[AutoPR- Security] Patch gdb for CVE-2026-4647 [MEDIUM] (#16419)

Author: azurelinux-security

SPECS/gdb/CVE-2026-4647.patch

@@ -0,0 +1,225 @@
+From 156144e824f9d79b14f37bfb09757d46540062ab Mon Sep 17 00:00:00 2001
+From: Alan Modra <amodra@gmail.com>
+Date: Fri, 13 Mar 2026 17:28:28 +1030
+Subject: [PATCH] PR33919 Out-of-bounds read in XCOFF relocation processing
+
+	PR 33919
+	* coff-rs6000.c (xcoff_calculate_relocation): Don't use explicit
+	array size.
+	(xcoff_complain_overflow): Likewise.
+	(xcoff_rtype2howto): Return a NULL howto rather than aborting.
+	(_bfd_xcoff_reloc_name_lookup): Use ARRAY_SIZE.
+	(xcoff_ppc_relocate_section): Sanity check reloc r_type before
+	accessing xcoff_howto_table.  Print r_type using %#x.  Remove
+	now redundant later reloc r_type sanity check.
+	* coff64-rs6000.c: Similarly.
+	* libxcoff.h (XCOFF_MAX_CALCULATE_RELOCATION): Don't define.
+	(XCOFF_MAX_COMPLAIN_OVERFLOW): Don't define.
+
+Signed-off-by: Azure Linux Security Servicing Account <azurelinux-security@microsoft.com>
+Upstream-reference: https://sourceware.org/git/?p=binutils-gdb.git;a=patch;h=9e99dbc1f19ffaf18d0250788951706066ebe7f2
+---
+ bfd/coff-rs6000.c   | 36 +++++++++++++++++++++---------------
+ bfd/coff64-rs6000.c | 33 ++++++++++++++++++++-------------
+ bfd/libxcoff.h      |  3 ---
+ 3 files changed, 41 insertions(+), 31 deletions(-)
+
+diff --git a/bfd/coff-rs6000.c b/bfd/coff-rs6000.c
+index bfa999d..593d5d2 100644
+--- a/bfd/coff-rs6000.c
++++ b/bfd/coff-rs6000.c
+@@ -155,8 +155,7 @@ static xcoff_complain_function xcoff_complain_overflow_bitfield_func;
+ static xcoff_complain_function xcoff_complain_overflow_signed_func;
+ static xcoff_complain_function xcoff_complain_overflow_unsigned_func;
+ 
+-xcoff_reloc_function *const
+-xcoff_calculate_relocation[XCOFF_MAX_CALCULATE_RELOCATION] =
++xcoff_reloc_function *const xcoff_calculate_relocation[] =
+ {
+   xcoff_reloc_type_pos,  /* R_POS   (0x00) */
+   xcoff_reloc_type_neg,  /* R_NEG   (0x01) */
+@@ -210,8 +209,7 @@ xcoff_calculate_relocation[XCOFF_MAX_CALCULATE_RELOCATION] =
+   xcoff_reloc_type_toc,  /* R_TOCL    (0x31) */
+ };
+ 
+-xcoff_complain_function *const
+-xcoff_complain_overflow[XCOFF_MAX_COMPLAIN_OVERFLOW] =
++xcoff_complain_function *const xcoff_complain_overflow[] =
+ {
+   xcoff_complain_overflow_dont_func,
+   xcoff_complain_overflow_bitfield_func,
+@@ -1158,8 +1156,11 @@ reloc_howto_type xcoff_howto_table[] =
+ void
+ xcoff_rtype2howto (arelent *relent, struct internal_reloc *internal)
+ {
+-  if (internal->r_type > R_TOCL)
+-    abort ();
++  if (internal->r_type >= ARRAY_SIZE (xcoff_howto_table))
++    {
++      relent->howto = NULL;
++      return;
++    }
+ 
+   /* Default howto layout works most of the time */
+   relent->howto = &xcoff_howto_table[internal->r_type];
+@@ -1183,7 +1184,7 @@ xcoff_rtype2howto (arelent *relent, struct internal_reloc *internal)
+   if (relent->howto->dst_mask != 0
+       && (relent->howto->bitsize
+ 	  != ((unsigned int) internal->r_size & 0x1f) + 1))
+-    abort ();
++    relent->howto = NULL;
+ }
+ 
+ reloc_howto_type *
+@@ -1236,9 +1237,7 @@ _bfd_xcoff_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+ {
+   unsigned int i;
+ 
+-  for (i = 0;
+-       i < sizeof (xcoff_howto_table) / sizeof (xcoff_howto_table[0]);
+-       i++)
++  for (i = 0; i < ARRAY_SIZE (xcoff_howto_table); i++)
+     if (xcoff_howto_table[i].name != NULL
+ 	&& strcasecmp (xcoff_howto_table[i].name, r_name) == 0)
+       return &xcoff_howto_table[i];
+@@ -3681,6 +3680,14 @@ xcoff_ppc_relocate_section (bfd *output_bfd,
+ 	 the csect including the symbol which it references.  */
+       if (rel->r_type == R_REF)
+ 	continue;
++      if (rel->r_type >= ARRAY_SIZE (xcoff_howto_table))
++	{
++	  /* xgettext:c-format */
++	  _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
++			      input_bfd, rel->r_type);
++	  bfd_set_error (bfd_error_bad_value);
++	  return false;
++	}
+ 
+       /* Retrieve default value in HOWTO table and fix up according
+ 	 to r_size field, if it can be different.
+@@ -3700,7 +3707,7 @@ xcoff_ppc_relocate_section (bfd *output_bfd,
+ 
+ 	    default:
+ 	      _bfd_error_handler
+-		(_("%pB: relocation (%d) at 0x%" PRIx64 " has wrong r_rsize (0x%x)\n"),
++		(_("%pB: relocation (%#x) at 0x%" PRIx64 " has wrong r_rsize (0x%x)\n"),
+ 		 input_bfd, rel->r_type, (uint64_t) rel->r_vaddr, rel->r_size);
+ 	      return false;
+ 	    }
+@@ -3776,10 +3783,9 @@ xcoff_ppc_relocate_section (bfd *output_bfd,
+ 	    }
+ 	}
+ 
+-      if (rel->r_type >= XCOFF_MAX_CALCULATE_RELOCATION
+-	  || !((*xcoff_calculate_relocation[rel->r_type])
+-	       (input_bfd, input_section, output_bfd, rel, sym, &howto, val,
+-		addend, &relocation, contents, info)))
++      if (!((*xcoff_calculate_relocation[rel->r_type])
++	    (input_bfd, input_section, output_bfd, rel, sym, &howto, val,
++	     addend, &relocation, contents, info)))
+ 	return false;
+ 
+       /* address */
+diff --git a/bfd/coff64-rs6000.c b/bfd/coff64-rs6000.c
+index fa57910..28baf8a 100644
+--- a/bfd/coff64-rs6000.c
++++ b/bfd/coff64-rs6000.c
+@@ -177,8 +177,7 @@ static bool xcoff64_bad_format_hook
+ /* Relocation functions */
+ static xcoff_reloc_function xcoff64_reloc_type_br;
+ 
+-xcoff_reloc_function *const
+-xcoff64_calculate_relocation[XCOFF_MAX_CALCULATE_RELOCATION] =
++xcoff_reloc_function *const xcoff64_calculate_relocation[] =
+ {
+   xcoff_reloc_type_pos,  /* R_POS     (0x00) */
+   xcoff_reloc_type_neg,  /* R_NEG     (0x01) */
+@@ -1439,8 +1438,11 @@ reloc_howto_type xcoff64_howto_table[] =
+ void
+ xcoff64_rtype2howto (arelent *relent, struct internal_reloc *internal)
+ {
+-  if (internal->r_type > R_TOCL)
+-    abort ();
++  if (internal->r_type >= ARRAY_SIZE (xcoff64_howto_table))
++    {
++      relent->howto = NULL;
++      return;
++    }
+ 
+   /* Default howto layout works most of the time */
+   relent->howto = &xcoff64_howto_table[internal->r_type];
+@@ -1473,7 +1475,7 @@ xcoff64_rtype2howto (arelent *relent, struct internal_reloc *internal)
+   if (relent->howto->dst_mask != 0
+       && (relent->howto->bitsize
+ 	  != ((unsigned int) internal->r_size & 0x3f) + 1))
+-    abort ();
++    relent->howto = NULL;
+ }
+ 
+ reloc_howto_type *
+@@ -1528,9 +1530,7 @@ xcoff64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+ {
+   unsigned int i;
+ 
+-  for (i = 0;
+-       i < sizeof (xcoff64_howto_table) / sizeof (xcoff64_howto_table[0]);
+-       i++)
++  for (i = 0; i < ARRAY_SIZE (xcoff64_howto_table); i++)
+     if (xcoff64_howto_table[i].name != NULL
+ 	&& strcasecmp (xcoff64_howto_table[i].name, r_name) == 0)
+       return &xcoff64_howto_table[i];
+@@ -1574,6 +1574,14 @@ xcoff64_ppc_relocate_section (bfd *output_bfd,
+ 	 the csect including the symbol which it references.  */
+       if (rel->r_type == R_REF)
+ 	continue;
++      if (rel->r_type >= ARRAY_SIZE (xcoff64_howto_table))
++	{
++	  /* xgettext:c-format */
++	  _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
++			      input_bfd, rel->r_type);
++	  bfd_set_error (bfd_error_bad_value);
++	  return false;
++	}
+ 
+       /* Retrieve default value in HOWTO table and fix up according
+ 	 to r_size field, if it can be different.
+@@ -1595,7 +1603,7 @@ xcoff64_ppc_relocate_section (bfd *output_bfd,
+ 
+ 	    default:
+ 	      _bfd_error_handler
+-		(_("%pB: relocation (%d) at (0x%" PRIx64 ") has wrong"
++		(_("%pB: relocation (%#x) at (0x%" PRIx64 ") has wrong"
+ 		   " r_rsize (0x%x)\n"),
+ 		 input_bfd, rel->r_type, rel->r_vaddr, rel->r_size);
+ 	      return false;
+@@ -1668,10 +1676,9 @@ xcoff64_ppc_relocate_section (bfd *output_bfd,
+ 	    }
+ 	}
+ 
+-      if (rel->r_type >= XCOFF_MAX_CALCULATE_RELOCATION
+-	  || !((*xcoff64_calculate_relocation[rel->r_type])
+-	      (input_bfd, input_section, output_bfd, rel, sym, &howto, val,
+-	       addend, &relocation, contents, info)))
++      if (!((*xcoff64_calculate_relocation[rel->r_type])
++	    (input_bfd, input_section, output_bfd, rel, sym, &howto, val,
++	     addend, &relocation, contents, info)))
+ 	return false;
+ 
+       /* address */
+diff --git a/bfd/libxcoff.h b/bfd/libxcoff.h
+index c6ad6dc..01d8ce3 100644
+--- a/bfd/libxcoff.h
++++ b/bfd/libxcoff.h
+@@ -215,9 +215,6 @@ struct xcoff_backend_data_rec
+ #define bfd_xcoff_text_align_power(a) ((xcoff_data (a)->text_align_power))
+ #define bfd_xcoff_data_align_power(a) ((xcoff_data (a)->data_align_power))
+ 
+-/* xcoff*_ppc_relocate_section macros  */
+-#define XCOFF_MAX_CALCULATE_RELOCATION (0x32)
+-#define XCOFF_MAX_COMPLAIN_OVERFLOW (4)
+ /* N_ONES produces N one bits, without overflowing machine arithmetic.  */
+ #ifdef N_ONES
+ #undef N_ONES
+-- 
+2.45.4
+

SPECS/gdb/gdb.spec

@@ -1,7 +1,7 @@
 Summary:        C debugger
 Name:           gdb
 Version:        13.2
-Release:        6%{?dist}
+Release:        7%{?dist}
 License:        GPLv2+
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -13,6 +13,7 @@ Patch1:         CVE-2023-39129.patch
 Patch2:         CVE-2023-39130.patch
 Patch3:         CVE-2025-7546.patch
 Patch4:         CVE-2025-11082.patch
+Patch5:         CVE-2026-4647.patch
 BuildRequires:  expat-devel
 BuildRequires:  gcc-c++
 BuildRequires:  gcc-gfortran
@@ -106,6 +107,9 @@ make check TESTS='gdb.base/default.exp'
 %{_mandir}/*/*
 
 %changelog
+* Thu Apr 02 2026 Azure Linux Security Servicing Account <azurelinux-security@microsoft.com> - 13.2-7
+- Patch for CVE-2026-4647
+
 * Fri Oct 03 2025 Azure Linux Security Servicing Account <azurelinux-security@microsoft.com> - 13.2-6
 - Patch for CVE-2025-11082