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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-08 20:36:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-08 20:36:38 -0700 |
| commit | 00d959333513a41959d3b85ba3e35320ec8844e5 (patch) | |
| tree | e162a6aa9c203740629e3756b38dceb11968adae | |
| parent | 3341713c67d5eae5c68bab30add97e9f9ecfafa5 (diff) | |
| parent | 77c0eddeeeee14bf0fb0c0bb97e782981bbcf084 (diff) | |
| download | linux-00d959333513a41959d3b85ba3e35320ec8844e5.tar.gz | |
Merge tag 'trace-v4.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull more tracing updates from Steven Rostedt: "These are three simple changes. The first one is just a switch from using strcpy() to strlcpy(). Someone thought that it may cause an overflow bug, but since it only copies comms into a pre-allocated array of TASK_COMM_LEN, and no comm should ever be bigger than that, nor not end with a nul character, this change is more of a safety precaution than fixing anything that is actually broken. The other two changes are simply cleaning and optimizing some code" * tag 'trace-v4.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: ftrace: Simplify ftrace_match_record() even more ftrace: Remove an unneeded condition tracing: Use strlcpy() instead of strcpy() in __trace_find_cmdline()
| -rw-r--r-- | kernel/trace/ftrace.c | 20 | ||||
| -rw-r--r-- | kernel/trace/trace.c | 2 |
2 files changed, 10 insertions, 12 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 00077a57b746..39dca4e86a94 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -3631,22 +3631,20 @@ ftrace_match_record(struct dyn_ftrace *rec, struct ftrace_glob *func_g, /* blank module name to match all modules */ if (!mod_g->len) { /* blank module globbing: modname xor exclude_mod */ - if ((!exclude_mod) != (!modname)) + if (!exclude_mod != !modname) goto func_match; return 0; } - /* not matching the module */ - if (!modname || !mod_matches) { - if (exclude_mod) - goto func_match; - else - return 0; - } - - if (mod_matches && exclude_mod) + /* + * exclude_mod is set to trace everything but the given + * module. If it is set and the module matches, then + * return 0. If it is not set, and the module doesn't match + * also return 0. Otherwise, check the function to see if + * that matches. + */ + if (!mod_matches == !exclude_mod) return 0; - func_match: /* blank search means to match all funcs in the mod */ if (!func_g->len) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 80eda7d254ed..4ad4420b33d6 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1976,7 +1976,7 @@ static void __trace_find_cmdline(int pid, char comm[]) map = savedcmd->map_pid_to_cmdline[pid]; if (map != NO_CMDLINE_MAP) - strcpy(comm, get_saved_cmdlines(map)); + strlcpy(comm, get_saved_cmdlines(map), TASK_COMM_LEN); else strcpy(comm, "<...>"); } |