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This enables printing size-limited (expectedly) ASCIZ strings.
This is done by increasing umoven size limit for sized strings by one
byte above max_strlen (enabling copying possible NUL byte in case len is
greater than max_strlen) and decreasing size after copying by one byte
in case QUOTE_0_TERMINATED is set (due to user_style or usage of len of
-1). As a result, there is one excess byte for string_quote in case
QUOTE_0_TERMINATED is set so string_quote can check for NUL termination
of strings up to size bytes in size (which is len or max_strlen, whatever
is greater).
The catch here is that when string is not properly NUL-terminated and
QUOTE_0_TERMINATED is provided in user_style and len is less than
max_strlen then last non-NUL byte is not printed. But ellipsis is
printed instead, being indication that string is not terminated
properly. QUOTE_OMIT_TRAILING_0 should be used instead in case this
behaviour is not intended.
* util.c (printstr_ex): Copy one excess byte in case of non-negative len
provided and it is more than max_strlen; handle case of max_strlen of 0
in case QUOTE_0_TERMINATED is set separately; check for need of printing
ellipsis by checking resulting style against QUOTE_0_TERMINATED.
* linux/perf_event_struct.h: New file, definition of struct perf_event_attr
from Linux 4.8
* Makefile.am (strace_SOURCES): Add it.
* xlat/hw_breakpoint_len.in: New file.
* xlat/hw_breakpoint_type.in: Likewise.
* xlat/perf_attr_size.in: Likewise.
* xlat/perf_branch_sample_type.in: Likewise.
* xlat/perf_event_read_format.in: Likewise.
* xlat/perf_event_sample_format.in: Likewise.
* xlat/perf_hw_cache_id.in: Likewise.
* xlat/perf_hw_cache_op_id.in: Likewise.
* xlat/perf_hw_cache_op_result_id.in: Likewise.
* xlat/perf_hw_id.in: Likewise.
* xlat/perf_sw_ids.in: Likewise.
* xlat/perf_type_id.in: Likewise.
* perf.c [HAVE_LINUX_PERF_EVENT_H]: Remove inclusion of
<linux/perf_event.h>.
(PRINT_XLAT): New macro for simplifying printing values from
sorted xlat.
(printxlat_search): New function, wrapper for xlat_search with behaviour
similar to printval.
(print_perf_event_attr): New print_event_attr structure fetching and
printing function.
(SYS_FUNC(perf_event_open)): Use print_perf_event_attr for displaying
attr argument contents.
* tests/perf_event_open.c: Renamed to
tests/perf_event_open_nonverbose.c.
* tests/perf_event_open.test: add -e verbose=none in order to preserve
output format being checked (in case verbose output is enabled,
contents of attr arguments are shown now); rename to
tests/perf_event_open_nonverbose.test; add -e trace=perf_event_open.
* util.c (printxval_searchn): New function.
* defs.h (printxval_searchn): New prototype.
(printxval_search): New helper macro useful in conjunction with static
xlat arrays.
Also, use u_rval for determining message size.
* mq.c (SYS_FUNC(mq_timedreceive)): Check for syserror and non-negative
u_rval before calling printstr on msg_ptr argument, or use printaddr otherwise;
provide u_rval as string size.
mq_flags field of struct mq_attr can contain only O_NONBLOCK flag (other
flags are treated as invalid by mq_getsetattr). Moreover, this field is
ignored by mq_open at all (O_NONBLOCK is set via oflag, not via attr
attribute).
* xlat/mq_attr_flags.in: New file.
* print_mq_attr.c: Include xlat/mq_attr_flags.h.
(printmqattr): New parameter, bool decode_flags; cast members of struct
mq_attr to long long type; use mq_attr_flags xlat for printing mq_flags;
print mq_flags as flags only in case decode_flags parameter is set
to true.
* mq.c (SYS_FUNC(mq_open)): Specify value of false for decode_flags
parameter of printmqattr call.
(SYS_FUNC(mq_getsetattr)): Specify value of true for decode_flags
parameter of printmqattr call.
* tests/mq.expected: Update expected output.
* mq.c (SYS_FUNC(mq_timedsend)): Change conversion specifier from "%lu"
to "%llu", use getarg_ull for obtaining msg_len parameter.
(SYS_FUNC(mq_timedreceive)): Likewise.
It is defined as int in <linux/posix_types.h>.
* mq.c (SYS_FUNC(mq_timedsend)): Use "%d" conversion specifier instead
of "%ld" for printing mqdes (0th parameter), cast parameter value to
int.
(SYS_FUNC(mq_timedreceive)): Likewise.
(SYS_FUNC(mq_notify)): Likewise.
(SYS_FUNC(mq_getsetattr)): Likewise.
* tests/file_handle.c: replace fcntl.h include with asm/unistd.h.
[MAX_HANDLE_SZ]: change to defined __NR_name_to_handle_at
&& defined __NR_open_by_handle_at, add fcntl.h include
[!MAX_HANDLE_SZ]: Add definition of MAX_HANDLE_SZ and struct
file_handle.
(main): Change name_to_handle_at and open_by_handle_at calls to syscall.
Since the only two flags supported are AT_SYMLINK_FOLLOW and
AT_EMPTY_PATH.
* xlat/name_to_handle_at_flags.in: New file.
* file_handle.c (SYS_FUNC(name_to_handle_at)): Use name_to_handle_at_flags
for printing flags parameter.
Curiously, kexec_load uses compat on x32/n32, so its parameters should
be 4 bytes in size on these ABIs.
* kexec.c (SYS_FUNC(kexec_load)): Use widen_to_ulong for casting
parameters to proper size on x32/n32.
Kernel declares flags parameter as long and looks like x32 and n32
implement no compat for this call.
* clone.c (SYS_FUNC(unshare)): Use getarg_ull and printflags64 for
obtaining and parsing flags parameter.
Not all clone flags could be passed to unshare (see check_unshare_flags
function in kernel/fork.c).
* xlat/unshare_flags.in: New file.
* clone.c (SYS_FUNC(unshare)): Use unshare_flags for printing flags
parameter.
nstype is not flag set but specific type value against which it is
compared in kernel (see kernel/nsproxy.c, SYSCALL_DEFINE2(setns, ...)).
* xlat/setns_types.in: New file.
* clone.c: Use printxval and setns_types for nstype parameter.
As init_module has no compat wrapper, its first parameter is a pointer
and the second is length, they both have the same size as kernel_ulong_t
type.
* bjm.c (SYS_FUNC(init_module)): Obtain first two parameters using
getarg_ull, print address argument using printaddr_ull, print length
argument using "%llu" conversion specifier.
* defs.h (printaddr_ull): New prototype.
(printaddr): Change to a static inline wrapper around printaddr_ull.
* util.c (printaddr): Rename to printaddr_ull, change argument type
to unsigned long long, change print format to %#llx.
