Reduce false positives by wrapping network-related operations into a loop.
* ci/install-dependencies.sh (retry_if_failed): New function.
Use it to invoke apt-get update, apt-get install, git clone,
add-apt-repository, and pip install.
Dmitry V. Levin [Mon, 18 Jun 2018 22:59:38 +0000 (22:59 +0000)]
Fix build on systems where libc relies on <linux/signal.h>
Commit v4.23~10 has broken the build with Android's libc because it
relies on the UAPI headers (such as <linux/signal.h>) to define various
types, rather than copying them into the libc headers (such as <signal.h>)
like most other Linux C libraries.
* linux/linux/signal.h: Rename to linux/signal.h.in.
* Makefile.am (strace_SOURCES): Remove linux/linux/signal.h.
(EXTRA_DIST): Add linux/signal.h.in.
(DISTCLEANFILES): Add linux/linux/signal.h.
* configure.ac (AC_CACHE_CHECK): Check whether <linux/signal.h>
can be used along with <signal.h>, install linux/linux/signal.h
workaround if they cannot be used together.
* xlat/aio_cmds.in: New file.
* aio.c (tprint_lio_opcode): Change array of structs "cmds" to array of
enums "subs", use printxval_indexn_ex for printing cmd, return sub type
using subs array.
* xlat/sock_tcp_options.in (TCP_ZEROCOPY_RECEIVE): New constant,
introduced by Linux commit v4.18-rc1~114^2~351^2~1.
(TCP_INQ): New constant, introduced by Linux commit v4.18-rc1~114^2~330.
* print_aio_sigset.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* aio.c (print_io_getevents): Rename from SYS_FUNC(io_getevents), add
has_usig flag, print user sigset on exiting if has_usig is set to true.
(SYS_FUNC(io_getevents), SYS_FUNC(io_pgetevents)): New functions,
wrappers for print_io_getevents.
* linux/32/syscallent.h ([292]): Wire up io_pgetevents.
* linux/64/syscallent.h ([292]): Likewise.
* linux/i386/syscallent.h ([385]): Likewise.
* linux/x32/syscallent.h ([333]): Likewise.
* linux/x86_64/syscallent.h ([333]): Likewise.
* NEWS: Mention this improvement.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
Dmitry V. Levin [Tue, 12 Jun 2018 12:27:22 +0000 (12:27 +0000)]
travis: re-enable testing with the latest mainline kernel headers
As <linux/signal.h> is out of the game now, the Linux commit v4.17-rc3-7-g7a074e9 should not cause harm anymore, so let's enable
testing with the latest mainline kernel headers again.
* .travis.yml (matrix): Do not specify KBRANCH for KHEADERS=torvalds/linux.
Add support for personality designation in regex qualifications
* basic_filters.c (qualify_syscall_regex): Copy syscall name
to a temporary buffer, append the personality designation to it,
and check it against regular expression if the syscall name
hasn't been matched already.
Add support for personality designation in syscall qualifications
* syscall.c (personality_designators): New array.
* defs.h (personality_designators): New declaration.
* basic_filters.c (qualify_syscall_separate_personality,
qualify_syscall_number_personality): New functions.
(qualify_syscall_number): Use qualify_syscall_separate_personality for
checking for a personality specification, call
qualify_syscall_number_personality for setting number set for specific
personality.
(qualify_syscall_name_personality): New function.
(qualify_syscall_name): Use qualify_syscall_separate_personality for
checking for a personality specification, call
qualify_syscall_name_personality for setting number set for specific
personality.
* strace.1.in (.SS Filtering): Document it.
* NEWS: Mention it.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org> Closes: https://github.com/strace/strace/issues/35
Implement injection of syscalls with no side effects as an alternative to -1
* defs.h (INJECT_F_SYSCALL, INJECT_ACTION_FLAGS, TCB_TAMPERED_NO_FAIL,
syscall_tampered_nofail): New macros.
(inject_data): Add scno field.
* filter_qualify.c (struct inject_personality_data): New type.
(parse_inject_token): Add "pdata" argument, parse "syscall=" option.
(parse_inject_expression): Add "pdata" argument, forward it to
parse_inject_token.
(qualify_inject_common) <pdata>: New variable array, pass it to
parse_inject_expression, copy it into inject_vec.
* syscall.c (tamper_with_syscall_entering): Inject the specified syscall
if INJECT_F_SYSCALL is set.
(tamper_with_syscall_exiting): Update the check for a failed syscall
injection.
(get_syscall_result): Update get_error invocation.
* strace.1.in: Document new syscall injection expression.
* NEWS: Mention it.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org> Closes: https://github.com/strace/strace/issues/26
linux: set error flags in arch_set_error on POWER and Alpha
* alpha/set_error.c (arch_set_error): Set alpha_r3 to 1, update tracee's
REG_A3.
* powerpc/set_error.c (arch_set_error): Set bit 28 in CCR register,
update tracee's PT_CCR.
Fixes: v4.15~126 "Implement arch specific methods of changing syscall number and error code"
tests: add fallback_func argument to TEST_NESTED_NLATTR_OBJECT_EX_
* tests/test_nlattr.h (TEST_NESTED_NLATTR_OBJECT_EX_): Add fallback_func
argument, call it instead of print_quoted_hex.
(TEST_NESTED_NLATTR_OBJECT_EX, TEST_NESTED_NLATTR_OBJECT): Specify
print_quoted_hex as a fallback_func.
* tests/nlattr_ifla_af_spec.c: Specify print_quoted_hex as
a fallback_func in TEST_NESTED_NLATTR_OBJECT_EX_ calls.
tests/test_nlattr.h: add ability to provide additional nlattr payload
* tests/test_nlattr.h (print_nlattr): Add add_data argument, print
opening square bracket if add_data is set to true.
(TEST_NLATTR_EX_): Rename from TEST_NLATTR_, add nla_total_len_
argument, use it for msg_len calculation, print square brackets
if nla_total_len_ is greater than nla_data_len_.
(TEST_NLATTR_): New macro, a wrapper for TEST_NLATTR_EX_.
* rtnl_link.c (decode_ifla_bridge_id): Provide struct definition for
the id variable.
[!HAVE_STRUCT_IFLA_BRIDGE_ID] (decode_ifla_bridge_id): Decode struct
ifla_bridge_id.
rtnl_link: fix incorrect variable names in ARRAY_SIZE arguments
* rtnl_link.c (decode_nla_linkinfo_data_bridge): Change
rtnl_ifla_info_data_bridge_attrs to ifla_info_data_bridge_nla_decoders
in ARRAY_SIZE call.
(decode_nla_linkinfo_data_tun): Change rtnl_ifla_info_data_tun_attrs
to ifla_info_data_tun_nla_decoders in ARRAY_SIZE call.
Fixes: v4.22-328-g1e6d5a8 "rtnl_link: implement IFLA_INFO_DATA for bridges" Fixes: v4.22-329-g4eab3a4 "rtnl_link: implement IFLA_INFO_DATA for tun devices"
Dmitry V. Levin [Thu, 7 Jun 2018 14:01:24 +0000 (14:01 +0000)]
configure.ac: fix the check for struct tc_sizespec on old kernel headers
* configure.ac (AC_CHECK_TYPES): Include <linux/types.h> before
<linux/pkt_sched.h> to check for struct tc_sizespec on linux kernel
headers without v2.6.29-rc4~77^2~26 fix.
tests: add TEST_NESTED_NLATTR_ARRAY_EX to test_nlattr.h
An ability to specify custom depth is going to be needed later to check
IFLA_AF_SPEC decoding.
* configure.ac (AC_CHECK_DECLS): Check for TCA_STAB_DATA in
<linux/pkt_sched.h>.
* tests/test_nlattr.h (TEST_NESTED_NLATTR_ARRAY_EX): Rename from
TEST_NESTED_NLATTR_ARRAY, add depth_ argument, perform padding and
output accordingly.
(TEST_NESTED_NLATTR_ARRAY): New macro, a thin wrapper around
TEST_NESTED_NLATTR_ARRAY_EX.
* tests/nlattr_tca_stab.c [!HAVE_DECL_TCA_STAB_DATA] (TCA_STAB_DATA):
New enumeration declaration.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
tests: pass index to print_elem_ callback in TEST_NLATTR_NESTED_ARRAY
* tests/test_nlattr.h (TEST_NLATTR_NESTED_ARRAY): Pass array index
to the print_elem_ callback.
* tests/nlattr_tca_stab.c (print_uint16): Add index argument.
tests: move common ifinfomsg boilerplate into a separate header
* configure.ac (AC_CHECK_DECLS): Check for IFLA_PORT_SELF, IFLA_PROTINFO, and
IFLA_XDP in <linux/rtnetlink.h>.
* tests/nlattr_ifla.h: New file.
* tests/Makefile.am (EXTRA_DIST): Add it.
* tests/nlattr_ifla_brport.c [!HAVE_DECL_IFLA_PROTINFO] (IFLA_PROTINFO):
New declaration.
(hdrlen, init_ifinfomsg, print_ifinfomsg): Remove.
(IFLA_ATTR): Define to IFLA_PROTINFO.
Include nlattr_ifla.h.
* tests/nlattr_ifla_port.c [!HAVE_DECL_IFLA_PORT_SELF] (IFLA_PORT_SELF):
New declaration.
(hdrlen, init_ifinfomsg, print_ifinfomsg): Remove.
(IFLA_ATTR): Define to IFLA_PORT_SELF.
Include nlattr_ifla.h.
* tests/nlattr_ifla_xdp.c
* tests/nlattr_ifla_xdp.c [!HAVE_DECL_IFLA_XDP] (IFLA_XDP): New
declaration.
(hdrlen, init_ifinfomsg, print_ifinfomsg): Remove.
(IFLA_ATTR): Define to IFLA_XDP.
Include nlattr_ifla.h.
rtnl_link: implement IFLA_INFO_DATA for tun devices
* xlat/rtnl_ifla_info_data_tun_attrs.in: New file.
* xlat/tun_device_types.in: Likewise.
* rtnl_link.c: Include xlat/rtnl_ifla_info_data_tun_attrs.h and
xlat/tun_device_types.h.
(decode_nla_tun_type, decode_nla_linkinfo_data_tun): New functions.
(ifla_info_data_tun_nla_decoders): New decoder dispatcher table.
(decode_nla_linkinfo_data): Use decode_nla_linkinfo_data_tun if kind
is
"tun".
* xlat/rtnl_ifla_info_data_bridge_attrs.in: New file.
* rtnl_link.c: Include xlat/rtnl_ifla_info_data_bridge_attrs.h.
(ifla_info_data_bridge_nla_decoders): New decoder dispatcher table.
(decode_nla_linkinfo_data_bridge, decode_nla_linkinfo_data): New
functions.
(ifla_linkinfo_nla_decoders) <IFLA_INFO_DATA>: Use
decode_nla_linkinfo_data as a decoder.
* rtnl_link.c (decode_nla_linkinfo_xstats_can,
decode_nla_linkinfo_xstats): New function.
(ifla_linkinfo_nla_decoders) <IFLA_INFO_XSTATS>: Use
decode_nla_linkinfo_xstats as a decoder.
Dispatch for IFLA_INFO_* attributes should be performed based on the
string provided in a IFLA_INFO_KIND attribute.
* nlattr.h (struct ifla_linkinfo_ctx): New type definition.
* rtnl_link.c (decode_nla_linkinfo_kind): New function.
(ifla_linkinfo_nla_decoders) <IFLA_INFO_KIND>: Use
decode_nla_linkinfo_kind as decoder.
(decode_ifla_linkinfo): Add struct ifla_linkinfo_ctx context, pass it to
the decode_nlattr call as opaque data.
nlattr: add size check to decode_nla_xval and decode_nla_flags
If the field size is known, do not print as valid numbers those
attributes that are too short, and ignore extra data.
This change puts xval/flags printing in line with the reset of attribute
decoders.
* nlattr.h (struct decode_nla_xlat_opts): Add size field.
* nlattr.c (decode_nla_xval, decode_nla_flags): Check that len is at
least opts->size, limit len to opts->size.
(decode_nla_ip_proto): Specify size of 1.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
nlattr: add value processing support for xlat/flags nlattr decoders
Needed for upcoming decoder of ethernet proto which is stored in the
host order and has to be converted to the network order before printing
as an xval constant. This change also adds ability to provide
prefix/suffix in order to enclose the printed value in something that
describes the performed conversion.
nlattr: add ability to pass nla_type to decoder in decode_nlattr
As of now, it's impossible to introduce a dispatching nlattr decoder
that performs actions based on the type of the message, so let's use
a combination of zero decoder list size and non-zero decoder pointer
for this.
This is going to be used later in IFLA_AF_SPEC decoding.
* nlattr.c (decode_nlattr_with_data): Handle zero size and non-NULL
decoders in a special way.
(decode_nlattr): Add an error message about ignoring of opaque_data
argument when zero size and non-NULL decoders are provided.
* nlattr.h (decode_nlattr): Add a comment about the new special case.
xlat.c: handle NULL xlat in lookup routines as incremental search
This is going to be used later in IFLA_AF_SPEC decoding.
* xlat.c (xlookup): Add static variable pos, store xlat there when it is
non-NULL, use pos for lookup.
(xlat_search, xlat_idx): Add static variables pos and memb_left, store
xlat and nmemb there when xlat is non-NULL, use them for lookup.
(printxvals_ex): Store the last non-NULL xlat in static variable "last".
If the first xlat argument is NULL, use "last" instead.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
* rtnl_link.c (DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg)): Use
PRINT_FIELD_XVAL_SORTED_SIZED instead of PRINT_FIELD_XVAL for
arp_hardware_types.
* sock.c (print_ifreq): Likewise.
Dmitry V. Levin [Mon, 4 Jun 2018 01:11:05 +0000 (01:11 +0000)]
bpf: enhance BPF_OBJ_GET_INFO_BY_FD decoder further
* bpf.c (print_ebpf_prog): Remove "decode" argument, all users updated.
(print_bpf_prog_info): Use the minimum of xlated_prog_len values on
entering and exiting syscall as the size of xlated_prog_insns array
to be decoded. Likewise, use the minimum of nr_map_ids values on entering
and exiting syscall as the size of map_ids array to be decoded.
* bpf.c (print_bpf_map_info): Print only those fields that are
present in the structure, as it has been growing over time.
(print_bpf_prog_info): Likewise. Print map_ids field as an array
of uint32_t instead of uint64_t; print "name" field.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
bpf: move handling of the saved state to BPF_OBJ_GET_INFO_BY_FD decoder
As it is needed for proper info_len printing on exiting.
* bpf.c (print_bpf_obj_info_fn): Change return type to void, add "saved"
argument.
(struct obj_get_info_saved): New type definition.
(print_bpf_map_info, print_bpf_prog_info): Change return type to void,
add "saved" argument, do not handle private tcb data allocation and
obtainment.
(print_bpf_obj_info_addr): Change return type to void, add tcb argument,
print the address only on exiting.
(print_bpf_obj_info): Change return type to void, add "saved" argument.
(BEGIN_BPF_CMD_DECODER(BPF_OBJ_GET_INFO_BY_FD)): Handle private data
allocation/saving/restoring, use it for storing/printing info_len field.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
bpf: print xlated_prog_insns only when xlated_prog_len had not been 0
If xlated_prog_len is zero on entering syscall and non-zero on exiting,
the program itself is not written into xlated_prog_insns.
* bpf.c (print_ebpf_prog): Add decode argument, print the address only
if decode is false.
(BEGIN_BPF_CMD_DECODER(BPF_PROG_LOAD)): Specify decode == true argument
to print_ebpf_prog.
(print_bpf_prog_info): Specify saved xlated_prog_len as decode argument
to print_ebpf_prog.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
* bpf.c (print_ebpf_prog): Add static qualifier. Change the type
of "addr" argument from kernel_ulong_t to uint64_t, print it using
print_big_u64_addr.
(BEGIN_BPF_CMD_DECODER(BPF_PROG_LOAD), print_bpf_prog_info): Do not call
print_big_u64_addr before print_ebpf_prog.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
tests: cast printf arguments to short when %h format qualifier is used
Reported by clang.
* tests/mknod.c (main): Cast printf argument for %#03ho format to short.
* tests/mknodat.c (main): Likewise.
* tests/net-sockaddr.c (main): Cast printf argument for %hu format
to short.
* tests/semop.c (main): Likewise.
configure.ac: check for linux/rtnetlink.h instead of linux/if_link.h for declarations
Historically, type definitions and declarations related to netlink route
interface attributes were in linux/rtnetlink.h, later they were moved
elsewhere (first linux/if.h, then linux/if_link.h) with the inclusion
of the corresponding header file in linux/rtnetlink.h.
* configure.ac: Use <linux/rtnetlink.h> instead of <linux/if_link.h>
in checks for interface netlink attributes-related declarations
and definitions.
tests: check decoding of new FRA_* netlink attributes
* configure.ac (AC_CHECK_TYPES): Check for struct fib_rule_port_range
in <linux/fib_rules.h>.
* tests/nlattr_fib_rule_hdr.c: Include <linux/in.h>.
(FRA_PROTOCOL, FRA_IP_PROTO, FRA_SPORT_RANGE, FRA_DPORT_RANGE): New
macro constants.
[!HAVE_STRUCT_FIB_RULE_PORT_RANGE] (struct fib_rule_port_range): New
type.
(main): Check decoding of new FRA_* netlink attributes.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
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