glibc/SOURCES/glibc-upstream-2.34-117.patch

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2022-11-15 07:04:49 +00:00
commit 3be79b72d556e3ac37075ad6b99eb5eac18e1402
Author: John David Anglin <danglin@gcc.gnu.org>
Date: Sun Mar 6 15:56:57 2022 +0000
Fix elf/tst-audit2 on hppa
The test elf/tst-audit2 fails on hppa with a segmentation fault in the
long branch stub used to call malloc from calloc. This occurs because
the test is not a PIC executable and calloc is called from the dynamic
linker before the dp register is initialized in _dl_start_user.
The fix is to move the dp register initialization into
elf_machine_runtime_setup. Since the address of $global$ can't be
loaded directly, we continue to use the DT_PLTGOT value from the
the main_map to initialize dp. Since l_main_map is not available
in v2.34 and earlier, we use a new function, elf_machine_main_map,
to find the main map.
diff --git a/sysdeps/hppa/dl-machine.h b/sysdeps/hppa/dl-machine.h
index f048fd20728ccde6..24f0f47d8f1e25cd 100644
--- a/sysdeps/hppa/dl-machine.h
+++ b/sysdeps/hppa/dl-machine.h
@@ -27,6 +27,7 @@
#include <string.h>
#include <link.h>
#include <errno.h>
+#include <ldsodefs.h>
#include <dl-fptr.h>
#include <abort-instr.h>
#include <tls.h>
@@ -159,6 +160,24 @@ elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
return (struct fdesc) { value.ip + reloc->r_addend, value.gp };
}
+static inline struct link_map *
+elf_machine_main_map (void)
+{
+ struct link_map *main_map;
+
+#if defined SHARED && IS_IN (rtld)
+ asm (
+" bl 1f,%0\n"
+" addil L'_rtld_local - ($PIC_pcrel$0 - 1),%0\n"
+"1: ldw R'_rtld_local - ($PIC_pcrel$0 - 5)(%%r1),%0\n"
+ : "=r" (main_map) : : "r1");
+#else
+ main_map = NULL;
+#endif
+
+ return main_map;
+}
+
/* Set up the loaded object described by L so its unrelocated PLT
entries will jump to the on-demand fixup code in dl-runtime.c. */
@@ -174,6 +193,15 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
Elf32_Addr i[2];
} sig = {{0x00,0xc0,0xff,0xee, 0xde,0xad,0xbe,0xef}};
+ /* Initialize dp register for main executable. */
+ if (l == elf_machine_main_map ())
+ {
+ register Elf32_Addr dp asm ("%r27");
+
+ dp = D_PTR (l, l_info[DT_PLTGOT]);
+ asm volatile ("" : : "r" (dp));
+ }
+
/* If we don't have a PLT we can just skip all this... */
if (__builtin_expect (l->l_info[DT_JMPREL] == NULL,0))
return lazy;
@@ -336,16 +364,6 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
its return value is the user program's entry point. */
#define RTLD_START \
-/* Set up dp for any non-PIC lib constructors that may be called. */ \
-static struct link_map * __attribute__((used)) \
-set_dp (struct link_map *map) \
-{ \
- register Elf32_Addr dp asm ("%r27"); \
- dp = D_PTR (map, l_info[DT_PLTGOT]); \
- asm volatile ("" : : "r" (dp)); \
- return map; \
-} \
- \
asm ( \
" .text\n" \
" .globl _start\n" \
@@ -445,14 +463,11 @@ asm ( \
" stw %r24,-44(%sp)\n" \
\
".Lnofix:\n" \
+ /* Call _dl_init(main_map, argc, argv, envp). */ \
" addil LT'_rtld_local,%r19\n" \
" ldw RT'_rtld_local(%r1),%r26\n" \
-" bl set_dp, %r2\n" \
" ldw 0(%r26),%r26\n" \
\
- /* Call _dl_init(_dl_loaded, argc, argv, envp). */ \
-" copy %r28,%r26\n" \
- \
/* envp = argv + argc + 1 */ \
" sh2add %r25,%r24,%r23\n" \
" bl _dl_init,%r2\n" \