Dump stack if memwipe() check fails
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0f499f41dc
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1657b4ef26
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@ -150,13 +150,23 @@ static bool equals(char *a, char *b)
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return streq(a, b);
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}
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/**
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* Number of words we write and memwipe() in memwipe check
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*/
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#define MEMWIPE_WIPE_WORDS 16
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/**
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* Number of words we check stack for memwiped magic
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*/
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#define MEMWIPE_CHECK_WORDS (MEMWIPE_WIPE_WORDS * 2)
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/**
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* Write magic to memory, and try to clear it with memwipe()
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*/
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__attribute__((noinline))
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static void do_magic(int magic, int **stack)
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{
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int buf[32], i;
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int buf[MEMWIPE_WIPE_WORDS], i;
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/* tell caller where callee stack is (but don't point to buf) */
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*stack = &i;
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@ -184,11 +194,18 @@ static bool check_memwipe()
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{ /* stack grows down */
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stackdir = -1;
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}
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for (i = 0; i < 128; i++)
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for (i = 0; i < MEMWIPE_CHECK_WORDS; i++)
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{
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ptr = ptr + stackdir;
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if (*ptr == magic)
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{
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ptr = &magic + stackdir;
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if (stackdir == -1)
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{
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ptr -= MEMWIPE_CHECK_WORDS;
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}
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DBG1(DBG_LIB, "memwipe() check failed: stackdir: %d %b",
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stackdir, ptr, (u_int)(MEMWIPE_CHECK_WORDS * sizeof(int)));
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return FALSE;
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}
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}
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@ -268,7 +285,6 @@ bool library_init(char *settings)
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if (!check_memwipe())
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{
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DBG1(DBG_LIB, "memwipe() check failed");
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return FALSE;
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}
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