- Linux-kselftest-mirror - lists.linaro.org

[PATCH v3 0/5] tracing: fprobe: list-style filters,

by Ryan Chung

This series aims to extend fprobe with list-style filters and a clear entry/exist qualifier. Users can now specify a comma-separated symbol list with ! exclusions, and use a spec-level suffix to select probe type: - funcA*, !funcAB, funcC -> entry probes - funcA*, !funcAB, funcC:entry -> explicit entry - funcA*, !funcAB, funcC:exit -> return/exit across the whole list For compatibility, %return remains supported for single, literal symbols. When a list or wildcard is used, an explicit [GROUP/EVENT is required and autogeneration is disabled. Autogen names are kept for single-symbol specs, with wildcard sanitization. For list/wildcard forms we set ctx->funcname = NULL so BTF lookups are not attempted. The series moves parsing to the parse path, documents the new syntax, and adds selftests that accept valid list cases and reject empty tokens, stray commas, and %return mixed with lists or wildcards. Selftests also verify enable/disable flow and that entry+exit on the same set do not double-count attached functions. Help wanted: This is my first time contributing ftrace selftests. I would appreciate comments and recommendations on test structure and coverage. Basic coverage is included, but this likely needs broader testing across architectures. Feedback and additional test ideas are welcome. Changes since v2: - Introduce spec-level: :entry/:exit; reject %return with lists/wildcards - Require explict [GROUP/]EVENT for list/wildcard; keep autogen only for single literal. - Sanitize autogen names for single-symbol wildcards - Set ctx->funcname = NULL for list/wildcard to bypass BTF - Move list parsing out of __register_trace_fprobe() and into the parse path - Update docs and tracefs README and add dynevent selftests for accept/reject and enable/disable flow Link: https://lore.kernel.org/lkml/20250904103219.f4937968362bfff1ecd3f004@kernel… Ryan Chung (5): docs: tracing: fprobe: document list filters and :entry/:exit tracing: fprobe: require explicit [GROUP/]EVENT for list/wildcard tracing: fprobe: support comma-separated symbols and :entry/:exit selftests/ftrace: dynevent: add reject cases for list/:entry/:exit selftests/ftrace: dynevent: add reject cases Documentation/trace/fprobetrace.rst | 27 +- kernel/trace/trace.c | 3 +- kernel/trace/trace_fprobe.c | 247 ++++++++++++++---- .../test.d/dynevent/add_remove_fprobe.tc | 121 +++++++++ .../test.d/dynevent/fprobe_syntax_errors.tc | 13 + 5 files changed, 349 insertions(+), 62 deletions(-) -- 2.43.0

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[PATCH RESEND] selftests/cachestat: add tmpshmcstat file to .gitignore

by Madhur Kumar

Add the tmpshmcstat file to .gitignore to avoid accidentally staging the build artifact Signed-off-by: Madhur Kumar <madhurkumar004(a)gmail.com> --- tools/testing/selftests/cachestat/.gitignore | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/cachestat/.gitignore b/tools/testing/selftests/cachestat/.gitignore index d6c30b43a4bb..abbb13b6e96b 100644 --- a/tools/testing/selftests/cachestat/.gitignore +++ b/tools/testing/selftests/cachestat/.gitignore @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0-only test_cachestat +tmpshmcstat -- 2.51.0

1 day, 2 hours

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[PATCH net 9/9] selftests: drv-net: pp_alloc_fail: add necessary optoins to config

by Jakub Kicinski

Add kernel config for error injection as needed by pp_alloc_fail.py Fixes: 9da271f825e4 ("selftests: drv-net-hw: add test for memory allocation failures with page pool") Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- CC: shuah(a)kernel.org CC: joe(a)dama.to CC: willemb(a)google.com CC: sdf(a)fomichev.me CC: almasrymina(a)google.com CC: linux-kselftest(a)vger.kernel.org --- tools/testing/selftests/drivers/net/hw/config | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/testing/selftests/drivers/net/hw/config b/tools/testing/selftests/drivers/net/hw/config index e8a06aa1471c..2307aa001be1 100644 --- a/tools/testing/selftests/drivers/net/hw/config +++ b/tools/testing/selftests/drivers/net/hw/config @@ -1,3 +1,7 @@ +CONFIG_FAIL_FUNCTION=y +CONFIG_FAULT_INJECTION=y +CONFIG_FAULT_INJECTION_DEBUG_FS=y +CONFIG_FUNCTION_ERROR_INJECTION=y CONFIG_IO_URING=y CONFIG_IPV6=y CONFIG_IPV6_GRE=y -- 2.51.0

1 day, 7 hours

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[PATCH net 7/9] selftests: drv-net: fix linter warnings in pp_alloc_fail

by Jakub Kicinski

Fix linter warnings, it's a bit hard to check for new ones otherwise. W0311: Bad indentation. Found 16 spaces, expected 12 (bad-indentation) C0114: Missing module docstring (missing-module-docstring) W1514: Using open without explicitly specifying an encoding (unspecified-encoding) C0116: Missing function or method docstring (missing-function-docstring) Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- CC: shuah(a)kernel.org CC: johndale(a)cisco.com CC: linux-kselftest(a)vger.kernel.org --- .../selftests/drivers/net/hw/pp_alloc_fail.py | 20 +++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/drivers/net/hw/pp_alloc_fail.py b/tools/testing/selftests/drivers/net/hw/pp_alloc_fail.py index ad192fef3117..fc66b7a7b149 100755 --- a/tools/testing/selftests/drivers/net/hw/pp_alloc_fail.py +++ b/tools/testing/selftests/drivers/net/hw/pp_alloc_fail.py @@ -1,6 +1,10 @@ #!/usr/bin/env python3 # SPDX-License-Identifier: GPL-2.0 +""" +Test driver resilience vs page pool allocation failures. +""" + import errno import time import os @@ -13,7 +17,8 @@ from lib.py import cmd, tool, GenerateTraffic def _write_fail_config(config): for key, value in config.items(): - with open("/sys/kernel/debug/fail_function/" + key, "w") as fp: + path = "/sys/kernel/debug/fail_function/" + with open(path + key, "w", encoding='ascii') as fp: fp.write(str(value) + "\n") @@ -22,8 +27,7 @@ from lib.py import cmd, tool, GenerateTraffic raise KsftSkipEx("Kernel built without function error injection (or DebugFS)") if not os.path.exists("/sys/kernel/debug/fail_function/page_pool_alloc_netmems"): - with open("/sys/kernel/debug/fail_function/inject", "w") as fp: - fp.write("page_pool_alloc_netmems\n") + _write_fail_config({"inject": "page_pool_alloc_netmems"}) _write_fail_config({ "verbose": 0, @@ -38,8 +42,7 @@ from lib.py import cmd, tool, GenerateTraffic return if os.path.exists("/sys/kernel/debug/fail_function/page_pool_alloc_netmems"): - with open("/sys/kernel/debug/fail_function/inject", "w") as fp: - fp.write("\n") + _write_fail_config({"inject": ""}) _write_fail_config({ "probability": 0, @@ -48,6 +51,10 @@ from lib.py import cmd, tool, GenerateTraffic def test_pp_alloc(cfg, netdevnl): + """ + Configure page pool allocation fail injection while traffic is running. + """ + def get_stats(): return netdevnl.qstats_get({"ifindex": cfg.ifindex}, dump=True)[0] @@ -105,7 +112,7 @@ from lib.py import cmd, tool, GenerateTraffic else: ksft_pr("ethtool -G change retval: did not succeed", new_g) else: - ksft_pr("ethtool -G change retval: did not try") + ksft_pr("ethtool -G change retval: did not try") time.sleep(0.1) check_traffic_flowing() @@ -119,6 +126,7 @@ from lib.py import cmd, tool, GenerateTraffic def main() -> None: + """ Ksft boiler plate main """ netdevnl = NetdevFamily() with NetDrvEpEnv(__file__, nsim_test=False) as cfg: -- 2.51.0

1 day, 7 hours

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[PATCH net 5/9] selftests: drv-net: xdp: add test for interface level qstats

by Jakub Kicinski

Send a non-trivial number of packets and make sure that they are counted correctly in qstats. Per qstats specification XDP is the first layer of the stack so we should see Rx and Tx counters go up for packets which went thru XDP. Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- CC: shuah(a)kernel.org CC: sdf(a)fomichev.me CC: linux-kselftest(a)vger.kernel.org CC: bpf(a)vger.kernel.org --- tools/testing/selftests/drivers/net/xdp.py | 91 +++++++++++++++++++++- 1 file changed, 89 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/drivers/net/xdp.py b/tools/testing/selftests/drivers/net/xdp.py index a7a4d97aa228..a148004e1c36 100755 --- a/tools/testing/selftests/drivers/net/xdp.py +++ b/tools/testing/selftests/drivers/net/xdp.py @@ -11,8 +11,9 @@ import string from dataclasses import dataclass from enum import Enum -from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_ne, ksft_pr -from lib.py import KsftFailEx, NetDrvEpEnv, EthtoolFamily, NlError +from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_ge, ksft_ne, ksft_pr +from lib.py import KsftFailEx, NetDrvEpEnv +from lib.py import EthtoolFamily, NetdevFamily, NlError from lib.py import bkg, cmd, rand_port, wait_port_listen from lib.py import ip, bpftool, defer @@ -671,6 +672,88 @@ from lib.py import ip, bpftool, defer _validate_res(res, offset_lst, pkt_sz_lst) +def _test_xdp_native_ifc_stats(cfg, act): + cfg.require_cmd("socat") + + bpf_info = BPFProgInfo("xdp_prog", "xdp_native.bpf.o", "xdp", 1500) + prog_info = _load_xdp_prog(cfg, bpf_info) + port = rand_port() + + _set_xdp_map("map_xdp_setup", TestConfig.MODE.value, act.value) + _set_xdp_map("map_xdp_setup", TestConfig.PORT.value, port) + + # Discard the input, but we need a listener to avoid ICMP errors + rx_udp = f"socat -{cfg.addr_ipver} -T 2 -u UDP-RECV:{port},reuseport " + \ + "/dev/null" + # Listener runs on "remote" in case of XDP_TX + rx_host = cfg.remote if act == XDPAction.TX else None + # We want to spew 2000 packets quickly, bash seems to do a good enough job + tx_udp = f"exec 5<>/dev/udp/{cfg.addr}/{port}; " \ + "for i in `seq 2000`; do echo a >&5; done; exec 5>&-" + + cfg.wait_hw_stats_settle() + # Qstats have more clearly defined semantics than rtnetlink. + # XDP is the "first layer of the stack" so XDP packets should be counted + # as received and sent as if the decision was made in the routing layer. + before = cfg.netnl.qstats_get({"ifindex": cfg.ifindex}, dump=True)[0] + + with bkg(rx_udp, host=rx_host, exit_wait=True): + wait_port_listen(port, proto="udp", host=rx_host) + cmd(tx_udp, host=cfg.remote, shell=True) + + cfg.wait_hw_stats_settle() + after = cfg.netnl.qstats_get({"ifindex": cfg.ifindex}, dump=True)[0] + + ksft_ge(after['rx-packets'] - before['rx-packets'], 2000) + if act == XDPAction.TX: + ksft_ge(after['tx-packets'] - before['tx-packets'], 2000) + + expected_pkts = 2000 + stats = _get_stats(prog_info["maps"]["map_xdp_stats"]) + ksft_eq(stats[XDPStats.RX.value], expected_pkts, "XDP RX stats mismatch") + if act == XDPAction.TX: + ksft_eq(stats[XDPStats.TX.value], expected_pkts, "XDP TX stats mismatch") + + # Flip the ring count back and forth to make sure the stats from XDP rings + # don't get lost. + chans = cfg.ethnl.channels_get({'header': {'dev-index': cfg.ifindex}}) + if chans.get('combined-count', 0) > 1: + cfg.ethnl.channels_set({'header': {'dev-index': cfg.ifindex}, + 'combined-count': 1}) + cfg.ethnl.channels_set({'header': {'dev-index': cfg.ifindex}, + 'combined-count': chans['combined-count']}) + before = after + after = cfg.netnl.qstats_get({"ifindex": cfg.ifindex}, dump=True)[0] + + ksft_ge(after['rx-packets'], before['rx-packets']) + if act == XDPAction.TX: + ksft_ge(after['tx-packets'], before['tx-packets']) + + +def test_xdp_native_qstats_pass(cfg): + """ + Send 2000 messages, expect XDP_PASS, make sure the packets were counted + to interface level qstats (Rx). + """ + _test_xdp_native_ifc_stats(cfg, XDPAction.PASS) + + +def test_xdp_native_qstats_drop(cfg): + """ + Send 2000 messages, expect XDP_DROP, make sure the packets were counted + to interface level qstats (Rx). + """ + _test_xdp_native_ifc_stats(cfg, XDPAction.DROP) + + +def test_xdp_native_qstats_tx(cfg): + """ + Send 2000 messages, expect XDP_TX, make sure the packets were counted + to interface level qstats (Rx and Tx) + """ + _test_xdp_native_ifc_stats(cfg, XDPAction.TX) + + def main(): """ Main function to execute the XDP tests. @@ -682,6 +765,7 @@ from lib.py import ip, bpftool, defer """ with NetDrvEpEnv(__file__) as cfg: cfg.ethnl = EthtoolFamily() + cfg.netnl = NetdevFamily() ksft_run( [ test_xdp_native_pass_sb, @@ -694,6 +778,9 @@ from lib.py import ip, bpftool, defer test_xdp_native_adjst_tail_shrnk_data, test_xdp_native_adjst_head_grow_data, test_xdp_native_adjst_head_shrnk_data, + test_xdp_native_qstats_pass, + test_xdp_native_qstats_drop, + test_xdp_native_qstats_tx, ], args=(cfg,)) ksft_exit() -- 2.51.0

1 day, 7 hours

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[PATCH net 4/9] selftests: drv-net: xdp: rename netnl to ethnl

by Jakub Kicinski

Test uses "netnl" for the ethtool family which is quite confusing (one would expect netdev family would use this name). No functional changes. Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- CC: shuah(a)kernel.org CC: sdf(a)fomichev.me CC: linux-kselftest(a)vger.kernel.org CC: bpf(a)vger.kernel.org --- tools/testing/selftests/drivers/net/xdp.py | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/drivers/net/xdp.py b/tools/testing/selftests/drivers/net/xdp.py index 08fea4230759..a7a4d97aa228 100755 --- a/tools/testing/selftests/drivers/net/xdp.py +++ b/tools/testing/selftests/drivers/net/xdp.py @@ -541,11 +541,11 @@ from lib.py import ip, bpftool, defer The HDS threshold value. If the threshold is not supported or an error occurs, a default value of 1500 is returned. """ - netnl = cfg.netnl + ethnl = cfg.ethnl hds_thresh = 1500 try: - rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}}) + rings = ethnl.rings_get({'header': {'dev-index': cfg.ifindex}}) if 'hds-thresh' not in rings: ksft_pr(f'hds-thresh not supported. Using default: {hds_thresh}') return hds_thresh @@ -562,7 +562,7 @@ from lib.py import ip, bpftool, defer Args: cfg: Configuration object containing network settings. - netnl: Network namespace or link object (not used in this function). + ethnl: Network namespace or link object (not used in this function). This function sets up the packet size and offset lists, then performs the head adjustment test by sending and receiving UDP packets. @@ -681,7 +681,7 @@ from lib.py import ip, bpftool, defer function to execute the tests. """ with NetDrvEpEnv(__file__) as cfg: - cfg.netnl = EthtoolFamily() + cfg.ethnl = EthtoolFamily() ksft_run( [ test_xdp_native_pass_sb, -- 2.51.0

1 day, 7 hours

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[PATCH net 8/9] selftests: drv-net: pp_alloc_fail: lower traffic expectations

by Jakub Kicinski

Lower the expected level of traffic in the pp_alloc_fail test and calculate failure counter thresholds based on the traffic rather than using a fixed constant. We only have "QEMU HW" in NIPA right now, and the test (due to debug dependencies) only works on debug kernels in the first place. We need some place for it to pass otherwise it seems to be bit rotting. So lower the traffic threshold so that it passes on QEMU and with a debug kernel... Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- CC: shuah(a)kernel.org CC: johndale(a)cisco.com CC: linux-kselftest(a)vger.kernel.org --- .../selftests/drivers/net/hw/pp_alloc_fail.py | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/drivers/net/hw/pp_alloc_fail.py b/tools/testing/selftests/drivers/net/hw/pp_alloc_fail.py index fc66b7a7b149..a4521a912d61 100755 --- a/tools/testing/selftests/drivers/net/hw/pp_alloc_fail.py +++ b/tools/testing/selftests/drivers/net/hw/pp_alloc_fail.py @@ -7,6 +7,7 @@ Test driver resilience vs page pool allocation failures. import errno import time +import math import os from lib.py import ksft_run, ksft_exit, ksft_pr from lib.py import KsftSkipEx, KsftFailEx @@ -62,7 +63,7 @@ from lib.py import cmd, tool, GenerateTraffic stat1 = get_stats() time.sleep(1) stat2 = get_stats() - if stat2['rx-packets'] - stat1['rx-packets'] < 15000: + if stat2['rx-packets'] - stat1['rx-packets'] < 4000: raise KsftFailEx("Traffic seems low:", stat2['rx-packets'] - stat1['rx-packets']) @@ -91,9 +92,14 @@ from lib.py import cmd, tool, GenerateTraffic if s2['rx-alloc-fail'] - s1['rx-alloc-fail'] < 1: raise KsftSkipEx("Allocation failures not increasing") - if s2['rx-alloc-fail'] - s1['rx-alloc-fail'] < 100: - raise KsftSkipEx("Allocation increasing too slowly", s2['rx-alloc-fail'] - s1['rx-alloc-fail'], - "packets:", s2['rx-packets'] - s1['rx-packets']) + pkts = s2['rx-packets'] - s1['rx-packets'] + # Expecting one failure per 512 buffers, 3.1x safety margin + want_fails = math.floor(pkts / 512 / 3.1) + seen_fails = s2['rx-alloc-fail'] - s1['rx-alloc-fail'] + if s2['rx-alloc-fail'] - s1['rx-alloc-fail'] < want_fails: + raise KsftSkipEx("Allocation increasing too slowly", seen_fails, + "packets:", pkts) + ksft_pr(f"Seen: pkts:{pkts} fails:{seen_fails} (pass thrs:{want_fails})") # Basic failures are fine, try to wobble some settings to catch extra failures check_traffic_flowing() -- 2.51.0

1 day, 7 hours

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[PATCH bpf-next] bpf_doc: Support 1st const parameter of bpf_d_path()

by Rong Tao

From: Rong Tao <rongtao(a)cestc.cn> Since commit 1b8abbb12128 ("bpf...d_path(): constify path argument"), the first parameter of the bpf_d_path() has been changed to a const constant. We need to modify the header file and bpf_doc.py. The two error messages are as follows: linux/tools/testing/selftests/bpf$ make CLNG-BPF [test_progs] bpf_iter_task_vmas.bpf.o progs/bpf_iter_task_vmas.c:52:14: error: passing 'const struct path *' to parameter of type 'struct path *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers] 52 | bpf_d_path(&file->f_path, d_path_buf, D_PATH_BUF_SIZE); | ^~~~~~~~~~~~~ 1 error generated. .... progs/verifier_vfs_accept.c:80:7: error: assigning to 'struct path *' from 'const struct path *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers] 80 | path = &file->f_path; | ^ ~~~~~~~~~~~~~ 1 error generated. Fixes: 1b8abbb12128 ("bpf...d_path(): constify path argument") Signed-off-by: Rong Tao <rongtao(a)cestc.cn> --- include/uapi/linux/bpf.h | 2 +- scripts/bpf_doc.py | 1 + tools/include/uapi/linux/bpf.h | 2 +- tools/testing/selftests/bpf/progs/verifier_vfs_accept.c | 2 +- 4 files changed, 4 insertions(+), 3 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index ae83d8649ef1..6829936d33f5 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -4891,7 +4891,7 @@ union bpf_attr { * * **-ENOENT** if the bpf_local_storage cannot be found. * - * long bpf_d_path(struct path *path, char *buf, u32 sz) + * long bpf_d_path(const struct path *path, char *buf, u32 sz) * Description * Return full path for given **struct path** object, which * needs to be the kernel BTF *path* object. The path is diff --git a/scripts/bpf_doc.py b/scripts/bpf_doc.py index c77dc40f7689..15d113a1bc1d 100755 --- a/scripts/bpf_doc.py +++ b/scripts/bpf_doc.py @@ -788,6 +788,7 @@ class PrinterHelpersHeader(Printer): 'struct task_struct', 'struct cgroup', 'struct path', + 'const struct path', 'struct btf_ptr', 'struct inode', 'struct socket', diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index ae83d8649ef1..6829936d33f5 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -4891,7 +4891,7 @@ union bpf_attr { * * **-ENOENT** if the bpf_local_storage cannot be found. * - * long bpf_d_path(struct path *path, char *buf, u32 sz) + * long bpf_d_path(const struct path *path, char *buf, u32 sz) * Description * Return full path for given **struct path** object, which * needs to be the kernel BTF *path* object. The path is diff --git a/tools/testing/selftests/bpf/progs/verifier_vfs_accept.c b/tools/testing/selftests/bpf/progs/verifier_vfs_accept.c index 3e2d76ee8050..55398c04290a 100644 --- a/tools/testing/selftests/bpf/progs/verifier_vfs_accept.c +++ b/tools/testing/selftests/bpf/progs/verifier_vfs_accept.c @@ -70,7 +70,7 @@ __success int BPF_PROG(path_d_path_from_file_argument, struct file *file) { int ret; - struct path *path; + const struct path *path; /* The f_path member is a path which is embedded directly within a * file. Therefore, a pointer to such embedded members are still -- 2.51.0

1 day, 7 hours

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[PATCH bpf-next v2 2/2] selftests/bpf: Test bpf_strcasestr,bpf_strncasestr kfuncs

by Rong Tao

From: Rong Tao <rongtao(a)cestc.cn> Add tests for new kfuncs bpf_strcasestr() and bpf_strncasestr(). Signed-off-by: Rong Tao <rongtao(a)cestc.cn> --- .../selftests/bpf/prog_tests/string_kfuncs.c | 2 ++ .../selftests/bpf/progs/string_kfuncs_failure1.c | 12 ++++++++++++ .../selftests/bpf/progs/string_kfuncs_failure2.c | 2 ++ .../selftests/bpf/progs/string_kfuncs_success.c | 13 +++++++++++++ 4 files changed, 29 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/string_kfuncs.c b/tools/testing/selftests/bpf/prog_tests/string_kfuncs.c index 4d66fad3c8bd..0f3bf594e7a5 100644 --- a/tools/testing/selftests/bpf/prog_tests/string_kfuncs.c +++ b/tools/testing/selftests/bpf/prog_tests/string_kfuncs.c @@ -20,7 +20,9 @@ static const char * const test_cases[] = { "strcspn_str", "strcspn_reject", "strstr", + "strcasestr", "strnstr", + "strncasestr", }; void run_too_long_tests(void) diff --git a/tools/testing/selftests/bpf/progs/string_kfuncs_failure1.c b/tools/testing/selftests/bpf/progs/string_kfuncs_failure1.c index 99d72c68f76a..826e6b6aff7e 100644 --- a/tools/testing/selftests/bpf/progs/string_kfuncs_failure1.c +++ b/tools/testing/selftests/bpf/progs/string_kfuncs_failure1.c @@ -45,8 +45,12 @@ SEC("syscall") __retval(USER_PTR_ERR)int test_strcspn_null1(void *ctx) { return SEC("syscall") __retval(USER_PTR_ERR)int test_strcspn_null2(void *ctx) { return bpf_strcspn("hello", NULL); } SEC("syscall") __retval(USER_PTR_ERR)int test_strstr_null1(void *ctx) { return bpf_strstr(NULL, "hello"); } SEC("syscall") __retval(USER_PTR_ERR)int test_strstr_null2(void *ctx) { return bpf_strstr("hello", NULL); } +SEC("syscall") __retval(USER_PTR_ERR)int test_strcasestr_null1(void *ctx) { return bpf_strcasestr(NULL, "hello"); } +SEC("syscall") __retval(USER_PTR_ERR)int test_strcasestr_null2(void *ctx) { return bpf_strcasestr("hello", NULL); } SEC("syscall") __retval(USER_PTR_ERR)int test_strnstr_null1(void *ctx) { return bpf_strnstr(NULL, "hello", 1); } SEC("syscall") __retval(USER_PTR_ERR)int test_strnstr_null2(void *ctx) { return bpf_strnstr("hello", NULL, 1); } +SEC("syscall") __retval(USER_PTR_ERR)int test_strncasestr_null1(void *ctx) { return bpf_strncasestr(NULL, "hello", 1); } +SEC("syscall") __retval(USER_PTR_ERR)int test_strncasestr_null2(void *ctx) { return bpf_strncasestr("hello", NULL, 1); } /* Passing userspace ptr to string kfuncs */ SEC("syscall") __retval(USER_PTR_ERR) int test_strcmp_user_ptr1(void *ctx) { return bpf_strcmp(user_ptr, "hello"); } @@ -65,8 +69,12 @@ SEC("syscall") __retval(USER_PTR_ERR) int test_strcspn_user_ptr1(void *ctx) { re SEC("syscall") __retval(USER_PTR_ERR) int test_strcspn_user_ptr2(void *ctx) { return bpf_strcspn("hello", user_ptr); } SEC("syscall") __retval(USER_PTR_ERR) int test_strstr_user_ptr1(void *ctx) { return bpf_strstr(user_ptr, "hello"); } SEC("syscall") __retval(USER_PTR_ERR) int test_strstr_user_ptr2(void *ctx) { return bpf_strstr("hello", user_ptr); } +SEC("syscall") __retval(USER_PTR_ERR) int test_strcasestr_user_ptr1(void *ctx) { return bpf_strcasestr(user_ptr, "hello"); } +SEC("syscall") __retval(USER_PTR_ERR) int test_strcasestr_user_ptr2(void *ctx) { return bpf_strcasestr("hello", user_ptr); } SEC("syscall") __retval(USER_PTR_ERR) int test_strnstr_user_ptr1(void *ctx) { return bpf_strnstr(user_ptr, "hello", 1); } SEC("syscall") __retval(USER_PTR_ERR) int test_strnstr_user_ptr2(void *ctx) { return bpf_strnstr("hello", user_ptr, 1); } +SEC("syscall") __retval(USER_PTR_ERR) int test_strncasestr_user_ptr1(void *ctx) { return bpf_strncasestr(user_ptr, "hello", 1); } +SEC("syscall") __retval(USER_PTR_ERR) int test_strncasestr_user_ptr2(void *ctx) { return bpf_strncasestr("hello", user_ptr, 1); } #endif /* __TARGET_ARCH_s390 */ @@ -87,7 +95,11 @@ SEC("syscall") __retval(-EFAULT) int test_strcspn_pagefault1(void *ctx) { return SEC("syscall") __retval(-EFAULT) int test_strcspn_pagefault2(void *ctx) { return bpf_strcspn("hello", invalid_kern_ptr); } SEC("syscall") __retval(-EFAULT) int test_strstr_pagefault1(void *ctx) { return bpf_strstr(invalid_kern_ptr, "hello"); } SEC("syscall") __retval(-EFAULT) int test_strstr_pagefault2(void *ctx) { return bpf_strstr("hello", invalid_kern_ptr); } +SEC("syscall") __retval(-EFAULT) int test_strcasestr_pagefault1(void *ctx) { return bpf_strcasestr(invalid_kern_ptr, "hello"); } +SEC("syscall") __retval(-EFAULT) int test_strcasestr_pagefault2(void *ctx) { return bpf_strcasestr("hello", invalid_kern_ptr); } SEC("syscall") __retval(-EFAULT) int test_strnstr_pagefault1(void *ctx) { return bpf_strnstr(invalid_kern_ptr, "hello", 1); } SEC("syscall") __retval(-EFAULT) int test_strnstr_pagefault2(void *ctx) { return bpf_strnstr("hello", invalid_kern_ptr, 1); } +SEC("syscall") __retval(-EFAULT) int test_strncasestr_pagefault1(void *ctx) { return bpf_strncasestr(invalid_kern_ptr, "hello", 1); } +SEC("syscall") __retval(-EFAULT) int test_strncasestr_pagefault2(void *ctx) { return bpf_strncasestr("hello", invalid_kern_ptr, 1); } char _license[] SEC("license") = "GPL"; diff --git a/tools/testing/selftests/bpf/progs/string_kfuncs_failure2.c b/tools/testing/selftests/bpf/progs/string_kfuncs_failure2.c index e41cc5601994..05e1da1f250f 100644 --- a/tools/testing/selftests/bpf/progs/string_kfuncs_failure2.c +++ b/tools/testing/selftests/bpf/progs/string_kfuncs_failure2.c @@ -19,6 +19,8 @@ SEC("syscall") int test_strspn_accept_too_long(void *ctx) { return bpf_strspn("b SEC("syscall") int test_strcspn_str_too_long(void *ctx) { return bpf_strcspn(long_str, "b"); } SEC("syscall") int test_strcspn_reject_too_long(void *ctx) { return bpf_strcspn("b", long_str); } SEC("syscall") int test_strstr_too_long(void *ctx) { return bpf_strstr(long_str, "hello"); } +SEC("syscall") int test_strcasestr_too_long(void *ctx) { return bpf_strcasestr(long_str, "hello"); } SEC("syscall") int test_strnstr_too_long(void *ctx) { return bpf_strnstr(long_str, "hello", sizeof(long_str)); } +SEC("syscall") int test_strncasestr_too_long(void *ctx) { return bpf_strncasestr(long_str, "hello", sizeof(long_str)); } char _license[] SEC("license") = "GPL"; diff --git a/tools/testing/selftests/bpf/progs/string_kfuncs_success.c b/tools/testing/selftests/bpf/progs/string_kfuncs_success.c index 2e3498e37b9c..d21330b4cc3b 100644 --- a/tools/testing/selftests/bpf/progs/string_kfuncs_success.c +++ b/tools/testing/selftests/bpf/progs/string_kfuncs_success.c @@ -33,8 +33,12 @@ __test(11) int test_strnlen(void *ctx) { return bpf_strnlen(str, 12); } __test(5) int test_strspn(void *ctx) { return bpf_strspn(str, "ehlo"); } __test(2) int test_strcspn(void *ctx) { return bpf_strcspn(str, "lo"); } __test(6) int test_strstr_found(void *ctx) { return bpf_strstr(str, "world"); } +__test(6) int test_strcasestr_found1(void *ctx) { return bpf_strcasestr(str, "world"); } +__test(6) int test_strcasestr_found2(void *ctx) { return bpf_strcasestr(str, "WORLD"); } __test(-ENOENT) int test_strstr_notfound(void *ctx) { return bpf_strstr(str, "hi"); } +__test(-ENOENT) int test_strcasestr_notfound(void *ctx) { return bpf_strcasestr(str, "hi"); } __test(0) int test_strstr_empty(void *ctx) { return bpf_strstr(str, ""); } +__test(0) int test_strcasestr_empty(void *ctx) { return bpf_strcasestr(str, ""); } __test(0) int test_strnstr_found1(void *ctx) { return bpf_strnstr("", "", 0); } __test(0) int test_strnstr_found2(void *ctx) { return bpf_strnstr(str, "hello", 5); } __test(0) int test_strnstr_found3(void *ctx) { return bpf_strnstr(str, "hello", 6); } @@ -42,5 +46,14 @@ __test(-ENOENT) int test_strnstr_notfound1(void *ctx) { return bpf_strnstr(str, __test(-ENOENT) int test_strnstr_notfound2(void *ctx) { return bpf_strnstr(str, "hello", 4); } __test(-ENOENT) int test_strnstr_notfound3(void *ctx) { return bpf_strnstr("", "a", 0); } __test(0) int test_strnstr_empty(void *ctx) { return bpf_strnstr(str, "", 1); } +__test(0) int test_strncasestr_found1(void *ctx) { return bpf_strncasestr("", "", 0); } +__test(0) int test_strncasestr_found2(void *ctx) { return bpf_strncasestr(str, "hello", 5); } +__test(0) int test_strncasestr_found3(void *ctx) { return bpf_strncasestr(str, "hello", 6); } +__test(0) int test_strncasestr_found4(void *ctx) { return bpf_strncasestr(str, "HELLO", 5); } +__test(0) int test_strncasestr_found5(void *ctx) { return bpf_strncasestr(str, "HELLO", 6); } +__test(-ENOENT) int test_strncasestr_notfound1(void *ctx) { return bpf_strncasestr(str, "hi", 10); } +__test(-ENOENT) int test_strncasestr_notfound2(void *ctx) { return bpf_strncasestr(str, "hello", 4); } +__test(-ENOENT) int test_strncasestr_notfound3(void *ctx) { return bpf_strncasestr("", "a", 0); } +__test(0) int test_strncasestr_empty(void *ctx) { return bpf_strncasestr(str, "", 1); } char _license[] SEC("license") = "GPL"; -- 2.51.0

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[PATCH bpf-next v2 1/2] bpf: add bpf_strcasestr,bpf_strncasestr kfuncs

by Rong Tao

From: Rong Tao <rongtao(a)cestc.cn> bpf_strcasestr() and bpf_strncasestr() functions perform same like bpf_strstr() and bpf_strnstr() except ignoring the case of the characters. Signed-off-by: Rong Tao <rongtao(a)cestc.cn> --- kernel/bpf/helpers.c | 96 ++++++++++++++++++++++++++++++++++---------- 1 file changed, 75 insertions(+), 21 deletions(-) diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index c9fab9a356df..4df902e5f208 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -3675,34 +3675,20 @@ __bpf_kfunc int bpf_strcspn(const char *s__ign, const char *reject__ign) return -EFAULT; } -/** - * bpf_strnstr - Find the first substring in a length-limited string - * @s1__ign: The string to be searched - * @s2__ign: The string to search for - * @len: the maximum number of characters to search - * - * Return: - * * >=0 - Index of the first character of the first occurrence of @s2__ign - * within the first @len characters of @s1__ign - * * %-ENOENT - @s2__ign not found in the first @len characters of @s1__ign - * * %-EFAULT - Cannot read one of the strings - * * %-E2BIG - One of the strings is too large - * * %-ERANGE - One of the strings is outside of kernel address space - */ -__bpf_kfunc int bpf_strnstr(const char *s1__ign, const char *s2__ign, size_t len) +int __bpf_strnstr(const char *s1, const char *s2, size_t len, bool ignore_case) { char c1, c2; int i, j; - if (!copy_from_kernel_nofault_allowed(s1__ign, 1) || - !copy_from_kernel_nofault_allowed(s2__ign, 1)) { + if (!copy_from_kernel_nofault_allowed(s1, 1) || + !copy_from_kernel_nofault_allowed(s2, 1)) { return -ERANGE; } guard(pagefault)(); for (i = 0; i < XATTR_SIZE_MAX; i++) { for (j = 0; i + j <= len && j < XATTR_SIZE_MAX; j++) { - __get_kernel_nofault(&c2, s2__ign + j, char, err_out); + __get_kernel_nofault(&c2, s2 + j, char, err_out); if (c2 == '\0') return i; /* @@ -3712,7 +3698,13 @@ __bpf_kfunc int bpf_strnstr(const char *s1__ign, const char *s2__ign, size_t len */ if (i + j == len) break; - __get_kernel_nofault(&c1, s1__ign + j, char, err_out); + __get_kernel_nofault(&c1, s1 + j, char, err_out); + + if (ignore_case) { + c1 = tolower(c1); + c2 = tolower(c2); + } + if (c1 == '\0') return -ENOENT; if (c1 != c2) @@ -3722,7 +3714,7 @@ __bpf_kfunc int bpf_strnstr(const char *s1__ign, const char *s2__ign, size_t len return -E2BIG; if (i + j == len) return -ENOENT; - s1__ign++; + s1++; } return -E2BIG; err_out: @@ -3744,8 +3736,68 @@ __bpf_kfunc int bpf_strnstr(const char *s1__ign, const char *s2__ign, size_t len */ __bpf_kfunc int bpf_strstr(const char *s1__ign, const char *s2__ign) { - return bpf_strnstr(s1__ign, s2__ign, XATTR_SIZE_MAX); + return __bpf_strnstr(s1__ign, s2__ign, XATTR_SIZE_MAX, false); +} + +/** + * bpf_strcasestr - Find the first substring in a string, ignoring the case of + * the characters + * @s1__ign: The string to be searched + * @s2__ign: The string to search for + * + * Return: + * * >=0 - Index of the first character of the first occurrence of @s2__ign + * within @s1__ign + * * %-ENOENT - @s2__ign is not a substring of @s1__ign + * * %-EFAULT - Cannot read one of the strings + * * %-E2BIG - One of the strings is too large + * * %-ERANGE - One of the strings is outside of kernel address space + */ +__bpf_kfunc int bpf_strcasestr(const char *s1__ign, const char *s2__ign) +{ + return __bpf_strnstr(s1__ign, s2__ign, XATTR_SIZE_MAX, true); } + +/** + * bpf_strnstr - Find the first substring in a length-limited string + * @s1__ign: The string to be searched + * @s2__ign: The string to search for + * @len: the maximum number of characters to search + * + * Return: + * * >=0 - Index of the first character of the first occurrence of @s2__ign + * within the first @len characters of @s1__ign + * * %-ENOENT - @s2__ign not found in the first @len characters of @s1__ign + * * %-EFAULT - Cannot read one of the strings + * * %-E2BIG - One of the strings is too large + * * %-ERANGE - One of the strings is outside of kernel address space + */ +__bpf_kfunc int bpf_strnstr(const char *s1__ign, const char *s2__ign, size_t len) +{ + return __bpf_strnstr(s1__ign, s2__ign, len, false); +} + +/** + * bpf_strnstr - Find the first substring in a length-limited string, ignoring + * the case of the characters + * @s1__ign: The string to be searched + * @s2__ign: The string to search for + * @len: the maximum number of characters to search + * + * Return: + * * >=0 - Index of the first character of the first occurrence of @s2__ign + * within the first @len characters of @s1__ign + * * %-ENOENT - @s2__ign not found in the first @len characters of @s1__ign + * * %-EFAULT - Cannot read one of the strings + * * %-E2BIG - One of the strings is too large + * * %-ERANGE - One of the strings is outside of kernel address space + */ +__bpf_kfunc int bpf_strncasestr(const char *s1__ign, const char *s2__ign, + size_t len) +{ + return __bpf_strnstr(s1__ign, s2__ign, len, true); +} + #ifdef CONFIG_KEYS /** * bpf_lookup_user_key - lookup a key by its serial @@ -4367,7 +4419,9 @@ BTF_ID_FLAGS(func, bpf_strnlen); BTF_ID_FLAGS(func, bpf_strspn); BTF_ID_FLAGS(func, bpf_strcspn); BTF_ID_FLAGS(func, bpf_strstr); +BTF_ID_FLAGS(func, bpf_strcasestr); BTF_ID_FLAGS(func, bpf_strnstr); +BTF_ID_FLAGS(func, bpf_strncasestr); #if defined(CONFIG_BPF_LSM) && defined(CONFIG_CGROUPS) BTF_ID_FLAGS(func, bpf_cgroup_read_xattr, KF_RCU) #endif -- 2.51.0

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