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Modify the add_seeds_stringlist() macro to fix a preprocessor error

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When OpenSSL is configured using `--with-rand-seed=devrandom`, the preprocessor
reports the following error

    crypto/info.c:104:66: error:
            macro "add_seeds_stringlist" passed 3 arguments, but takes just 2
            add_seeds_stringlist("random-device", { DEVRANDOM, NULL });

The reason why the preprocessor complains about three arguments being passed
is that according to [1], balanced braces in macro arguments don't prevent the
comma from acting as an argument separator:

    3.3 Macro Arguments
    ...
    Parentheses within each argument must balance;
    a comma within such parentheses does not end the argument.
    However, there is no requirement for square brackets or braces to balance,
    and they do not prevent a comma from separating arguments.

Also introduced an iteration pointer `p`, because `dev` is not an lvalue:

    crypto/info.c:78:41: error:
            lvalue required as increment operand
            for (; *dev != NULL; dev++) {

[1] https://gcc.gnu.org/onlinedocs/cpp/Macro-Arguments.html

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/10762)
This commit is contained in:
Dr. Matthias St. Pierre 2020-01-06 02:38:14 +01:00
parent 2e912f63a4
commit 9484b67dfb
1 changed files with 6 additions and 5 deletions
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11
crypto/info.c
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@ -72,14 +72,15 @@ DEFINE_RUN_ONCE_STATIC(init_info_strings)
do { \
add_seeds_string(label "("); \
{ \
const char *dev[] = strlist; \
const char *dev[] = { strlist, NULL }; \
const char **p; \
int first = 1; \
\
for (; *dev != NULL; dev++) { \
for (p = dev; *p != NULL; p++) { \
if (!first) \
OPENSSL_strlcat(seeds, " ", sizeof(seeds)); \
first = 0; \
OPENSSL_strlcat(seeds, *dev, sizeof(seeds)); \
OPENSSL_strlcat(seeds, *p, sizeof(seeds)); \
} \
} \
OPENSSL_strlcat(seeds, ")", sizeof(seeds)); \
@ -101,10 +102,10 @@ DEFINE_RUN_ONCE_STATIC(init_info_strings)
add_seeds_string("getrandom-syscall");
#endif
#ifdef OPENSSL_RAND_SEED_DEVRANDOM
add_seeds_stringlist("random-device", { DEVRANDOM, NULL });
add_seeds_stringlist("random-device", DEVRANDOM);
#endif
#ifdef OPENSSL_RAND_SEED_EGD
add_seeds_stringlist("EGD", { DEVRANDOM_EGD, NULL });
add_seeds_stringlist("EGD", DEVRANDOM_EGD);
#endif
#ifdef OPENSSL_RAND_SEED_OS
add_seeds_string("os-specific");