From: "H.J. Lu" <hjl.tools@gmail.com>
To: Binutils <binutils@sourceware.org>
Subject: [PATCH] ld: Pass -nostdlib to compiler with -r
Date: Mon, 18 Jul 2022 18:53:07 -0700 [thread overview]
Message-ID: <CAMe9rOr+ku+7VxbJS1zkLauD7h_uX193YyLPy84+md+37OmSOQ@mail.gmail.com> (raw)
In-Reply-To: <20220718200037.1129322-1-hjl.tools@gmail.com>
[-- Attachment #1: Type: text/plain, Size: 3757 bytes --]
On Mon, Jul 18, 2022 at 1:00 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> Only check invalid relocation against protected symbol defined in shared
> object.
>
> bfd/
>
> PR ld/29377
> * elf32-i386.c (elf_i386_scan_relocs): Only check invalid
> relocation against protected symbol defined in shared object.
> * elf64-x86-64.c (elf_x86_64_scan_relocs): Likewise.
>
> ld/
>
> PR ld/29377
> * testsuite/ld-elf/linux-x86.exp: Run PR ld/29377 tests.
> * testsuite/ld-elf/pr29377a.c: New file.
> * testsuite/ld-elf/pr29377b.c: Likewise.
> ---
> bfd/elf32-i386.c | 2 ++
> bfd/elf64-x86-64.c | 2 ++
> ld/testsuite/ld-elf/linux-x86.exp | 16 ++++++++++++++++
> ld/testsuite/ld-elf/pr29377a.c | 5 +++++
> ld/testsuite/ld-elf/pr29377b.c | 10 ++++++++++
> 5 files changed, 35 insertions(+)
> create mode 100644 ld/testsuite/ld-elf/pr29377a.c
> create mode 100644 ld/testsuite/ld-elf/pr29377b.c
>
> diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c
> index e4106d9fd3b..3d39dc07fe0 100644
> --- a/bfd/elf32-i386.c
> +++ b/bfd/elf32-i386.c
> @@ -1811,6 +1811,8 @@ elf_i386_scan_relocs (bfd *abfd,
> if (h->pointer_equality_needed
> && h->type == STT_FUNC
> && eh->def_protected
> + && !SYMBOL_DEFINED_NON_SHARED_P (h)
> + && h->def_dynamic
> && elf_has_indirect_extern_access (h->root.u.def.section->owner))
> {
> /* Disallow non-canonical reference to canonical
> diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c
> index 6154a70bdd7..48ca6309d1b 100644
> --- a/bfd/elf64-x86-64.c
> +++ b/bfd/elf64-x86-64.c
> @@ -2254,6 +2254,8 @@ elf_x86_64_scan_relocs (bfd *abfd, struct bfd_link_info *info,
> if (h->pointer_equality_needed
> && h->type == STT_FUNC
> && eh->def_protected
> + && !SYMBOL_DEFINED_NON_SHARED_P (h)
> + && h->def_dynamic
> && elf_has_indirect_extern_access (h->root.u.def.section->owner))
> {
> /* Disallow non-canonical reference to canonical
> diff --git a/ld/testsuite/ld-elf/linux-x86.exp b/ld/testsuite/ld-elf/linux-x86.exp
> index 6035ecd6829..0f0a6f01ec0 100644
> --- a/ld/testsuite/ld-elf/linux-x86.exp
> +++ b/ld/testsuite/ld-elf/linux-x86.exp
> @@ -134,6 +134,22 @@ run_cc_link_tests [list \
> {{readelf {--dyn-syms -W} pr28158.rd} {nm -D pr28158.nd}} \
> "pr28158" \
> ] \
> + [list \
> + "Build pr29377.o" \
> + "-r -Wl,-z,noexecstack" \
I am checking in this to add -nostdlib.
> + "" \
> + {pr29377a.c indirect-extern-access.S} \
> + {} \
> + "pr29377.o" \
> + ] \
> + [list \
> + "Build pr29377" \
> + "$NOPIE_LDFLAGS tmpdir/pr29377.o" \
> + "-fPIC" \
> + {pr29377b.c} \
> + {} \
> + "pr29377" \
> + ] \
> ]
>
> run_ld_link_exec_tests [list \
> diff --git a/ld/testsuite/ld-elf/pr29377a.c b/ld/testsuite/ld-elf/pr29377a.c
> new file mode 100644
> index 00000000000..41d9545e3bf
> --- /dev/null
> +++ b/ld/testsuite/ld-elf/pr29377a.c
> @@ -0,0 +1,5 @@
> +__attribute__ ((visibility ("protected")))
> +void
> +foo (void)
> +{
> +}
> diff --git a/ld/testsuite/ld-elf/pr29377b.c b/ld/testsuite/ld-elf/pr29377b.c
> new file mode 100644
> index 00000000000..3cf163b25b4
> --- /dev/null
> +++ b/ld/testsuite/ld-elf/pr29377b.c
> @@ -0,0 +1,10 @@
> +extern void foo (void);
> +
> +void (*foo_p) (void);
> +
> +int
> +main ()
> +{
> + foo_p = foo;
> + return 0;
> +}
> --
> 2.36.1
>
--
H.J.
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From 0ac83a32aac4a3f57ee20536b16eb957a009fdc9 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Mon, 18 Jul 2022 18:49:27 -0700
Subject: [PATCH] ld: Pass -nostdlib to compiler with -r
Pass -nostdlib to compiler with -r to avoid unnecessary .o file and
libraries.
* testsuite/ld-elf/linux-x86.exp: Pass -nostdlib with -r.
---
ld/testsuite/ld-elf/linux-x86.exp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/ld/testsuite/ld-elf/linux-x86.exp b/ld/testsuite/ld-elf/linux-x86.exp
index 0f0a6f01ec0..06379057ff2 100644
--- a/ld/testsuite/ld-elf/linux-x86.exp
+++ b/ld/testsuite/ld-elf/linux-x86.exp
@@ -136,7 +136,7 @@ run_cc_link_tests [list \
] \
[list \
"Build pr29377.o" \
- "-r -Wl,-z,noexecstack" \
+ "-r -nostdlib -Wl,-z,noexecstack" \
"" \
{pr29377a.c indirect-extern-access.S} \
{} \
--
2.36.1
next prev parent reply other threads:[~2022-07-19 1:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-18 20:00 [PATCH] x86: Properly check invalid relocation against protected symbol H.J. Lu
2022-07-19 1:53 ` H.J. Lu [this message]
2022-07-19 16:00 ` H.J. Lu
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