From f458d48562b51f4b0b136a52825e11e2e64eedf5 Mon Sep 17 00:00:00 2001
From: Packit Service <user-cont-team+packit-service@redhat.com>
Date: Feb 03 2021 06:33:45 +0000
Subject: Apply patch glibc-rh1726638-2.patch


patch_name: glibc-rh1726638-2.patch
present_in_specfile: true
location_in_specfile: 216

---

diff --git a/sysdeps/aarch64/dl-dtprocnum.h b/sysdeps/aarch64/dl-dtprocnum.h
new file mode 100644
index 0000000..4ac2adf
--- /dev/null
+++ b/sysdeps/aarch64/dl-dtprocnum.h
@@ -0,0 +1,21 @@
+/* Configuration of lookup functions.  AArch64 version.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Number of extra dynamic section entries for this architecture.  By
+   default there are none.  */
+#define DT_THISPROCNUM	DT_AARCH64_NUM
diff --git a/sysdeps/aarch64/dl-machine.h b/sysdeps/aarch64/dl-machine.h
index 4935aa7..d449485 100644
--- a/sysdeps/aarch64/dl-machine.h
+++ b/sysdeps/aarch64/dl-machine.h
@@ -27,6 +27,9 @@
 #include <dl-irel.h>
 #include <cpu-features.c>
 
+/* Translate a processor specific dynamic tag to the index in l_info array.  */
+#define DT_AARCH64(x) (DT_AARCH64_##x - DT_LOPROC + DT_NUM)
+
 /* Return nonzero iff ELF header is compatible with the running host.  */
 static inline int __attribute__ ((unused))
 elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
@@ -102,6 +105,10 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
 	}
     }
 
+  /* Check if STO_AARCH64_VARIANT_PCS needs to be handled.  */
+  if (l->l_info[DT_AARCH64 (VARIANT_PCS)])
+    l->l_mach.variant_pcs = 1;
+
   return lazy;
 }
 
@@ -388,10 +395,37 @@ elf_machine_lazy_rel (struct link_map *map,
   /* Check for unexpected PLT reloc type.  */
   if (__builtin_expect (r_type == AARCH64_R(JUMP_SLOT), 1))
     {
-      if (__builtin_expect (map->l_mach.plt, 0) == 0)
-	*reloc_addr += l_addr;
-      else
-	*reloc_addr = map->l_mach.plt;
+      if (map->l_mach.plt == 0)
+	{
+	  /* Prelinking.  */
+	  *reloc_addr += l_addr;
+	  return;
+	}
+
+      if (__glibc_unlikely (map->l_mach.variant_pcs))
+	{
+	  /* Check the symbol table for variant PCS symbols.  */
+	  const Elf_Symndx symndx = ELFW (R_SYM) (reloc->r_info);
+	  const ElfW (Sym) *symtab =
+	    (const void *)D_PTR (map, l_info[DT_SYMTAB]);
+	  const ElfW (Sym) *sym = &symtab[symndx];
+	  if (__glibc_unlikely (sym->st_other & STO_AARCH64_VARIANT_PCS))
+	    {
+	      /* Avoid lazy resolution of variant PCS symbols.  */
+	      const struct r_found_version *version = NULL;
+	      if (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL)
+		{
+		  const ElfW (Half) *vernum =
+		    (const void *)D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]);
+		  version = &map->l_versions[vernum[symndx] & 0x7fff];
+		}
+	      elf_machine_rela (map, reloc, sym, version, reloc_addr,
+				skip_ifunc);
+	      return;
+	    }
+	}
+
+      *reloc_addr = map->l_mach.plt;
     }
   else if (__builtin_expect (r_type == AARCH64_R(TLSDESC), 1))
     {
diff --git a/sysdeps/aarch64/linkmap.h b/sysdeps/aarch64/linkmap.h
index 6852f34..dd85974 100644
--- a/sysdeps/aarch64/linkmap.h
+++ b/sysdeps/aarch64/linkmap.h
@@ -20,4 +20,5 @@ struct link_map_machine
 {
   ElfW(Addr) plt;	  /* Address of .plt */
   void *tlsdesc_table;	  /* Address of TLS descriptor hash table.  */
+  int variant_pcs;	  /* If set, PLT calls may follow a variant PCS.  */
 };