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| author | Harvey Harrison <harvey.harrison@gmail.com> | 2008-10-09 02:44:55 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-14 10:39:26 +0200 |
| commit | ad0a3b68114e8f3c25ac0045b45a2838f23e3b3a (patch) | |
| tree | bd7d7b9255276b6d9fecdf7bf0ef632196d07a6b | |
| parent | ftrace: fix hex output mode of ftrace (diff) | |
| download | linux-ad0a3b68114e8f3c25ac0045b45a2838f23e3b3a.tar.xz linux-ad0a3b68114e8f3c25ac0045b45a2838f23e3b3a.zip | |
trace: add build-time check to avoid overrunning hex buffer
Remove the runtime BUG_ON and change to a compile-time check in
the macro that calls the hex format routine
[Noticed by Joe Perches]
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/trace/trace.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 36cbb873845f..d345d649d073 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -335,7 +335,8 @@ trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) return len; } -#define HEX_CHARS 17 +#define MAX_MEMHEX_BYTES 8 +#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) static int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) @@ -344,8 +345,6 @@ trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) unsigned char *data = mem; int i, j; - BUG_ON(len >= HEX_CHARS); - #ifdef __BIG_ENDIAN for (i = 0, j = 0; i < len; i++) { #else @@ -1668,6 +1667,7 @@ do { \ #define SEQ_PUT_HEX_FIELD_RET(s, x) \ do { \ + BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ return 0; \ } while (0) |