fix realpath when stdlib.h is included before limits.h
If program includes stdlib.h before limits.h without _XOPEN_SOURCE, _GNU_SOURCE or _BSD_SOURCE explicitly set, then will it always trigger the trap with musl libc. This is becase stdlib.h will pull in features.h which will set _GNU_SOURCE. This means that the fortify stdlib.h will not include limits.h but it will still trigger the fortified realpath(), but without PATH_MAX set. We fix this by including system stdlib.h before testing if limits.h should be included. Since PATH_MAX is known at compile time we can also error at compile time, instead of compiling a broken realpath().
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@ -1,12 +1,12 @@
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#ifndef _FORTIFY_STDLIB_H
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#define _FORTIFY_STDLIB_H
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#include_next <stdlib.h>
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#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
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#include_next <limits.h>
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#endif
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#include_next <stdlib.h>
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#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
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#ifdef __cplusplus
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@ -23,7 +23,7 @@ char *realpath(const char *path, char *resolved)
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if (resolved) {
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#ifndef PATH_MAX
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__builtin_trap();
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# error PATH_MAX unset. A fortified realpath will not work.
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#else
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bos = __builtin_object_size(resolved, 0);
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if (PATH_MAX > bos)
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