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Message-ID: <aa7b77aa-bf3a-6919-ed66-37af00d856d2@cambridgegreys.com>
Date: Fri, 6 Dec 2019 07:41:12 +0000
From: Anton Ivanov <anton.ivanov@...bridgegreys.com>
To: Brendan Higgins <brendanhiggins@...gle.com>, jdike@...toit.com,
richard@....at
Cc: johannes.berg@...el.com, linux-um@...ts.infradead.org,
linux-kernel@...r.kernel.org, davidgow@...gle.com
Subject: Re: [RFC v1 2/2] uml: remove support for CONFIG_STATIC_LINK
On 06/12/2019 02:01, Brendan Higgins wrote:
> CONFIG_STATIC_LINK appears to have been broken since before v4.20. It
> doesn't play nice with CONFIG_UML_NET_VECTOR=y:
>
> /usr/bin/ld: arch/um/drivers/vector_user.o: in function
> `user_init_socket_fds': vector_user.c:(.text+0x430): warning: Using
> 'getaddrinfo' in statically linked applications requires at runtime the
> shared libraries from the glibc version used for linking
>
> And it seems to break the ptrace check:
>
> Checking that ptrace can change system call numbers...check_ptrace :
> child exited with exitcode 6, while expecting 0; status 0x67f
> [1] 126822 abort ./linux mem=256M
>
> Given the importance of ptrace in UML, CONFIG_STATIC_LINK seems totally
> broken right now; remove it in order to fix allyesconfig for ARCH=um.
>
> Signed-off-by: Brendan Higgins <brendanhiggins@...gle.com>
> ---
> arch/um/Kconfig | 23 +----
> arch/um/Makefile | 3 +-
> arch/um/kernel/dyn.lds.S | 170 ----------------------------------
> arch/um/kernel/uml.lds.S | 115 -----------------------
> arch/um/kernel/vmlinux.lds.S | 175 ++++++++++++++++++++++++++++++++++-
> 5 files changed, 172 insertions(+), 314 deletions(-)
> delete mode 100644 arch/um/kernel/dyn.lds.S
> delete mode 100644 arch/um/kernel/uml.lds.S
>
> diff --git a/arch/um/Kconfig b/arch/um/Kconfig
> index 2a6d04fcb3e91..00927fb7ce67a 100644
> --- a/arch/um/Kconfig
> +++ b/arch/um/Kconfig
> @@ -19,6 +19,7 @@ config UML
> select GENERIC_CLOCKEVENTS
> select HAVE_GCC_PLUGINS
> select TTY # Needed for line.c
> + select MODULE_REL_CRCS if MODVERSIONS
>
> config MMU
> bool
> @@ -61,28 +62,6 @@ config NR_CPUS
>
> source "arch/$(HEADER_ARCH)/um/Kconfig"
>
> -config STATIC_LINK
> - bool "Force a static link"
> - default n
> - help
> - This option gives you the ability to force a static link of UML.
> - Normally, UML is linked as a shared binary. This is inconvenient for
> - use in a chroot jail. So, if you intend to run UML inside a chroot,
> - you probably want to say Y here.
> - Additionally, this option enables using higher memory spaces (up to
> - 2.75G) for UML.
> -
> -config LD_SCRIPT_STATIC
> - bool
> - default y
> - depends on STATIC_LINK
> -
> -config LD_SCRIPT_DYN
> - bool
> - default y
> - depends on !LD_SCRIPT_STATIC
> - select MODULE_REL_CRCS if MODVERSIONS
> -
> config HOSTFS
> tristate "Host filesystem"
> help
> diff --git a/arch/um/Makefile b/arch/um/Makefile
> index d2daa206872da..ec8af28daf051 100644
> --- a/arch/um/Makefile
> +++ b/arch/um/Makefile
> @@ -117,8 +117,7 @@ archheaders:
> archprepare:
> $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
>
> -LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
> -LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib $(call cc-option, -no-pie)
> +LINK-y += -Wl,-rpath,/lib $(call cc-option, -no-pie)
>
> CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
> $(call cc-option, -fno-stack-protector,) \
> diff --git a/arch/um/kernel/dyn.lds.S b/arch/um/kernel/dyn.lds.S
> deleted file mode 100644
> index c69d69ee96beb..0000000000000
> --- a/arch/um/kernel/dyn.lds.S
> +++ /dev/null
> @@ -1,170 +0,0 @@
> -#include <asm/vmlinux.lds.h>
> -#include <asm/page.h>
> -
> -OUTPUT_FORMAT(ELF_FORMAT)
> -OUTPUT_ARCH(ELF_ARCH)
> -ENTRY(_start)
> -jiffies = jiffies_64;
> -
> -SECTIONS
> -{
> - PROVIDE (__executable_start = START);
> - . = START + SIZEOF_HEADERS;
> - .interp : { *(.interp) }
> - __binary_start = .;
> - . = ALIGN(4096); /* Init code and data */
> - _text = .;
> - INIT_TEXT_SECTION(PAGE_SIZE)
> -
> - . = ALIGN(PAGE_SIZE);
> -
> - /* Read-only sections, merged into text segment: */
> - .hash : { *(.hash) }
> - .gnu.hash : { *(.gnu.hash) }
> - .dynsym : { *(.dynsym) }
> - .dynstr : { *(.dynstr) }
> - .gnu.version : { *(.gnu.version) }
> - .gnu.version_d : { *(.gnu.version_d) }
> - .gnu.version_r : { *(.gnu.version_r) }
> - .rel.init : { *(.rel.init) }
> - .rela.init : { *(.rela.init) }
> - .rel.text : { *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*) }
> - .rela.text : { *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*) }
> - .rel.fini : { *(.rel.fini) }
> - .rela.fini : { *(.rela.fini) }
> - .rel.rodata : { *(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*) }
> - .rela.rodata : { *(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*) }
> - .rel.data : { *(.rel.data .rel.data.* .rel.gnu.linkonce.d.*) }
> - .rela.data : { *(.rela.data .rela.data.* .rela.gnu.linkonce.d.*) }
> - .rel.tdata : { *(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*) }
> - .rela.tdata : { *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*) }
> - .rel.tbss : { *(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*) }
> - .rela.tbss : { *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*) }
> - .rel.ctors : { *(.rel.ctors) }
> - .rela.ctors : { *(.rela.ctors) }
> - .rel.dtors : { *(.rel.dtors) }
> - .rela.dtors : { *(.rela.dtors) }
> - .rel.got : { *(.rel.got) }
> - .rela.got : { *(.rela.got) }
> - .rel.bss : { *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*) }
> - .rela.bss : { *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*) }
> - .rel.plt : {
> - *(.rel.plt)
> - PROVIDE_HIDDEN(__rel_iplt_start = .);
> - *(.rel.iplt)
> - PROVIDE_HIDDEN(__rel_iplt_end = .);
> - }
> - .rela.plt : {
> - *(.rela.plt)
> - PROVIDE_HIDDEN(__rela_iplt_start = .);
> - *(.rela.iplt)
> - PROVIDE_HIDDEN(__rela_iplt_end = .);
> - }
> - .init : {
> - KEEP (*(.init))
> - } =0x90909090
> - .plt : { *(.plt) }
> - .text : {
> - _stext = .;
> - TEXT_TEXT
> - SCHED_TEXT
> - CPUIDLE_TEXT
> - LOCK_TEXT
> - IRQENTRY_TEXT
> - SOFTIRQENTRY_TEXT
> - *(.fixup)
> - *(.stub .text.* .gnu.linkonce.t.*)
> - /* .gnu.warning sections are handled specially by elf32.em. */
> - *(.gnu.warning)
> -
> - . = ALIGN(PAGE_SIZE);
> - } =0x90909090
> - . = ALIGN(PAGE_SIZE);
> - .syscall_stub : {
> - __syscall_stub_start = .;
> - *(.__syscall_stub*)
> - __syscall_stub_end = .;
> - }
> - .fini : {
> - KEEP (*(.fini))
> - } =0x90909090
> -
> - .kstrtab : { *(.kstrtab) }
> -
> - #include <asm/common.lds.S>
> -
> - __init_begin = .;
> - init.data : { INIT_DATA }
> - __init_end = .;
> -
> - /* Ensure the __preinit_array_start label is properly aligned. We
> - could instead move the label definition inside the section, but
> - the linker would then create the section even if it turns out to
> - be empty, which isn't pretty. */
> - . = ALIGN(32 / 8);
> - .preinit_array : { *(.preinit_array) }
> - .fini_array : { *(.fini_array) }
> - .data : {
> - INIT_TASK_DATA(KERNEL_STACK_SIZE)
> - . = ALIGN(KERNEL_STACK_SIZE);
> - *(.data..init_irqstack)
> - DATA_DATA
> - *(.data.* .gnu.linkonce.d.*)
> - SORT(CONSTRUCTORS)
> - }
> - .data1 : { *(.data1) }
> - .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
> - .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
> - .eh_frame : { KEEP (*(.eh_frame)) }
> - .gcc_except_table : { *(.gcc_except_table) }
> - .dynamic : { *(.dynamic) }
> - .ctors : {
> - /* gcc uses crtbegin.o to find the start of
> - the constructors, so we make sure it is
> - first. Because this is a wildcard, it
> - doesn't matter if the user does not
> - actually link against crtbegin.o; the
> - linker won't look for a file to match a
> - wildcard. The wildcard also means that it
> - doesn't matter which directory crtbegin.o
> - is in. */
> - KEEP (*crtbegin.o(.ctors))
> - /* We don't want to include the .ctor section from
> - from the crtend.o file until after the sorted ctors.
> - The .ctor section from the crtend file contains the
> - end of ctors marker and it must be last */
> - KEEP (*(EXCLUDE_FILE (*crtend.o ) .ctors))
> - KEEP (*(SORT(.ctors.*)))
> - KEEP (*(.ctors))
> - }
> - .dtors : {
> - KEEP (*crtbegin.o(.dtors))
> - KEEP (*(EXCLUDE_FILE (*crtend.o ) .dtors))
> - KEEP (*(SORT(.dtors.*)))
> - KEEP (*(.dtors))
> - }
> - .jcr : { KEEP (*(.jcr)) }
> - .got : { *(.got.plt) *(.got) }
> - _edata = .;
> - PROVIDE (edata = .);
> - .bss : {
> - __bss_start = .;
> - *(.dynbss)
> - *(.bss .bss.* .gnu.linkonce.b.*)
> - *(COMMON)
> - /* Align here to ensure that the .bss section occupies space up to
> - _end. Align after .bss to ensure correct alignment even if the
> - .bss section disappears because there are no input sections. */
> - . = ALIGN(32 / 8);
> - . = ALIGN(32 / 8);
> - }
> - __bss_stop = .;
> - _end = .;
> - PROVIDE (end = .);
> -
> - STABS_DEBUG
> -
> - DWARF_DEBUG
> -
> - DISCARDS
> -}
> diff --git a/arch/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S
> deleted file mode 100644
> index 9f21443be2c9e..0000000000000
> --- a/arch/um/kernel/uml.lds.S
> +++ /dev/null
> @@ -1,115 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#include <asm/vmlinux.lds.h>
> -#include <asm/page.h>
> -
> -OUTPUT_FORMAT(ELF_FORMAT)
> -OUTPUT_ARCH(ELF_ARCH)
> -ENTRY(_start)
> -jiffies = jiffies_64;
> -
> -SECTIONS
> -{
> - /* This must contain the right address - not quite the default ELF one.*/
> - PROVIDE (__executable_start = START);
> - /* Static binaries stick stuff here, like the sigreturn trampoline,
> - * invisibly to objdump. So, just make __binary_start equal to the very
> - * beginning of the executable, and if there are unmapped pages after this,
> - * they are forever unusable.
> - */
> - __binary_start = START;
> -
> - . = START + SIZEOF_HEADERS;
> -
> - _text = .;
> - INIT_TEXT_SECTION(0)
> - . = ALIGN(PAGE_SIZE);
> -
> - .text :
> - {
> - _stext = .;
> - TEXT_TEXT
> - SCHED_TEXT
> - CPUIDLE_TEXT
> - LOCK_TEXT
> - IRQENTRY_TEXT
> - SOFTIRQENTRY_TEXT
> - *(.fixup)
> - /* .gnu.warning sections are handled specially by elf32.em. */
> - *(.gnu.warning)
> - *(.gnu.linkonce.t*)
> - }
> -
> - . = ALIGN(PAGE_SIZE);
> - .syscall_stub : {
> - __syscall_stub_start = .;
> - *(.__syscall_stub*)
> - __syscall_stub_end = .;
> - }
> -
> - /*
> - * These are needed even in a static link, even if they wind up being empty.
> - * Newer glibc needs these __rel{,a}_iplt_{start,end} symbols.
> - */
> - .rel.plt : {
> - *(.rel.plt)
> - PROVIDE_HIDDEN(__rel_iplt_start = .);
> - *(.rel.iplt)
> - PROVIDE_HIDDEN(__rel_iplt_end = .);
> - }
> - .rela.plt : {
> - *(.rela.plt)
> - PROVIDE_HIDDEN(__rela_iplt_start = .);
> - *(.rela.iplt)
> - PROVIDE_HIDDEN(__rela_iplt_end = .);
> - }
> -
> - #include <asm/common.lds.S>
> -
> - __init_begin = .;
> - init.data : { INIT_DATA }
> - __init_end = .;
> -
> - .data :
> - {
> - INIT_TASK_DATA(KERNEL_STACK_SIZE)
> - . = ALIGN(KERNEL_STACK_SIZE);
> - *(.data..init_irqstack)
> - DATA_DATA
> - *(.gnu.linkonce.d*)
> - CONSTRUCTORS
> - }
> - .data1 : { *(.data1) }
> - .ctors :
> - {
> - *(.ctors)
> - }
> - .dtors :
> - {
> - *(.dtors)
> - }
> -
> - .got : { *(.got.plt) *(.got) }
> - .dynamic : { *(.dynamic) }
> - .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
> - .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
> - /* We want the small data sections together, so single-instruction offsets
> - can access them all, and initialized data all before uninitialized, so
> - we can shorten the on-disk segment size. */
> - .sdata : { *(.sdata) }
> - _edata = .;
> - PROVIDE (edata = .);
> - . = ALIGN(PAGE_SIZE);
> - __bss_start = .;
> - PROVIDE(_bss_start = .);
> - SBSS(0)
> - BSS(0)
> - __bss_stop = .;
> - _end = .;
> - PROVIDE (end = .);
> -
> - STABS_DEBUG
> -
> - DWARF_DEBUG
> -
> - DISCARDS
> -}
> diff --git a/arch/um/kernel/vmlinux.lds.S b/arch/um/kernel/vmlinux.lds.S
> index 16e49bfa2b426..f4b6114e54d62 100644
> --- a/arch/um/kernel/vmlinux.lds.S
> +++ b/arch/um/kernel/vmlinux.lds.S
> @@ -1,8 +1,173 @@
>
> KERNEL_STACK_SIZE = 4096 * (1 << CONFIG_KERNEL_STACK_ORDER);
>
> -#ifdef CONFIG_LD_SCRIPT_STATIC
> -#include "uml.lds.S"
> -#else
> -#include "dyn.lds.S"
> -#endif
> +#include <asm/vmlinux.lds.h>
> +#include <asm/page.h>
> +
> +OUTPUT_FORMAT(ELF_FORMAT)
> +OUTPUT_ARCH(ELF_ARCH)
> +ENTRY(_start)
> +jiffies = jiffies_64;
> +
> +SECTIONS
> +{
> + PROVIDE (__executable_start = START);
> + . = START + SIZEOF_HEADERS;
> + .interp : { *(.interp) }
> + __binary_start = .;
> + . = ALIGN(4096); /* Init code and data */
> + _text = .;
> + INIT_TEXT_SECTION(PAGE_SIZE)
> +
> + . = ALIGN(PAGE_SIZE);
> +
> + /* Read-only sections, merged into text segment: */
> + .hash : { *(.hash) }
> + .gnu.hash : { *(.gnu.hash) }
> + .dynsym : { *(.dynsym) }
> + .dynstr : { *(.dynstr) }
> + .gnu.version : { *(.gnu.version) }
> + .gnu.version_d : { *(.gnu.version_d) }
> + .gnu.version_r : { *(.gnu.version_r) }
> + .rel.init : { *(.rel.init) }
> + .rela.init : { *(.rela.init) }
> + .rel.text : { *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*) }
> + .rela.text : { *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*) }
> + .rel.fini : { *(.rel.fini) }
> + .rela.fini : { *(.rela.fini) }
> + .rel.rodata : { *(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*) }
> + .rela.rodata : { *(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*) }
> + .rel.data : { *(.rel.data .rel.data.* .rel.gnu.linkonce.d.*) }
> + .rela.data : { *(.rela.data .rela.data.* .rela.gnu.linkonce.d.*) }
> + .rel.tdata : { *(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*) }
> + .rela.tdata : { *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*) }
> + .rel.tbss : { *(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*) }
> + .rela.tbss : { *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*) }
> + .rel.ctors : { *(.rel.ctors) }
> + .rela.ctors : { *(.rela.ctors) }
> + .rel.dtors : { *(.rel.dtors) }
> + .rela.dtors : { *(.rela.dtors) }
> + .rel.got : { *(.rel.got) }
> + .rela.got : { *(.rela.got) }
> + .rel.bss : { *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*) }
> + .rela.bss : { *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*) }
> + .rel.plt : {
> + *(.rel.plt)
> + PROVIDE_HIDDEN(__rel_iplt_start = .);
> + *(.rel.iplt)
> + PROVIDE_HIDDEN(__rel_iplt_end = .);
> + }
> + .rela.plt : {
> + *(.rela.plt)
> + PROVIDE_HIDDEN(__rela_iplt_start = .);
> + *(.rela.iplt)
> + PROVIDE_HIDDEN(__rela_iplt_end = .);
> + }
> + .init : {
> + KEEP (*(.init))
> + } =0x90909090
> + .plt : { *(.plt) }
> + .text : {
> + _stext = .;
> + TEXT_TEXT
> + SCHED_TEXT
> + CPUIDLE_TEXT
> + LOCK_TEXT
> + IRQENTRY_TEXT
> + SOFTIRQENTRY_TEXT
> + *(.fixup)
> + *(.stub .text.* .gnu.linkonce.t.*)
> + /* .gnu.warning sections are handled specially by elf32.em. */
> + *(.gnu.warning)
> +
> + . = ALIGN(PAGE_SIZE);
> + } =0x90909090
> + . = ALIGN(PAGE_SIZE);
> + .syscall_stub : {
> + __syscall_stub_start = .;
> + *(.__syscall_stub*)
> + __syscall_stub_end = .;
> + }
> + .fini : {
> + KEEP (*(.fini))
> + } =0x90909090
> +
> + .kstrtab : { *(.kstrtab) }
> +
> + #include <asm/common.lds.S>
> +
> + __init_begin = .;
> + init.data : { INIT_DATA }
> + __init_end = .;
> +
> + /* Ensure the __preinit_array_start label is properly aligned. We
> + could instead move the label definition inside the section, but
> + the linker would then create the section even if it turns out to
> + be empty, which isn't pretty. */
> + . = ALIGN(32 / 8);
> + .preinit_array : { *(.preinit_array) }
> + .fini_array : { *(.fini_array) }
> + .data : {
> + INIT_TASK_DATA(KERNEL_STACK_SIZE)
> + . = ALIGN(KERNEL_STACK_SIZE);
> + *(.data..init_irqstack)
> + DATA_DATA
> + *(.data.* .gnu.linkonce.d.*)
> + SORT(CONSTRUCTORS)
> + }
> + .data1 : { *(.data1) }
> + .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
> + .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
> + .eh_frame : { KEEP (*(.eh_frame)) }
> + .gcc_except_table : { *(.gcc_except_table) }
> + .dynamic : { *(.dynamic) }
> + .ctors : {
> + /* gcc uses crtbegin.o to find the start of
> + the constructors, so we make sure it is
> + first. Because this is a wildcard, it
> + doesn't matter if the user does not
> + actually link against crtbegin.o; the
> + linker won't look for a file to match a
> + wildcard. The wildcard also means that it
> + doesn't matter which directory crtbegin.o
> + is in. */
> + KEEP (*crtbegin.o(.ctors))
> + /* We don't want to include the .ctor section from
> + from the crtend.o file until after the sorted ctors.
> + The .ctor section from the crtend file contains the
> + end of ctors marker and it must be last */
> + KEEP (*(EXCLUDE_FILE (*crtend.o ) .ctors))
> + KEEP (*(SORT(.ctors.*)))
> + KEEP (*(.ctors))
> + }
> + .dtors : {
> + KEEP (*crtbegin.o(.dtors))
> + KEEP (*(EXCLUDE_FILE (*crtend.o ) .dtors))
> + KEEP (*(SORT(.dtors.*)))
> + KEEP (*(.dtors))
> + }
> + .jcr : { KEEP (*(.jcr)) }
> + .got : { *(.got.plt) *(.got) }
> + _edata = .;
> + PROVIDE (edata = .);
> + .bss : {
> + __bss_start = .;
> + *(.dynbss)
> + *(.bss .bss.* .gnu.linkonce.b.*)
> + *(COMMON)
> + /* Align here to ensure that the .bss section occupies space up to
> + _end. Align after .bss to ensure correct alignment even if the
> + .bss section disappears because there are no input sections. */
> + . = ALIGN(32 / 8);
> + . = ALIGN(32 / 8);
> + }
> + __bss_stop = .;
> + _end = .;
> + PROVIDE (end = .);
> +
> + STABS_DEBUG
> +
> + DWARF_DEBUG
> +
> + DISCARDS
> +}
>
The ptrace check was discussed on the list this week - it is the enable
constructors commit in 5.3-rc1.
A patch reverting it was submitted by Johannes yesterday.
I did not try disabling/enabling static link - good catch.
Otherwise, I agree - static link should probably go.
Adding PCAP throws even more warnings and the AF_XDP work I have in
progress generates a whole page of them. Considering that the resulting
executable is not really static there is no point keeping the option.
--
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/
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