From: Arnaldo Carvalho de Melo Date: Tue, 21 Aug 2018 18:02:09 +0000 (-0300) Subject: perf trace: Add a etcsnoop.c augmented syscalls eBPF utility X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=9ab5aadebeddc77fccfdf94a048259315ce95fe1;p=openwrt%2Fstaging%2Fblogic.git perf trace: Add a etcsnoop.c augmented syscalls eBPF utility We need to put common stuff into a separate header in tools/perf/include/bpf/ for these augmented syscalls, but I couldn't resist adding a etcsnoop.c tool, combining augmented syscalls + filtering, that in the future will be passed from 'perf trace''s command line, to use in building the eBPF program to do that specific filtering at the source, inside the kernel: Running system wide: (hope there isn't any embarassing stuff here... ;-) ) # perf trace -e tools/perf/examples/bpf/etcsnoop.c 0.000 sed/21878 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 1741.473 cat/21883 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 1741.892 cat/21883 openat(dfd: CWD, filename: /etc/passwd) 1748.948 sed/21886 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 1777.136 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1777.738 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1778.158 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1778.528 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1778.595 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1778.901 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1778.939 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1778.966 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1778.992 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.019 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.045 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.071 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.095 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.121 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.148 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.175 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.202 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.229 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.254 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.279 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.309 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.336 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.363 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.388 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.414 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.442 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.470 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.500 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.529 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.557 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.586 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.617 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.648 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.679 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.706 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.739 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.769 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.798 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.823 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.844 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.862 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.880 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.911 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.942 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1779.972 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1780.004 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 1780.035 gvfs-udisks2-v/2302 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 13059.154 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13060.739 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13061.990 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13063.177 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13064.265 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13065.483 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13067.383 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13068.902 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13069.922 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13070.915 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13072.612 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13074.816 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13077.343 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13078.731 NetworkManager/1237 open(filename: /etc/passwd, flags: CLOEXEC) 13559.064 DNS Res~er #22/21054 open(filename: /etc/hosts, flags: CLOEXEC) 22419.522 sed/21896 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 24473.313 git/21900 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 24491.988 less/21901 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 24493.793 git/21901 openat(dfd: CWD, filename: /etc/sysless) 24565.772 sed/21924 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 25878.752 git/21928 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 26075.666 git/21928 open(filename: /etc/localtime, flags: CLOEXEC) 26075.565 less/21929 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 26076.060 less/21929 openat(dfd: CWD, filename: /etc/sysless) 26346.395 sed/21932 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 26483.583 sed/21938 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 26954.890 sed/21944 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 27016.165 gsd-color/1762 openat(dfd: CWD, filename: /etc/localtime) 27016.414 gsd-color/1762 openat(dfd: CWD, filename: /etc/localtime) 27712.313 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime) 27712.616 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime) 27829.035 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 27829.368 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 27829.584 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 27829.800 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 27830.107 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 27830.521 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 27961.516 git/21948 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 27987.568 less/21949 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 27988.948 bash/21949 openat(dfd: CWD, filename: /etc/sysless) 28043.536 sed/21972 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 28736.008 sed/21978 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 34882.664 git/21991 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 34882.664 sort/21990 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 34884.441 uniq/21992 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 35593.098 git/21997 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 35638.839 git/21997 openat(dfd: CWD, filename: /etc/gitattributes) 35702.851 sed/22000 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 36076.039 sed/22006 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 37569.049 git/22014 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 37673.712 git/22014 open(filename: /etc/localtime, flags: CLOEXEC) 37781.710 vim/22040 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 37783.667 git/22040 openat(dfd: CWD, filename: /etc/vimrc) 37792.394 git/22040 open(filename: /etc/nsswitch.conf, flags: CLOEXEC) 37792.436 git/22040 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 37792.580 git/22040 open(filename: /etc/passwd, flags: CLOEXEC) 43893.625 DNS Res~er #23/21365 open(filename: /etc/hosts, flags: CLOEXEC) 48060.409 nm-dhcp-helper/22044 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48071.745 systemd/1 openat(dfd: CWD, filename: /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service, flags: CLOEXEC|NOFOLLOW|NOCTTY) 48082.780 nm-dispatcher/22049 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48111.418 systemd/22049 open(filename: /etc/NetworkManager/dispatcher.d, flags: CLOEXEC|DIRECTORY|NONBLOCK) 48111.904 systemd/22049 open(filename: /etc/localtime, flags: CLOEXEC) 48118.357 00-netreport/22052 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48119.668 systemd/22052 open(filename: /etc/nsswitch.conf, flags: CLOEXEC) 48119.762 systemd/22052 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48119.887 systemd/22052 open(filename: /etc/passwd, flags: CLOEXEC) 48120.025 systemd/22052 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/00-netreport) 48124.144 hostname/22054 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48125.492 systemd/22052 openat(dfd: CWD, filename: /etc/init.d/functions) 48127.253 systemd/22052 openat(dfd: CWD, filename: /etc/profile.d/lang.sh) 48127.388 systemd/22052 openat(dfd: CWD, filename: /etc/locale.conf) 48137.749 cat/22056 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48143.519 04-iscsi/22058 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48144.438 04-iscsi/22058 open(filename: /etc/nsswitch.conf, flags: CLOEXEC) 48144.478 04-iscsi/22058 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48144.577 04-iscsi/22058 open(filename: /etc/passwd, flags: CLOEXEC) 48144.819 04-iscsi/22058 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/04-iscsi) 48145.620 10-ifcfg-rh-ro/22059 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48146.169 systemd/22059 open(filename: /etc/nsswitch.conf, flags: CLOEXEC) 48146.207 systemd/22059 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48146.287 systemd/22059 open(filename: /etc/passwd, flags: CLOEXEC) 48146.387 systemd/22059 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/10-ifcfg-rh-routes.sh) 48147.215 11-dhclient/22060 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48147.787 11-dhclient/22060 open(filename: /etc/nsswitch.conf, flags: CLOEXEC) 48147.813 11-dhclient/22060 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48147.929 11-dhclient/22060 open(filename: /etc/passwd, flags: CLOEXEC) 48148.016 11-dhclient/22060 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/11-dhclient) 48148.906 grep/22063 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48151.165 11-dhclient/22060 openat(dfd: CWD, filename: /etc/sysconfig/network) 48151.560 11-dhclient/22060 open(filename: /etc/dhcp/dhclient.d/, flags: CLOEXEC|DIRECTORY|NONBLOCK) 48151.704 11-dhclient/22060 openat(dfd: CWD, filename: /etc/dhcp/dhclient.d/chrony.sh) 48153.593 20-chrony/22065 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48154.695 20-chrony/22065 open(filename: /etc/nsswitch.conf, flags: CLOEXEC) 48154.756 20-chrony/22065 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48154.914 20-chrony/22065 open(filename: /etc/passwd, flags: CLOEXEC) 48155.067 20-chrony/22065 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/20-chrony) 48156.962 25-polipo/22066 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48157.824 systemd/22066 open(filename: /etc/nsswitch.conf, flags: CLOEXEC) 48157.866 systemd/22066 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) 48157.981 systemd/22066 open(filename: /etc/passwd, flags: CLOEXEC) 48158.090 systemd/22066 openat(dfd: CWD, filename: /etc/NetworkManager/dispatcher.d/25-polipo) 48533.616 gsd-housekeepi/2412 openat(dfd: CWD, filename: /etc/fstab, flags: CLOEXEC) 87122.021 gsd-color/1762 openat(dfd: CWD, filename: /etc/localtime) 87122.146 gsd-color/1762 openat(dfd: CWD, filename: /etc/localtime) 87825.582 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime) 87825.844 gsd-color/2408 openat(dfd: CWD, filename: /etc/localtime) 87829.524 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 87830.531 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 87831.288 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 87832.011 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 87832.672 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) 87833.276 gnome-shell/2125 openat(dfd: CWD, filename: /etc/localtime) ^C# Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-0o770jvdcy04ee6vhv6v471m@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/examples/bpf/etcsnoop.c b/tools/perf/examples/bpf/etcsnoop.c new file mode 100644 index 000000000000..b59e8812ee8c --- /dev/null +++ b/tools/perf/examples/bpf/etcsnoop.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Augment the filename syscalls with the contents of the filename pointer argument + * filtering only those that do not start with /etc/. + * + * Test it with: + * + * perf trace -e tools/perf/examples/bpf/augmented_syscalls.c cat /etc/passwd > /dev/null + * + * It'll catch some openat syscalls related to the dynamic linked and + * the last one should be the one for '/etc/passwd'. + * + * This matches what is marshalled into the raw_syscall:sys_enter payload + * expected by the 'perf trace' beautifiers, and can be used by them unmodified, + * which will be done as that feature is implemented in the next csets, for now + * it will appear in a dump done by the default tracepoint handler in 'perf trace', + * that uses bpf_output__fprintf() to just dump those contents, as done with + * the bpf-output event associated with the __bpf_output__ map declared in + * tools/perf/include/bpf/stdio.h. + */ + +#include + +struct bpf_map SEC("maps") __augmented_syscalls__ = { + .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY, + .key_size = sizeof(int), + .value_size = sizeof(u32), + .max_entries = __NR_CPUS__, +}; + +struct augmented_filename { + int size; + int reserved; + char value[64]; +}; + +#define augmented_filename_syscall_enter(syscall) \ +struct augmented_enter_##syscall##_args { \ + struct syscall_enter_##syscall##_args args; \ + struct augmented_filename filename; \ +}; \ +int syscall_enter(syscall)(struct syscall_enter_##syscall##_args *args) \ +{ \ + char etc[6] = "/etc/"; \ + struct augmented_enter_##syscall##_args augmented_args = { .filename.reserved = 0, }; \ + probe_read(&augmented_args.args, sizeof(augmented_args.args), args); \ + augmented_args.filename.size = probe_read_str(&augmented_args.filename.value, \ + sizeof(augmented_args.filename.value), \ + args->filename_ptr); \ + if (__builtin_memcmp(augmented_args.filename.value, etc, 4) != 0) \ + return 0; \ + perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, \ + &augmented_args, \ + (sizeof(augmented_args) - sizeof(augmented_args.filename.value) + \ + augmented_args.filename.size)); \ + return 0; \ +} + +struct syscall_enter_openat_args { + unsigned long long common_tp_fields; + long syscall_nr; + long dfd; + char *filename_ptr; + long flags; + long mode; +}; + +augmented_filename_syscall_enter(openat); + +struct syscall_enter_open_args { + unsigned long long common_tp_fields; + long syscall_nr; + char *filename_ptr; + long flags; + long mode; +}; + +augmented_filename_syscall_enter(open); + +license(GPL);