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After commit v4.14-136-g151d1d1 that removed the last object common
for timespec and timeval parsers there is no need to keep them all
in a single file.
* print_timespec.c: New file.
* print_timeval.c: Likewise.
* Makefile.am (strace_SOURCES): Add them.
* print_time.c: Move all timespec related code to print_timespec.c.
Move all timeval related code to print_timeval.c.
Do not assume that some syscalls do not generate syscall-exit-stops.
When syscalls fail for any reason they may generate syscall-exit-stops.
The solution is to wait for an actual exit reported by PTRACE_EVENT_EXIT
and print the end of unfinished exiting syscall properly.
* exit.c: Remove.
* Makefile.am (strace_SOURCES): Remove exit.c.
* linux/dummy.h (sys_exit): Alias to printargs_d.
* strace.c (ptrace_setoptions): Add PTRACE_O_TRACEEXIT bit.
(print_event_exit): New function.
(trace): Use it in case of PTRACE_EVENT_EXIT.
* syscall.c (trace_syscall_entering): Remove special handling
of SEN_exit.
As printargs is invoked as a generic syscall decoder only and
it is not supposed to print anything on exiting, change printargs
to return RVAL_DECODED so it would not be called on exiting at all.
* util.c (printargs): Print args unconditionally, return RVAL_DECODED.
There is little use in injections of faults into syscalls made by strace.
* syscall.c (trace_syscall_entering): Clear QUAL_FAULT bit from
tcp->qual_flg when tcp->flags has TCB_HIDE_LOG bit set.
A simultaneous use of -p option and tracing of a command available
since commit v4.11-183-gfa8c286 introduces a race condition because
the flags whether the first exec has happened are global.
Fix the race by moving hide_log_until_execve and hide_log_until_execve
global variables to TCB_HIDE_LOG and TCB_SKIP_DETACH_ON_FIRST_EXEC bits
in struct tcb.flags, correspondingly.
* defs.h (TCB_HIDE_LOG, TCB_SKIP_DETACH_ON_FIRST_EXEC, hide_log):
New macros.
(hide_log_until_execve): Remove prototype.
* strace.c (skip_one_b_execve, hide_log_until_execve): Remove.
(startup_child): Set TCB_HIDE_LOG and TCB_SKIP_DETACH_ON_FIRST_EXEC bits
in the allocated tcb structure.
(init): Remove initialization of hide_log_until_execve and
skip_one_b_execve.
(print_stopped): Use hide_log() instead of hide_log_until_execve.
(trace): Check and clear TCB_SKIP_DETACH_ON_FIRST_EXEC flag instead
of skip_one_b_execve.
* syscall.c (trace_syscall_entering): Clear TCB_HIDE_LOG flag instead of
hide_log_until_execve.
(trace_syscall_entering, trace_syscall_exiting): Check hide_log()
instead of hide_log_until_execve.
Make expressions like fault=SYSCALL1,SYSCALL2:error=EPERM work
as documented, i.e. fail both SYSCALL1 and SYSCALL2 with EPERM.
* syscall.c (parse_fault_expression): Remove const qualifier from
"name" and "token: variables, as well as from the return value.
(qual_fault): Remove const qualifier from "name" variables.
Split "name" into comma delimited tokens and pass each token
to individual qual_syscall_ex call.
(qualify): For QUAL_FAULT options, pass the whole option value
to their qualify methods without prior splitting into comma
delimited tokens.
* tests/fault_injection.test: Check it.
* tests/fault_syntax.test: Check empty syscall sets.
* maint/ioctls_sym.sh: Skip asm/core_*.h. Filter out from
asm-generic/ioctls.h those macros that are defined using unavailable
struct termios2 on alpha and powerpc.
* maint/ioctls_sym.sh: Remove pre-include linux/kvm.h workarounds.
Skip linux/kvm.h on those architectures that have no asm/kvm.h file.
Introduce post-process workarounds, add post-process workarounds
for linux/kvm.h.
Kernel code does this when compares it with -1 (apart from comparing it with
PR_SET_PTRACER_ANY, which is also -1) in security/yama/yama_lsm.c.
* prctl.c (SYS_FUNC(prctl)) <PR_SET_PTRACER>: Cast arg2 to int before
comparing it with -1.
The prctl syscall does not use compat on x32/n32, so argument types
are in fact kernel_ulong_t.
* prctl.c (print_prctl_args): Use getarg_ull, print as "%#llx" instead
of "%#lx".
(SYS_FUNC(prctl)): Use getarg_ull to store call arguments in arg2, arg3,
arg4, arg5 variables of type unsigned long long. Use them in printing
routines.
(SYS_FUNC(arch_prctl)): Use getarg_ull to store call argument in addr
variable of type unsigned long long. Print it as "%#llx" instead of
"%#lx".
This is done in order to fix build error on old distributions where
struct blkpg_ioctl_arg declaration is broken:
In file included from block.c:35:
/usr/include/linux/blkpg.h:36: error: expected ':', ',', ';', '}' or '__attribute__' before '*' token
block.c: In function 'print_blkpg_req':
block.c:113: error: 'struct_blkpg_ioctl_arg' has no member named 'data'
(from SLE10)
* block.c: Include <linux/ioctl.h> instead of <linux/blkpg.h>.
(BLKPG, BLKPG_DEVNAMELTH, BLKPG_VOLNAMELTH): New macros.
(struct_blkpg_ioctl_arg, struct_blkpg_partition): New definitions,
copied from blkpg_ioctl_arg and blkpg_partition structures defined
in <linux/blkpg.h>.
Since UAPI header declares them under CONFIG_CHECKPOINT_RESTORE
and they would never be defined in user space.
* xlat/archvals.in: Add numeric values to ARCH_MAP_VDSO_* constants.
There are no users of prctl function in prctl.c, and all the rest
is provided by <linux/prctl.h> anyway.
* prctl.c: Include <linux/prctl.h> instead of <sys/prctl.h>.
* prctl.c (SYS_FUNC(prctl)): Use printstr_ex with QUOTE_0_TERMINATED
instead of printstr to print the argument of PR_SET_NAME and PR_GET_NAME
operations.
* util.c (printstr_ex): Simplify handling of size == 0 case.
Do not artificially decrement size when QUOTE_0_TERMINATED bit is set.
Ensure that str[size] byte is non-zero if it hasn't been fetched.
When user_style has QUOTE_0_TERMINATED bit set, printstr_ex prints
the fetched string as a NUL-terminated.
After this change, the string is being fetched as a NUL-terminated, too.
* util.c (printstr_ex): Use umovestr instead of umoven
if QUOTE_0_TERMINATED bit is set.
* xlat/v4l2_device_capabilities_flags.in: Add V4L2_CAP_TOUCH introduced
by linux kernel commit v4.9-rc4~7^2~422.
* xlat/v4l2_input_types.in: Add V4L2_CAP_TOUCH introduced
by linux kernel commit v4.9-rc4~7^2~422.
Fix the following build error on SLE 11 SP4:
btrfs.c: In function 'btrfs_test_dev_replace_ioctl':
btrfs.c:1570: error: unknown field 'start' specified in initializer
* tests/btrfs.c (btrfs_test_dev_replace_ioctl): Move initialization
of struct btrfs_ioctl_dev_replace_args.start.srcdevid out of the
designated initializer.
Do not assume that the string returned by signame starts with "SIG"
prefix, this is not always the case.
* syscall.c (qual_signal): Skip signame return value
when it does not have "SIG" prefix.
Change the way how subsequent -e fault= expressions are interpreted
to implement a cumulative behavior. For example,
-e fault=file:when=3+ -e fault=chdir
now specifies that all chdir syscalls and 3+ file related syscalls
except chdir are subject for fault injection.
* syscall.c (qualify): Do not reset qual_vec for QUAL_FAULT.
* tests/fault_injection.test: Check it.
Introduce new -e fault=EXPR syntax that can be used to specify a subset
of syscalls that are subject of syscall fault injection, an error code
that has to be injected, and a frequency of injection.
The expression specifying syscall fault injection has the following
format: SET[:error=ERRNO][:when=FIRST[+[STEP]]]
where only SET is a required part and all the rest is optional.
The method used to implement syscall fault injection is the following:
on entering syscall the syscall number is substituted by an invalid
syscall number -1, and on exiting syscall the error code returned by
the kernel is substituted with the error code specified in the fault
expression.
This implementaion is based on the prototype developed
by Nahim El Atmani as a part of his GSoC 2016 strace project.
* defs.h (struct fault_opts): New forward declaration.
(struct tcb): Add fault_vec field.
(TCB_FAULT_INJ, QUAL_FAULT): New macros.
* strace.1: Document -e fault expression syntax.
* strace.c (usage): Mention -e fault expression.
(droptcb): Deallocate fault_vec member.
* syscall.c (qual_fault, arch_set_scno, arch_set_error): New prototypes.
(qual_options): Add "fault" option.
(struct fault_opts): New structure.
(num_faults): New variable.
(fault_vec): New array.
(syscall_fault_injected, tcb_fault_opts, reallocate_fault,
find_errno_by_name, qual_syscall_ex, strip_prefix, parse_fault_token,
parse_fault_expression, qual_fault, inject_syscall_fault_entering,
update_syscall_fault_exiting): New functions.
(qual_syscall): Use qual_syscall_ex.
(qualify_one): Add argument: a pointer to struct fault_opts, all callers
changed. Copy struct fault_opts from the pointer to fault_vec.
Use reallocate_fault.
(qualify_scno, qualify_syscall_class, qualify_syscall_name): Add
argument: a pointer to struct fault_opts.
(qualify): Use reallocate_fault. Do not check "all" class for
QUAL_FAULT qualifier.
(lookup_class): Check for "all" class.
(trace_syscall_entering): Use inject_syscall_fault_entering.
(trace_syscall_exiting): Use update_syscall_fault_exiting. Clear
TCB_FAULT_INJ flag along with TCB_INSYSCALL. Print " (INJECTED)" suffix
when the syscall has been injected successfully.
[ARCH_REGS_FOR_GETREGSET && !HAVE_GETREGS_OLD]
(ptrace_setregset): New function.
(ptrace_setregset_or_setregs): Define to ptrace_setregset.
[ARCH_REGS_FOR_GETREGS && !HAVE_GETREGS_OLD]
(ptrace_setregs): New function.
(ptrace_setregset_or_setregs): Define to ptrace_setregs.
[ptrace_setregset_or_setregs] (set_regs): New function.
Include "set_scno.c" and "set_error.c"
* NEWS: Mention this enhancement.
