lib/test_printf.c: accept "ptrval" as valid result for plain 'p' tests
If the test_printf module is loaded before the crng is initialized, the
plain 'p' tests will fail because the printed address will not be hashed
and the buffer will contain "(____ptrval____)" or "(ptrval)" instead
(64-bit vs 32-bit).
Since we cannot wait for the crng to be initialized for an undefined
time, both plain 'p' tests now accept the strings "(____ptrval____)" or
"(ptrval)" as a valid result and print a warning message.
Link: http://lkml.kernel.org/r/20180613171840.29827-1-thierry.escande@linaro.org
Fixes: ad67b74d24
("printk: hash addresses printed with %p")
To: Andrew Morton <akpm@linux-foundation.org>
To: David Miller <davem@davemloft.net>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: "Tobin C . Harding" <me@tobin.cc>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Thierry Escande <thierry.escande@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
parent
d75ae5bdf2
commit
ce041c43f2
1 changed files with 22 additions and 2 deletions
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@ -206,6 +206,7 @@ test_string(void)
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#define PTR_WIDTH 16
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#define PTR ((void *)0xffff0123456789abUL)
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#define PTR_STR "ffff0123456789ab"
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#define PTR_VAL_NO_CRNG "(____ptrval____)"
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#define ZEROS "00000000" /* hex 32 zero bits */
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static int __init
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@ -216,7 +217,16 @@ plain_format(void)
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nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
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if (nchars != PTR_WIDTH || strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
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if (nchars != PTR_WIDTH)
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return -1;
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if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
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pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
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PTR_VAL_NO_CRNG);
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return 0;
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}
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if (strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
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return -1;
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return 0;
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@ -227,6 +237,7 @@ plain_format(void)
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#define PTR_WIDTH 8
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#define PTR ((void *)0x456789ab)
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#define PTR_STR "456789ab"
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#define PTR_VAL_NO_CRNG "(ptrval)"
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static int __init
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plain_format(void)
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@ -245,7 +256,16 @@ plain_hash(void)
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nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
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if (nchars != PTR_WIDTH || strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
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if (nchars != PTR_WIDTH)
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return -1;
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if (strncmp(buf, PTR_VAL_NO_CRNG, PTR_WIDTH) == 0) {
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pr_warn("crng possibly not yet initialized. plain 'p' buffer contains \"%s\"",
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PTR_VAL_NO_CRNG);
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return 0;
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}
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if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
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return -1;
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return 0;
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