https://sourceware.org/bugzilla/show_bug.cgi?id=29592
Bug ID: 29592
Summary: [2.39 Regression][bisected] Exec stack warning causes
go programs with cgo to fail to link on mips
Product: binutils
Version: 2.39
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: matoro_bugzilla_glibc at matoro dot tk
Target Milestone: ---
65daf5bed68f3e792e80f7c9a12871fd71da32a2 is the first bad commit
commit 65daf5bed68f3e792e80f7c9a12871fd71da32a2
Author: Nick Clifton <ni...@redhat.com>
Date: Wed Apr 20 13:37:51 2022 +0100
Add linker warning for when it creates an executable stack.
PR 29072
On mips, since this commit, all linking prints the following warning:
/usr/lib/gcc/mips64-unknown-linux-gnu/12.2.0/../../../../mips64-unknown-linux-gnu/bin/ld:
warning:
/usr/lib/gcc/mips64-unknown-linux-gnu/12.2.0/../../../../lib64/Scrt1.o:
requires executable stack (because the .note.GNU-stack section is executable)
This seems to be harmless most of the time. However this commit also seems to
have made it impossible to link golang programs (including golang itself) when
cgo is enabled (which is the default unless explicitly disabled with
CGO_ENABLED=0). The linker will print the following error thousands of times,
one for every single local symbol:
+ ./cmd/dist/dist bootstrap -a
Building Go toolchain1 using /usr/lib/go-bootstrap.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
Building Go toolchain3 using go_bootstrap and Go toolchain2.
Building packages and commands for linux/mips64.
# cmd/trace
/var/tmp/portage/dev-lang/go-1.19.1/work/go/pkg/tool/linux_mips64/link: running
mips64-unknown-linux-gnu-gcc failed: exit status 1
/var/tmp/portage/dev-lang/go-1.19.1/temp/go-link-3757955373/go.o: in function
`internal/cpu.Initialize':
/usr/lib/go/src/internal/cpu/cpu.go:123:(.text+0x14): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:124:(.text+0x30): relocation R_MIPS_HI16
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/var/tmp/portage/dev-lang/go-1.19.1/temp/go-link-3757955373/go.o: in function
`internal/cpu.Initialize':
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:22:(.text+0x40): relocation
R_MIPS_26 against `a local symbol' cannot be used when making a shared object;
recompile with -fPIC
/var/tmp/portage/dev-lang/go-1.19.1/temp/go-link-3757955373/go.o: in function
`internal/cpu.doinit':
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:23:(.text+0x54): relocation
R_MIPS_HI16 against `a local symbol' cannot be used when making a shared
object; recompile with -fPIC
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:23:(.text+0x64): relocation
R_MIPS_HI16 against `a local symbol' cannot be used when making a shared
object; recompile with -fPIC
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:22:(.text+0x78): relocation
R_MIPS_HI16 against `a local symbol' cannot be used when making a shared
object; recompile with -fPIC
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:22:(.text+0x84): relocation
R_MIPS_HI16 against `a local symbol' cannot be used when making a shared
object; recompile with -fPIC
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:22:(.text+0x90): relocation
R_MIPS_HI16 against `a local symbol' cannot be used when making a shared
object; recompile with -fPIC
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:22:(.text+0xa4): relocation
R_MIPS_HI16 against `a local symbol' cannot be used when making a shared
object; recompile with -fPIC
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:22:(.text+0xb8): relocation
R_MIPS_HI16 against `a local symbol' cannot be used when making a shared
object; recompile with -fPIC
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:22:(.text+0xc4): relocation
R_MIPS_26 against `a local symbol' cannot be used when making a shared object;
recompile with -fPIC
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:27:(.text+0xcc): relocation
R_MIPS_HI16 against `a local symbol' cannot be used when making a shared
object; recompile with -fPIC
/usr/lib/go/src/internal/cpu/cpu_mips64x.go:27:(.text+0xe4): relocation
R_MIPS_HI16 against `a local symbol' cannot be used when making a shared
object; recompile with -fPIC
/var/tmp/portage/dev-lang/go-1.19.1/temp/go-link-3757955373/go.o: in function
`internal/cpu.Initialize':
/usr/lib/go/src/internal/cpu/cpu.go:125:(.text+0x100): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/var/tmp/portage/dev-lang/go-1.19.1/temp/go-link-3757955373/go.o: in function
`internal/cpu.processOptions':
/usr/lib/go/src/internal/cpu/cpu.go:148:(.text+0x130): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:180:(.text+0x34c): relocation R_MIPS_HI16
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:187:(.text+0x368): relocation R_MIPS_HI16
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x384): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x38c): relocation R_MIPS_HI16
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x3a4): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x3bc): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x3c4): relocation R_MIPS_HI16
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x3dc): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x3f4): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x3fc): relocation R_MIPS_HI16
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x414): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:175:(.text+0x41c): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:163:(.text+0x43c): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:163:(.text+0x444): relocation R_MIPS_HI16
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:163:(.text+0x45c): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
/usr/lib/go/src/internal/cpu/cpu.go:163:(.text+0x474): relocation R_MIPS_26
against `a local symbol' cannot be used when making a shared object; recompile
with -fPIC
And so on for a huge length, eventually erroring. There is one final warning
at the end:
/usr/lib/gcc/mips64-unknown-linux-gnu/12.2.0/../../../../mips64-unknown-linux-gnu/bin/ld:
warning: creating DT_TEXTREL in a PIE
Linking C programs, other than the execstack warning, still works even after
this commit; only golang programs are affected.
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