Patch "selftests: vDSO: fix ELF hash table entry size for s390x" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    selftests: vDSO: fix ELF hash table entry size for s390x

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     selftests-vdso-fix-elf-hash-table-entry-size-for-s39.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 6aefdfbbfc231cda9dd43bbc770af702cc747e55
Author: Jens Remus <jremus@xxxxxxxxxxxxx>
Date:   Wed Sep 11 10:50:14 2024 +0200

    selftests: vDSO: fix ELF hash table entry size for s390x
    
    [ Upstream commit 14be4e6f35221c4731b004553ecf7cbc6dc1d2d8 ]
    
    The vDSO self tests fail on s390x for a vDSO linked with the GNU linker
    ld as follows:
    
      # ./vdso_test_gettimeofday
      Floating point exception (core dumped)
    
    On s390x the ELF hash table entries are 64 bits instead of 32 bits in
    size (see Glibc sysdeps/unix/sysv/linux/s390/bits/elfclass.h).
    
    Fixes: 40723419f407 ("kselftest: Enable vDSO test on non x86 platforms")
    Reported-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
    Tested-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
    Signed-off-by: Jens Remus <jremus@xxxxxxxxxxxxx>
    Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
    Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c
index d9ccc5acac182..7dd5668ea8a6e 100644
--- a/tools/testing/selftests/vDSO/parse_vdso.c
+++ b/tools/testing/selftests/vDSO/parse_vdso.c
@@ -36,6 +36,12 @@
 #define ELF_BITS_XFORM(bits, x) ELF_BITS_XFORM2(bits, x)
 #define ELF(x) ELF_BITS_XFORM(ELF_BITS, x)
 
+#ifdef __s390x__
+#define ELF_HASH_ENTRY ELF(Xword)
+#else
+#define ELF_HASH_ENTRY ELF(Word)
+#endif
+
 static struct vdso_info
 {
 	bool valid;
@@ -47,8 +53,8 @@ static struct vdso_info
 	/* Symbol table */
 	ELF(Sym) *symtab;
 	const char *symstrings;
-	ELF(Word) *bucket, *chain;
-	ELF(Word) nbucket, nchain;
+	ELF_HASH_ENTRY *bucket, *chain;
+	ELF_HASH_ENTRY nbucket, nchain;
 
 	/* Version table */
 	ELF(Versym) *versym;
@@ -115,7 +121,7 @@ void vdso_init_from_sysinfo_ehdr(uintptr_t base)
 	/*
 	 * Fish out the useful bits of the dynamic table.
 	 */
-	ELF(Word) *hash = 0;
+	ELF_HASH_ENTRY *hash = 0;
 	vdso_info.symstrings = 0;
 	vdso_info.symtab = 0;
 	vdso_info.versym = 0;
@@ -133,7 +139,7 @@ void vdso_init_from_sysinfo_ehdr(uintptr_t base)
 				 + vdso_info.load_offset);
 			break;
 		case DT_HASH:
-			hash = (ELF(Word) *)
+			hash = (ELF_HASH_ENTRY *)
 				((uintptr_t)dyn[i].d_un.d_ptr
 				 + vdso_info.load_offset);
 			break;