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author | Marco Elver <elver@google.com> | 2021-11-30 12:44:16 +0100 |
---|---|---|
committer | Paul E. McKenney <paulmck@kernel.org> | 2021-12-09 16:42:27 -0800 |
commit | be3f6967ec5947dd7b2f23bf9d42bb2729889618 (patch) | |
tree | 8adcbc48ba56834a4dccdbc45134256891b424f2 | |
parent | 3cc21a531252e6693ee989231d5abee6812cfd71 (diff) | |
download | linux-be3f6967ec5947dd7b2f23bf9d42bb2729889618.tar.bz2 |
kcsan: Show location access was reordered to
Also show the location the access was reordered to. An example report:
| ==================================================================
| BUG: KCSAN: data-race in test_kernel_wrong_memorder / test_kernel_wrong_memorder
|
| read-write to 0xffffffffc01e61a8 of 8 bytes by task 2311 on cpu 5:
| test_kernel_wrong_memorder+0x57/0x90
| access_thread+0x99/0xe0
| kthread+0x2ba/0x2f0
| ret_from_fork+0x22/0x30
|
| read-write (reordered) to 0xffffffffc01e61a8 of 8 bytes by task 2310 on cpu 7:
| test_kernel_wrong_memorder+0x57/0x90
| access_thread+0x99/0xe0
| kthread+0x2ba/0x2f0
| ret_from_fork+0x22/0x30
| |
| +-> reordered to: test_kernel_wrong_memorder+0x80/0x90
|
| Reported by Kernel Concurrency Sanitizer on:
| CPU: 7 PID: 2310 Comm: access_thread Not tainted 5.14.0-rc1+ #18
| Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
| ==================================================================
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
-rw-r--r-- | kernel/kcsan/report.c | 35 |
1 files changed, 23 insertions, 12 deletions
diff --git a/kernel/kcsan/report.c b/kernel/kcsan/report.c index 1b0e050bdf6a..67794404042a 100644 --- a/kernel/kcsan/report.c +++ b/kernel/kcsan/report.c @@ -308,10 +308,12 @@ static int get_stack_skipnr(const unsigned long stack_entries[], int num_entries /* * Skips to the first entry that matches the function of @ip, and then replaces - * that entry with @ip, returning the entries to skip. + * that entry with @ip, returning the entries to skip with @replaced containing + * the replaced entry. */ static int -replace_stack_entry(unsigned long stack_entries[], int num_entries, unsigned long ip) +replace_stack_entry(unsigned long stack_entries[], int num_entries, unsigned long ip, + unsigned long *replaced) { unsigned long symbolsize, offset; unsigned long target_func; @@ -330,6 +332,7 @@ replace_stack_entry(unsigned long stack_entries[], int num_entries, unsigned lon func -= offset; if (func == target_func) { + *replaced = stack_entries[skip]; stack_entries[skip] = ip; return skip; } @@ -342,9 +345,10 @@ fallback: } static int -sanitize_stack_entries(unsigned long stack_entries[], int num_entries, unsigned long ip) +sanitize_stack_entries(unsigned long stack_entries[], int num_entries, unsigned long ip, + unsigned long *replaced) { - return ip ? replace_stack_entry(stack_entries, num_entries, ip) : + return ip ? replace_stack_entry(stack_entries, num_entries, ip, replaced) : get_stack_skipnr(stack_entries, num_entries); } @@ -360,6 +364,14 @@ static int sym_strcmp(void *addr1, void *addr2) return strncmp(buf1, buf2, sizeof(buf1)); } +static void +print_stack_trace(unsigned long stack_entries[], int num_entries, unsigned long reordered_to) +{ + stack_trace_print(stack_entries, num_entries, 0); + if (reordered_to) + pr_err(" |\n +-> reordered to: %pS\n", (void *)reordered_to); +} + static void print_verbose_info(struct task_struct *task) { if (!task) @@ -378,10 +390,12 @@ static void print_report(enum kcsan_value_change value_change, struct other_info *other_info, u64 old, u64 new, u64 mask) { + unsigned long reordered_to = 0; unsigned long stack_entries[NUM_STACK_ENTRIES] = { 0 }; int num_stack_entries = stack_trace_save(stack_entries, NUM_STACK_ENTRIES, 1); - int skipnr = sanitize_stack_entries(stack_entries, num_stack_entries, ai->ip); + int skipnr = sanitize_stack_entries(stack_entries, num_stack_entries, ai->ip, &reordered_to); unsigned long this_frame = stack_entries[skipnr]; + unsigned long other_reordered_to = 0; unsigned long other_frame = 0; int other_skipnr = 0; /* silence uninit warnings */ @@ -394,7 +408,7 @@ static void print_report(enum kcsan_value_change value_change, if (other_info) { other_skipnr = sanitize_stack_entries(other_info->stack_entries, other_info->num_stack_entries, - other_info->ai.ip); + other_info->ai.ip, &other_reordered_to); other_frame = other_info->stack_entries[other_skipnr]; /* @value_change is only known for the other thread */ @@ -434,10 +448,9 @@ static void print_report(enum kcsan_value_change value_change, other_info->ai.cpu_id); /* Print the other thread's stack trace. */ - stack_trace_print(other_info->stack_entries + other_skipnr, + print_stack_trace(other_info->stack_entries + other_skipnr, other_info->num_stack_entries - other_skipnr, - 0); - + other_reordered_to); if (IS_ENABLED(CONFIG_KCSAN_VERBOSE)) print_verbose_info(other_info->task); @@ -451,9 +464,7 @@ static void print_report(enum kcsan_value_change value_change, get_thread_desc(ai->task_pid), ai->cpu_id); } /* Print stack trace of this thread. */ - stack_trace_print(stack_entries + skipnr, num_stack_entries - skipnr, - 0); - + print_stack_trace(stack_entries + skipnr, num_stack_entries - skipnr, reordered_to); if (IS_ENABLED(CONFIG_KCSAN_VERBOSE)) print_verbose_info(current); |