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These are three simple changes.

Browse Source 
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.
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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()
This commit is contained in:
Linus Torvalds 2017-05-08 20:36:38 -07:00
commit 00d9593335
2 changed files with 10 additions and 12 deletions
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20
kernel/trace/ftrace.c
View File

@ -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)

2
kernel/trace/trace.c
View File

@ -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, "<...>");
}