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KSYM_SYMBOL_LEN fixes

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Miles Lane tailing /sys files hit a BUG which Pekka Enberg has tracked
to my 966c8c12dc sprint_symbol(): use
less stack exposing a bug in slub's list_locations() -
kallsyms_lookup() writes a 0 to namebuf[KSYM_NAME_LEN-1], but that was
beyond the end of page provided.

The 100 slop which list_locations() allows at end of page looks roughly
enough for all the other stuff it might print after the symbol before
it checks again: break out KSYM_SYMBOL_LEN earlier than before.

Latencytop and ftrace and are using KSYM_NAME_LEN buffers where they
need KSYM_SYMBOL_LEN buffers, and vmallocinfo a 2*KSYM_NAME_LEN buffer
where it wants a KSYM_SYMBOL_LEN buffer: fix those before anyone copies
them.

[[email protected]: ftrace.h needs module.h]
Signed-off-by: Hugh Dickins <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc Miles Lane <[email protected]>
Acked-by: Pekka Enberg <[email protected]>
Acked-by: Steven Rostedt <[email protected]>
Acked-by: Frederic Weisbecker <[email protected]>
Cc: Rusty Russell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2008-12-09 13:14:27 -08:00 • committed by Linus Torvalds
commit 9c24624727
5 changed files with 6 additions and 5 deletions
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2
fs/proc/base.c
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@ -371,7 +371,7 @@ static int lstats_show_proc(struct seq_file *m, void *v)
task->latency_record[i].time,
task->latency_record[i].max);
for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
char sym[KSYM_NAME_LEN];
char sym[KSYM_SYMBOL_LEN];
char *c;
if (!task->latency_record[i].backtrace[q])
break;