[glibc] unistd: Avoid PLT entries with _FORTIFY_SOURCE

[glibc] unistd: Avoid PLT entries with _FORTIFY_SOURCE

[Frederic Berat]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b17d65ff927241d2bc36cbfe258431bec2ffad1b

commit b17d65ff927241d2bc36cbfe258431bec2ffad1b
Author: Frédéric Bérat <fberat@redhat.com>
Date:   Wed Jun 7 11:34:36 2023 +0200

    unistd: Avoid PLT entries with _FORTIFY_SOURCE
    
    The change is meant to avoid unwanted PLT entries for the read_chk,
    getdomainname_chk and getlogin_r_chk routines when _FORTIFY_SOURCE is set.
    
    Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

Diff:
---
 debug/getdomainname_chk.c | 1 +
 debug/read_chk.c          | 1 +
 include/unistd.h          | 4 ++++
 login/getlogin_r_chk.c    | 1 +
 posix/bits/unistd-decl.h  | 6 +++---
 5 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/debug/getdomainname_chk.c b/debug/getdomainname_chk.c
index ccea1b2d9e..a7492adf95 100644
--- a/debug/getdomainname_chk.c
+++ b/debug/getdomainname_chk.c
@@ -26,3 +26,4 @@ __getdomainname_chk (char *buf, size_t buflen, size_t nreal)
 
   return getdomainname (buf, buflen);
 }
+libc_hidden_def (__getdomainname_chk)
diff --git a/debug/read_chk.c b/debug/read_chk.c
index 17588736a1..75d902a8ba 100644
--- a/debug/read_chk.c
+++ b/debug/read_chk.c
@@ -25,3 +25,4 @@ __read_chk (int fd, void *buf, size_t nbytes, size_t buflen)
 
   return __read (fd, buf, nbytes);
 }
+libc_hidden_def (__read_chk)
diff --git a/include/unistd.h b/include/unistd.h
index b042a485f9..e241603b81 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -32,6 +32,10 @@ libc_hidden_proto (readlinkat)
 libc_hidden_proto (fsync)
 libc_hidden_proto (fdatasync)
 
+libc_hidden_proto (__read_chk)
+libc_hidden_proto (__getdomainname_chk)
+libc_hidden_proto (__getlogin_r_chk)
+
 /* Now define the internal interfaces.  */
 extern int __access (const char *__name, int __type);
 libc_hidden_proto (__access)
diff --git a/login/getlogin_r_chk.c b/login/getlogin_r_chk.c
index 12a0d12bd4..26ec3e6970 100644
--- a/login/getlogin_r_chk.c
+++ b/login/getlogin_r_chk.c
@@ -26,3 +26,4 @@ __getlogin_r_chk (char *buf, size_t buflen, size_t nreal)
 
   return getlogin_r (buf, buflen);
 }
+libc_hidden_def (__getlogin_r_chk)
diff --git a/posix/bits/unistd-decl.h b/posix/bits/unistd-decl.h
index 2d0f7a4456..2603039767 100644
--- a/posix/bits/unistd-decl.h
+++ b/posix/bits/unistd-decl.h
@@ -26,7 +26,7 @@
 extern ssize_t __read_chk (int __fd, void *__buf, size_t __nbytes,
 			   size_t __buflen)
      __wur __attr_access ((__write_only__, 2, 3));
-extern ssize_t __REDIRECT (__read_alias, (int __fd, void *__buf,
+extern ssize_t __REDIRECT_FORTIFY (__read_alias, (int __fd, void *__buf,
 						  size_t __nbytes), read)
      __wur __attr_access ((__write_only__, 2, 3));
 extern ssize_t __REDIRECT (__read_chk_warn,
@@ -157,7 +157,7 @@ extern int __REDIRECT_NTH (__ttyname_r_chk_warn,
 #ifdef __USE_POSIX199506
 extern int __getlogin_r_chk (char *__buf, size_t __buflen, size_t __nreal)
      __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
-extern int __REDIRECT (__getlogin_r_alias, (char *__buf, size_t __buflen),
+extern int __REDIRECT_FORTIFY (__getlogin_r_alias, (char *__buf, size_t __buflen),
 		       getlogin_r) __nonnull ((1));
 extern int __REDIRECT (__getlogin_r_chk_warn,
 		       (char *__buf, size_t __buflen, size_t __nreal),
@@ -184,7 +184,7 @@ extern int __REDIRECT_NTH (__gethostname_chk_warn,
 #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_UNIX98)
 extern int __getdomainname_chk (char *__buf, size_t __buflen, size_t __nreal)
      __THROW __nonnull ((1)) __wur __attr_access ((__write_only__, 1, 2));
-extern int __REDIRECT_NTH (__getdomainname_alias, (char *__buf,
+extern int __REDIRECT_FORTIFY_NTH (__getdomainname_alias, (char *__buf,
 						   size_t __buflen),
 			   getdomainname) __nonnull ((1))
      __wur __attr_access ((__write_only__, 1, 2));