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perf augmented_raw_syscalls: Copy strings from all syscalls with 1st or 2nd string arg

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Gets the augmented_raw_syscalls a bit more useful as-is, add a comment
stating that the intent is to have all this in a map populated by
userspace via the 'syscalls' BPF map, that right now has only a flag
stating if the syscall is filtered or not.

With it:

  # grep -B1 augmented_raw ~/.perfconfig
  [trace]
	add_events = /home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.o
  #
  # perf trace -e string
  weechat/6001 stat("/etc/localtime", 0x7ffe22c23d10)  = 0
  gnome-shell/1943 openat(AT_FDCWD, "/proc/self/stat", O_RDONLY) = 81
  weechat/6001 stat("/etc/localtime", 0x7ffe22c23d10)  = 0
  gmain/2475 inotify_add_watch(20<anon_inode:inotify>, "/home/acme/.config/firewall", 16789454) = -1 ENOENT (No such file or directory)
  gmain/2391 inotify_add_watch(3<anon_inode:inotify>, "", 16789454) = -1 ENOENT (No such file or directory)
  gmain/2391 inotify_add_watch(3<anon_inode:inotify>, "/var/cache/app-info/yaml", 16789454) = -1 ENOENT (No such file or directory)
  gmain/2391 inotify_add_watch(3<anon_inode:inotify>, "/var/lib/app-info/xmls", 16789454) = -1 ENOENT (No such file or directory)
  gmain/2391 inotify_add_watch(3<anon_inode:inotify>, "/var/lib/app-info/yaml", 16789454) = -1 ENOENT (No such file or directory)
  gmain/2391 inotify_add_watch(3<anon_inode:inotify>, "/usr/share/app-info/yaml", 16789454) = -1 ENOENT (No such file or directory)
  gmain/2391 inotify_add_watch(3<anon_inode:inotify>, "/usr/local/share/app-info/xmls", 16789454) = -1 ENOENT (No such file or directory)
  gmain/2391 inotify_add_watch(3<anon_inode:inotify>, "/usr/local/share/app-info/yaml", 16789454) = -1 ENOENT (No such file or directory)
  gmain/2391 inotify_add_watch(3<anon_inode:inotify>, "/home/acme/.local/share/app-info/yaml", 16789454) = -1 ENOENT (No such file or directory)
  gmain/1121 inotify_add_watch(12<anon_inode:inotify>, "/etc/NetworkManager/VPN", 16789454) = -1 ENOENT (No such file or directory)
  weechat/6001 stat("/etc/localtime", 0x7ffe22c23d10)  = 0
  gmain/2050 inotify_add_watch(8<anon_inode:inotify>, "/home/acme/~", 16789454) = -1 ENOENT (No such file or directory)
  gmain/2521 inotify_add_watch(6<anon_inode:inotify>, "/var/lib/fwupd/remotes.d/lvfs-testing", 16789454) = -1 ENOENT (No such file or directory)
  weechat/6001 stat("/etc/localtime", 0x7ffe22c23d10)  = 0
  DOM Worker/22714  ... [continued]: openat())             = 257
  FS Broker 3982/3990 openat(AT_FDCWD, "/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY) = 187
  DOMCacheThread/16652 mkdir("/home/acme/.mozilla/firefox/ina67tev.default/storage/default/https+++web.whatsapp.com/cache/morgue/192", S_IRUGO|S_IXUGO|S_IWUSR) = -1 EEXIST (File exists)
  ^C#

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-a1hxffoy8t43e0wq6bzhp23u@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-03-22 14:25:14 -03:00
parent 2b64b2ed27
commit c52a82f779
1 changed files with 147 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

150
tools/perf/examples/bpf/augmented_raw_syscalls.c
View File

@ -44,9 +44,78 @@ struct augmented_filename {
char value[256];
};
#define SYS_OPEN 2
#define SYS_ACCESS 21
#define SYS_OPENAT 257
/* syscalls where the first arg is a string */
#define SYS_OPEN 2
#define SYS_STAT 4
#define SYS_LSTAT 6
#define SYS_ACCESS 21
#define SYS_EXECVE 59
#define SYS_TRUNCATE 76
#define SYS_CHDIR 80
#define SYS_RENAME 82
#define SYS_MKDIR 83
#define SYS_RMDIR 84
#define SYS_CREAT 85
#define SYS_LINK 86
#define SYS_UNLINK 87
#define SYS_SYMLINK 88
#define SYS_READLINK 89
#define SYS_CHMOD 90
#define SYS_CHOWN 92
#define SYS_LCHOWN 94
#define SYS_MKNOD 133
#define SYS_STATFS 137
#define SYS_PIVOT_ROOT 155
#define SYS_CHROOT 161
#define SYS_ACCT 163
#define SYS_SWAPON 167
#define SYS_SWAPOFF 168
#define SYS_DELETE_MODULE 176
#define SYS_SETXATTR 188
#define SYS_LSETXATTR 189
#define SYS_GETXATTR 191
#define SYS_LGETXATTR 192
#define SYS_LISTXATTR 194
#define SYS_LLISTXATTR 195
#define SYS_REMOVEXATTR 197
#define SYS_LREMOVEXATTR 198
#define SYS_MQ_OPEN 240
#define SYS_MQ_UNLINK 241
#define SYS_ADD_KEY 248
#define SYS_REQUEST_KEY 249
#define SYS_SYMLINKAT 266
#define SYS_MEMFD_CREATE 319
/* syscalls where the first arg is a string */
#define SYS_PWRITE64 18
#define SYS_EXECVE 59
#define SYS_RENAME 82
#define SYS_QUOTACTL 179
#define SYS_FSETXATTR 190
#define SYS_FGETXATTR 193
#define SYS_FREMOVEXATTR 199
#define SYS_MQ_TIMEDSEND 242
#define SYS_REQUEST_KEY 249
#define SYS_INOTIFY_ADD_WATCH 254
#define SYS_OPENAT 257
#define SYS_MKDIRAT 258
#define SYS_MKNODAT 259
#define SYS_FCHOWNAT 260
#define SYS_FUTIMESAT 261
#define SYS_NEWFSTATAT 262
#define SYS_UNLINKAT 263
#define SYS_RENAMEAT 264
#define SYS_LINKAT 265
#define SYS_READLINKAT 267
#define SYS_FCHMODAT 268
#define SYS_FACCESSAT 269
#define SYS_UTIMENSAT 280
#define SYS_NAME_TO_HANDLE_AT 303
#define SYS_FINIT_MODULE 313
#define SYS_RENAMEAT2 316
#define SYS_EXECVEAT 322
#define SYS_STATX 332
pid_filter(pids_filtered);
@ -109,11 +178,86 @@ int sys_enter(struct syscall_enter_args *args)
*
* after the ctx memory access to prevent their down stream merging.
*/
/*
* This table of what args are strings will be provided by userspace,
* in the syscalls map, i.e. we will already have to do the lookup to
* see if this specific syscall is filtered, so we can as well get more
* info about what syscall args are strings or pointers, and how many
* bytes to copy, per arg, etc.
*
* For now hard code it, till we have all the basic mechanisms in place
* to automate everything and make the kernel part be completely driven
* by information obtained in userspace for each kernel version and
* processor architecture, making the kernel part the same no matter what
* kernel version or processor architecture it runs on.
*/
switch (augmented_args.args.syscall_nr) {
case SYS_ACCT:
case SYS_ADD_KEY:
case SYS_CHDIR:
case SYS_CHMOD:
case SYS_CHOWN:
case SYS_CHROOT:
case SYS_CREAT:
case SYS_DELETE_MODULE:
case SYS_EXECVE:
case SYS_GETXATTR:
case SYS_LCHOWN:
case SYS_LGETXATTR:
case SYS_LINK:
case SYS_LISTXATTR:
case SYS_LLISTXATTR:
case SYS_LREMOVEXATTR:
case SYS_LSETXATTR:
case SYS_LSTAT:
case SYS_MEMFD_CREATE:
case SYS_MKDIR:
case SYS_MKNOD:
case SYS_MQ_OPEN:
case SYS_MQ_UNLINK:
case SYS_PIVOT_ROOT:
case SYS_READLINK:
case SYS_REMOVEXATTR:
case SYS_RENAME:
case SYS_REQUEST_KEY:
case SYS_RMDIR:
case SYS_SETXATTR:
case SYS_STAT:
case SYS_STATFS:
case SYS_SWAPOFF:
case SYS_SWAPON:
case SYS_SYMLINK:
case SYS_SYMLINKAT:
case SYS_TRUNCATE:
case SYS_UNLINK:
case SYS_ACCESS:
case SYS_OPEN: filename_arg = (const void *)args->args[0];
__asm__ __volatile__("": : :"memory");
break;
case SYS_EXECVEAT:
case SYS_FACCESSAT:
case SYS_FCHMODAT:
case SYS_FCHOWNAT:
case SYS_FGETXATTR:
case SYS_FINIT_MODULE:
case SYS_FREMOVEXATTR:
case SYS_FSETXATTR:
case SYS_FUTIMESAT:
case SYS_INOTIFY_ADD_WATCH:
case SYS_LINKAT:
case SYS_MKDIRAT:
case SYS_MKNODAT:
case SYS_MQ_TIMEDSEND:
case SYS_NAME_TO_HANDLE_AT:
case SYS_NEWFSTATAT:
case SYS_PWRITE64:
case SYS_QUOTACTL:
case SYS_READLINKAT:
case SYS_RENAMEAT:
case SYS_RENAMEAT2:
case SYS_STATX:
case SYS_UNLINKAT:
case SYS_UTIMENSAT:
case SYS_OPENAT: filename_arg = (const void *)args->args[1];
break;
}