls in -e.
841 * Introduce "-e trace=desc".
846 * Better x86-64 support for IA32 processes.
847 * Update PowerPC system calls.
848 * Better printing for Linux aio system calls.
852 * Quick fix release for build issues.
853 * One fix for Linux/ARM system call table.
858 * Print fault address for SIGSEGV/SIGBUS signals when available.
863 * Improve socket ioctl printing.
864 * Update Linux/IA64 syscall list.
865 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
866 * Improve mount flags printing.
867 * Support symbolic printing of x86_64 arch_prctl parameters.
872 * Update syscall tables for Alpha, ARM, HPPA.
873 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
874 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
875 * Improve ioctl command name matching.
876 * Print RTC_* ioctl structure contents.
877 * Support newer RLIMIT_* values.
878 * Print struct cmsghdr details in sendmsg.
883 * Print attribute values in *xattr system calls on Linux.
884 * Include pread and pwrite calls in -e read and -e write tracing.
885 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
886 * Print clock_t values symbolically in Linux clock_* system calls.
890 * Bug fixes, Linux ioctl updates.
891 * David Miller contributed support for Linux/SPARC64.
899 * Update Linux ioctl lists.
900 * Update PF_* and AF_* value lists.
901 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
906 * On Linux using NPTL threads, -p will now attach to all threads in a process.
907 * Handle new mq_* system calls in Linux 2.6.6 and later.
912 * Report some new VM_* bit values on Linux.
913 * Better output for Linux sched_* system calls.
918 * Display multiple ioctl name matches on Linux.
922 * New port to AMD's x86-64 architecture. One strace binary can
923 handle both new x86-64 and old i386 processes.
924 * Fixed support for LFS64 calls.
925 * New switch -E to add/remove environment variables for the command.
926 * Merged s390/s390x port.
927 * Trace an unbounded number of processes.
928 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
929 * Fixed bugs with attach/detach leaving things stopped.
930 * Fixed traced process seeing ECHILD despite live, traced children
931 in waitpid calls with WNOHANG.
932 * Stuart Menefy contributed a port to Linux/SH.
933 * Stephen Thomas contributed a port to Linux/SH64.
934 * Many other bug fixes.
938 * Fix Linux/ia64 support, looks like someone renamed a few things on us
939 * Fix the ioctl setup for Linux, turned out it did not really work.
940 Improve the ioctl extractor as well so we decode some more ones.
944 * compile fixes for Linux/mips
948 * Linux ia64 and hppa ports added
949 * The usual Linux syscall updates (includes 32bit uid/gid support),
950 * Linux ioctl list updated
951 * Support IPv6 scope ids
952 * FreeBSD/i386 port added
953 * UnixWare and Solaris updates
954 * Better support for tracing multithreaded processes in Linux
958 * Compiles on glibc2.0 systems again
959 * Linux/S390 port added
960 * The usual Linux syscall updates
961 * we can follow fork on arm now
965 * Linux/MIPS port added
966 * Lots of Linux updates again
967 * Improved IPv6 support
973 * Compiles on glibc2.0 systems again
977 * Get stat structure properly on Linux 64bit archs
978 * Personalities work again
979 * Compile correctly on SunOS again
985 * Linux (ultra)sparc fixes
992 * add support for more Linux architectures (powerpc, sparc, arm)
993 * support lots more Linux syscalls
994 * fix signal handling
995 * add IPX and IPIP support
996 * check stray syscall after execv
997 * fix hanging children
999 Changes in version 3.1
1000 ======================
1002 * Irix5 is supported
1003 * Linux 68k is supported
1004 * Linux alpha is supported
1005 * configure is upgraded to autoconf 2.x
1006 * using -f in combination with -e now works correctly
1007 * output can be piped to a program
1008 * tracing setuid programs works better
1009 * it is now reasonable to install strace setuid to root in some circumstances
1010 * new useful tracing names like file and process to trace whole
1011 classes of system calls, e.g. -efile traces all system calls that
1012 take a file name as an argument
1013 * IPC calls on SunOS 4.1.x are decoded
1014 * Linux program memory is reliably dereferenced
1015 * Linux decodes at least the name of all syscalls as of pre2.0.4
1016 * various cosmetic changes and bug fixes
1018 Changes from versions 2.x to version 3.0
1019 ========================================
1021 * filename arguments are neither abbreviated nor stringified
1022 * string arguments are now true C strings using octal instead of hex by default
1023 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
1024 * by default the output for multiple processes now goes into one file
1025 * all structures, vectors, bitsets, etc. use consistent output formats
1026 * the -c option now means count calls, -i does what the old -c used to do
1028 New Features in version 3.0
1029 ===========================
1031 * non-ascii strings can be optionally printed entirely in hex
1032 * the output format is readable when multiple processes are generating output
1033 * exit values are printed in an alignment column
1034 * is is possible to suppress messages about attaching and detaching
1035 * various tracing features can be enabled on a per syscall/signal/desc basis
1036 * selective tracing of syscalls
1037 * selective printing of syscall structures
1038 * selective abbreviation of long structures on a per syscall basis
1039 * selective printing of raw syscall arguments and results
1040 * selective tracing of signals
1041 * selective dumping of all I/O read from file descriptors
1042 * selective dumping of all I/O written to file descriptors
1043 * optional counting of time, calls, and errors for each syscall