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Subject[PATCH] Fix kallsyms stem compression crash
[please cc, i'm not on the list]

the attached patch fixes the crash top or cat /proc/*/wchan produces when using KALLSYMS
it's a buffer overrun that should not happen. maybe 128 chars is just too small...i'm going to check that...
based on patch by andi kleen.
against 2.5.54. please apply.


beep
-daniel


--- 2554-clean/kernel/kallsyms.c 2003-01-02 04:23:14.000000000 +0100
+++ 2554/kernel/kallsyms.c 2003-01-02 18:51:39.000000000 +0100
@@ -32,6 +32,7 @@
BUG();

namebuf[127] = 0;
+ namebuf[0] = 0;

if (addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) {
unsigned long symbol_end;
@@ -46,10 +47,10 @@

/* Grab name */
for (i = 0; i < best; i++) {
- ++name;
- strncpy(namebuf + name[-1], name, 127);
- name += strlen(name)+1;
- }
+ unsigned prefix = *name++;
+ strncpy(namebuf + prefix, name, 127 - prefix);
+ name += strlen(name) + 1;
+ }

/* Base symbol size on next symbol. */
if (best + 1 < kallsyms_num_syms)
--- linux-vanilla/scripts/kallsyms.c 2003-01-02 06:55:56.000000000 +0100
+++ linux/scripts/kallsyms.c 2003-01-02 11:02:18.000000000 +0100
@@ -144,7 +144,7 @@
for (k = 0; table[i].sym[k] && table[i].sym[k] == prev[k]; ++k)
;

- printf("\t.asciz\t\"\\x%02x%s\"\n", k, table[i].sym + k);
+ printf("\t.byte 0x%02x ; .asciz\t\"%s\"\n", k, table[i].sym + k);
last_addr = table[i].addr;
prev = table[i].sym;
}


-
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