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kallsyms: make KSYM_NAME_LEN include space for trailing '\0'

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KSYM_NAME_LEN is peculiar in that it does not include the space for the
trailing '\0', forcing all users to use KSYM_NAME_LEN + 1 when allocating
buffer.  This is nonsense and error-prone.  Moreover, when the caller
forgets that it's very likely to subtly bite back by corrupting the stack
because the last position of the buffer is always cleared to zero.

This patch increments KSYM_NAME_LEN by one and updates code accordingly.

* off-by-one bug in asm-powerpc/kprobes.h::kprobe_lookup_name() macro
  is fixed.

* Where MODULE_NAME_LEN and KSYM_NAME_LEN were used together,
  MODULE_NAME_LEN was treated as if it didn't include space for the
  trailing '\0'.  Fix it.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Paulo Marques <pmarques@grupopie.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tejun Heo
2007-07-17 04:03:51 -07:00
committed by Linus Torvalds
parent b45d527974
commit 9281acea6a
11 changed files with 27 additions and 27 deletions
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4
scripts/kallsyms.c
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@ -31,7 +31,7 @@
#include <string.h>
#include <ctype.h>
#define KSYM_NAME_LEN 127
#define KSYM_NAME_LEN 128
struct sym_entry {
@ -254,7 +254,7 @@ static void write_src(void)
unsigned int i, k, off;
unsigned int best_idx[256];
unsigned int *markers;
char buf[KSYM_NAME_LEN+1];
char buf[KSYM_NAME_LEN];
printf("#include <asm/types.h>\n");
printf("#if BITS_PER_LONG == 64\n");