From aa7bca9b2e30cf128966631382731369f7b753d8 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Fri, 24 Aug 2018 04:37:45 -0700 Subject: [PATCH] x86: Add GNU_PROPERTY_X86_UINT32_VALID The older linker treats .note.gnu.property section as a generic note and just concatenates all .note.gnu.property sections from the input to the output. On CET-enabled OS, the output of the older linker is marked as CET enabled, but in fact, it is not CET enabled and it crashes on CET-enabled machines. This patch defines GNU_PROPERTY_X86_UINT32_VALID. Linker is updated to set the GNU_PROPERTY_X86_UINT32_VALID bit in GNU property note for non-relocatable output to differentiate outputs from the older linker. bfd/ * elfxx-x86.c (_bfd_x86_elf_parse_gnu_properties): Mask out the GNU_PROPERTY_X86_UINT32_VALID bit. (_bfd_x86_elf_link_fixup_gnu_properties): Set the GNU_PROPERTY_X86_UINT32_VALID bit for non-relocatable output. binutils/ * readelf.c (print_gnu_property_note): Check the GNU_PROPERTY_X86_UINT32_VALID bit for invalid GNU property note. include/ * elf/common.h (GNU_PROPERTY_X86_UINT32_VALID): New. --- bfd/ChangeLog | 7 +++++++ bfd/elfxx-x86.c | 17 ++++++++++++----- binutils/ChangeLog | 5 +++++ binutils/readelf.c | 44 +++++++++++++++++++++++++++++++++++--------- include/ChangeLog | 4 ++++ include/elf/common.h | 3 +++ 6 files changed, 66 insertions(+), 14 deletions(-) diff --git a/bfd/ChangeLog b/bfd/ChangeLog index 1cadfc4b7f..44690b831f 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,10 @@ +2018-08-24 H.J. Lu + + * elfxx-x86.c (_bfd_x86_elf_parse_gnu_properties): Mask out the + GNU_PROPERTY_X86_UINT32_VALID bit. + (_bfd_x86_elf_link_fixup_gnu_properties): Set the + GNU_PROPERTY_X86_UINT32_VALID bit for non-relocatable output. + 2018-08-23 Zenith423 PR 23460 diff --git a/bfd/elfxx-x86.c b/bfd/elfxx-x86.c index 1a4c723969..0d91e4dfc9 100644 --- a/bfd/elfxx-x86.c +++ b/bfd/elfxx-x86.c @@ -2378,8 +2378,10 @@ _bfd_x86_elf_parse_gnu_properties (bfd *abfd, unsigned int type, return property_corrupt; } prop = _bfd_elf_get_property (abfd, type, datasz); - /* Combine properties of the same type. */ - prop->u.number |= bfd_h_get_32 (abfd, ptr); + /* Mask out GNU_PROPERTY_X86_UINT32_VALID and combine properties + of the same type. */ + prop->u.number |= (bfd_h_get_32 (abfd, ptr) + & ~GNU_PROPERTY_X86_UINT32_VALID); prop->pr_kind = property_number; break; @@ -2963,9 +2965,8 @@ error_alignment: /* Fix up x86 GNU properties. */ void -_bfd_x86_elf_link_fixup_gnu_properties - (struct bfd_link_info *info ATTRIBUTE_UNUSED, - elf_property_list **listp) +_bfd_x86_elf_link_fixup_gnu_properties (struct bfd_link_info *info, + elf_property_list **listp) { elf_property_list *p; @@ -2981,6 +2982,12 @@ _bfd_x86_elf_link_fixup_gnu_properties *listp = p->next; continue; } + + /* Mark x86-specific properties with X86_UINT32_VALID for + non-relocatable output. */ + if (!(bfd_link_relocatable (info))) + p->property.u.number |= GNU_PROPERTY_X86_UINT32_VALID; + listp = &p->next; break; default: diff --git a/binutils/ChangeLog b/binutils/ChangeLog index 673bd904dc..76af83b6ec 100644 --- a/binutils/ChangeLog +++ b/binutils/ChangeLog @@ -1,3 +1,8 @@ +2018-08-24 H.J. Lu + + * readelf.c (print_gnu_property_note): Check the + GNU_PROPERTY_X86_UINT32_VALID bit for invalid GNU property note. + 2018-08-23 Alan Modra * readelf.c (get_ppc64_symbol_other): Return NULL if st_other diff --git a/binutils/readelf.c b/binutils/readelf.c index 2d9d48d002..df946528ca 100644 --- a/binutils/readelf.c +++ b/binutils/readelf.c @@ -17067,30 +17067,56 @@ print_gnu_property_note (Filedata * filedata, Elf_Internal_Note * pnote) || filedata->file_header.e_machine == EM_IAMCU || filedata->file_header.e_machine == EM_386) { + unsigned int bitmask; + + if (datasz == 4) + { + bitmask = byte_get (ptr, 4); + if (filedata->file_header.e_type == ET_EXEC + || filedata->file_header.e_type == ET_DYN) + { + if ((bitmask & GNU_PROPERTY_X86_UINT32_VALID)) + bitmask &= ~GNU_PROPERTY_X86_UINT32_VALID; + else + printf ("Invalid "); + } + } + else + bitmask = 0; + switch (type) { case GNU_PROPERTY_X86_ISA_1_USED: - printf ("x86 ISA used: "); if (datasz != 4) - printf (_(" "), datasz); + printf (_("x86 ISA used: "), + datasz); else - decode_x86_isa (byte_get (ptr, 4)); + { + printf ("x86 ISA used: "); + decode_x86_isa (bitmask); + } goto next; case GNU_PROPERTY_X86_ISA_1_NEEDED: - printf ("x86 ISA needed: "); if (datasz != 4) - printf (_(" "), datasz); + printf (_("x86 ISA needed: "), + datasz); else - decode_x86_isa (byte_get (ptr, 4)); + { + printf ("x86 ISA needed: "); + decode_x86_isa (bitmask); + } goto next; case GNU_PROPERTY_X86_FEATURE_1_AND: - printf ("x86 feature: "); if (datasz != 4) - printf (_(" "), datasz); + printf (_("x86 feature: "), + datasz); else - decode_x86_feature (type, byte_get (ptr, 4)); + { + printf ("x86 feature: "); + decode_x86_feature (type, bitmask); + } goto next; default: diff --git a/include/ChangeLog b/include/ChangeLog index 69cc57d756..4b933b157e 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,7 @@ +2018-08-24 H.J. Lu + + * elf/common.h (GNU_PROPERTY_X86_UINT32_VALID): New. + 2018-08-21 John Darrington * elf/s12z.h: Rename R_S12Z_UKNWN_3 to R_S12Z_EXT18. diff --git a/include/elf/common.h b/include/elf/common.h index 1a940ff7b5..55c5505bac 100644 --- a/include/elf/common.h +++ b/include/elf/common.h @@ -752,6 +752,9 @@ #define GNU_PROPERTY_X86_ISA_1_NEEDED 0xc0000001 #define GNU_PROPERTY_X86_FEATURE_1_AND 0xc0000002 +/* Set by linker to indicate that the property is valid. */ +#define GNU_PROPERTY_X86_UINT32_VALID (1U << 31) + #define GNU_PROPERTY_X86_ISA_1_486 (1U << 0) #define GNU_PROPERTY_X86_ISA_1_586 (1U << 1) #define GNU_PROPERTY_X86_ISA_1_686 (1U << 2) -- 2.34.1