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posix: Revert the removal of the crypt prototype from <unistd.h>

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Many applications still rely on this prototype.  Rebuilds without
this prototype result in an implicit function declaration, which can
introduce security vulnerabilities due to 32-bit pointer truncation.
This commit is contained in:
Florian Weimer 2023-11-22 08:38:33 +01:00
parent 780c339202
commit 5d7f1bce7d
2 changed files with 17 additions and 1 deletions
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5
NEWS
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@ -52,7 +52,10 @@ Deprecated and removed features, and other changes affecting compatibility:
* libcrypt has been removed from the GNU C Library. The configure
options "--enable-crypt" and "--enable-nss-crypt" are no longer
available. <crypt.h>, libcrypt.a, and libcrypt.so.1 will not be
installed, and <unistd.h> will not declare the crypt function.
installed. For now <unistd.h> continues to declare the crypt
function by default, to avoid introducing vulnerabilities into
existing applications due to a missing prototype. This declaration
is deprecated and may be removed in a future glibc release.
The replacement for libcrypt is libxcrypt, maintained separately from
GNU libc, but available under compatible licensing terms, and providing

13
posix/unistd.h
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@ -1150,6 +1150,19 @@ ssize_t copy_file_range (int __infd, __off64_t *__pinoff,
extern int fdatasync (int __fildes);
#endif /* Use POSIX199309 */
#ifdef __USE_MISC
/* One-way hash PHRASE, returning a string suitable for storage in the
user database. SALT selects the one-way function to use, and
ensures that no two users' hashes are the same, even if they use
the same passphrase. The return value points to static storage
which will be overwritten by the next call to crypt.
This declaration is deprecated; applications should include
<crypt.h> instead. */
extern char *crypt (const char *__key, const char *__salt)
__THROW __nonnull ((1, 2));
#endif
#ifdef __USE_XOPEN
/* Swab pairs bytes in the first N bytes of the area pointed to by
FROM and copy the result to TO. The value of TO must not be in the