Since commit ad67b74d2469 ("printk: hash addresses printed with %p"), all pointers printed with %p are printed with hashed addresses instead of real addresses in order to avoid leaking addresses in dmesg and syslog. But this applies to kdb too, with is unfortunate: Entering kdb (current=0x(ptrval), pid 329) due to Keyboard Entry kdb> ps 15 sleeping system daemon (state M) processes suppressed, use 'ps A' to see all. Task Addr Pid Parent [*] cpu State Thread Command 0x(ptrval) 329 328 1 0 R 0x(ptrval) *sh 0x(ptrval) 1 0 0 0 S 0x(ptrval) init 0x(ptrval) 3 2 0 0 D 0x(ptrval) rcu_gp 0x(ptrval) 4 2 0 0 D 0x(ptrval) rcu_par_gp 0x(ptrval) 5 2 0 0 D 0x(ptrval) kworker/0:0 0x(ptrval) 6 2 0 0 D 0x(ptrval) kworker/0:0H 0x(ptrval) 7 2 0 0 D 0x(ptrval) kworker/u2:0 0x(ptrval) 8 2 0 0 D 0x(ptrval) mm_percpu_wq 0x(ptrval) 10 2 0 0 D 0x(ptrval) rcu_preempt The whole purpose of kdb is to debug, and for debugging real addresses need to be known. In addition, data displayed by kdb doesn't go into dmesg. This patch replaces all %p by %px in kdb in order to display real addresses.
Showing the changes to kernel/debug/kdb/kdb_support.c (1 of 2 files). Show all
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| @@ -40,7 +40,7 @@ · 39 unmodified lines | |||
| 40 | int kdbgetsymval(const char *symname, kdb_symtab_t *symtab) | 40 | int kdbgetsymval(const char *symname, kdb_symtab_t *symtab) |
| 41 | { | 41 | { |
| 42 | if (KDB_DEBUG(AR)) | 42 | if (KDB_DEBUG(AR)) |
| 43 | kdb_printf("kdbgetsymval: symname=%s, symtab=%p\n", symname, | 43 | kdb_printf("kdbgetsymval: symname=%s, symtab=%px\n", symname, |
| 44 | symtab); | 44 | symtab); |
| 45 | memset(symtab, 0, sizeof(*symtab)); | 45 | memset(symtab, 0, sizeof(*symtab)); |
| 46 | symtab->sym_start = kallsyms_lookup_name(symname); | 46 | symtab->sym_start = kallsyms_lookup_name(symname); |
| @@ -88,7 +88,7 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab) · 41 unmodified lines | |||
| 88 | char *knt1 = NULL; | 88 | char *knt1 = NULL; |
| 89 | 89 | ||
| 90 | if (KDB_DEBUG(AR)) | 90 | if (KDB_DEBUG(AR)) |
| 91 | kdb_printf("kdbnearsym: addr=0x%lx, symtab=%p\n", addr, symtab); | 91 | kdb_printf("kdbnearsym: addr=0x%lx, symtab=%px\n", addr, symtab); |
| 92 | memset(symtab, 0, sizeof(*symtab)); | 92 | memset(symtab, 0, sizeof(*symtab)); |
| 93 | 93 | ||
| 94 | if (addr < 4096) | 94 | if (addr < 4096) |
| @@ -149,7 +149,7 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab) · 54 unmodified lines | |||
| 149 | symtab->mod_name = "kernel"; | 149 | symtab->mod_name = "kernel"; |
| 150 | if (KDB_DEBUG(AR)) | 150 | if (KDB_DEBUG(AR)) |
| 151 | kdb_printf("kdbnearsym: returns %d symtab->sym_start=0x%lx, " | 151 | kdb_printf("kdbnearsym: returns %d symtab->sym_start=0x%lx, " |
| 152 | "symtab->mod_name=%p, symtab->sym_name=%p (%s)\n", ret, | 152 | "symtab->mod_name=%px, symtab->sym_name=%px (%s)\n", ret, |
| 153 | symtab->sym_start, symtab->mod_name, symtab->sym_name, | 153 | symtab->sym_start, symtab->mod_name, symtab->sym_name, |
| 154 | symtab->sym_name); | 154 | symtab->sym_name); |
| 155 | 155 | ||
| @@ -887,13 +887,13 @@ void debug_kusage(void) · 731 unmodified lines | |||
| 887 | __func__, dah_first); | 887 | __func__, dah_first); |
| 888 | if (dah_first) { | 888 | if (dah_first) { |
| 889 | h_used = (struct debug_alloc_header *)debug_alloc_pool; | 889 | h_used = (struct debug_alloc_header *)debug_alloc_pool; |
| 890 | kdb_printf("%s: h_used %p size %d\n", __func__, h_used, | 890 | kdb_printf("%s: h_used %px size %d\n", __func__, h_used, |
| 891 | h_used->size); | 891 | h_used->size); |
| 892 | } | 892 | } |
| 893 | do { | 893 | do { |
| 894 | h_used = (struct debug_alloc_header *) | 894 | h_used = (struct debug_alloc_header *) |
| 895 | ((char *)h_free + dah_overhead + h_free->size); | 895 | ((char *)h_free + dah_overhead + h_free->size); |
| 896 | kdb_printf("%s: h_used %p size %d caller %p\n", | 896 | kdb_printf("%s: h_used %px size %d caller %px\n", |
| 897 | __func__, h_used, h_used->size, h_used->caller); | 897 | __func__, h_used, h_used->size, h_used->caller); |
| 898 | h_free = (struct debug_alloc_header *) | 898 | h_free = (struct debug_alloc_header *) |
| 899 | (debug_alloc_pool + h_free->next); | 899 | (debug_alloc_pool + h_free->next); |
| @@ -902,7 +902,7 @@ void debug_kusage(void) · 2 unmodified lines | |||
| 902 | ((char *)h_free + dah_overhead + h_free->size); | 902 | ((char *)h_free + dah_overhead + h_free->size); |
| 903 | if ((char *)h_used - debug_alloc_pool != | 903 | if ((char *)h_used - debug_alloc_pool != |
| 904 | sizeof(debug_alloc_pool_aligned)) | 904 | sizeof(debug_alloc_pool_aligned)) |
| 905 | kdb_printf("%s: h_used %p size %d caller %p\n", | 905 | kdb_printf("%s: h_used %px size %d caller %px\n", |
| 906 | __func__, h_used, h_used->size, h_used->caller); | 906 | __func__, h_used, h_used->size, h_used->caller); |
| 907 | out: | 907 | out: |
| 908 | spin_unlock(&dap_lock); | 908 | spin_unlock(&dap_lock); |