From: Efraim Flashner <efraim@flashner.co.il>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: guix-devel@gnu.org
Subject: Re: chroot/aarch64 issues
Date: Tue, 5 Jul 2016 15:28:48 +0300 [thread overview]
Message-ID: <20160705122848.GE6523@debian-netbook> (raw)
In-Reply-To: <87oa6czd4w.fsf@gnu.org>
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On Tue, Jul 05, 2016 at 10:45:51AM +0200, Ludovic Courtès wrote:
> Efraim Flashner <efraim@flashner.co.il> skribis:
>
> > On Mon, Jul 04, 2016 at 03:37:12PM +0200, Ludovic Courtès wrote:
> >> Hi!
>
> If the kernel config corresponds to this kernel, I don’t see which of
> the other EINVAL reasons given in clone(2) would apply. Does ‘dmesg’
> show something?
>
> Could you maybe try a C program that invokes clone(2) and progressively
> remove CLONE_ flags until you find the one that’s causing EINVAL?
>
> Thanks,
> Ludo’.
I grabbed the code from man 2 clone and ran that on the odroid, which
told me "clone: Operation not permitted"
--
Efraim Flashner <efraim@flashner.co.il> אפרים פלשנר
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[-- Attachment #1.2: clone.c --]
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#define _GNU_SOURCE
#include <sys/wait.h>
#include <sys/utsname.h>
#include <sched.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define errExit(msg) do { perror(msg); exit(EXIT_FAILURE); \
} while (0)
static int /* Start function for cloned child */
childFunc(void *arg)
{
struct utsname uts;
/* Change hostname in UTS namespace of child */
if (sethostname(arg, strlen(arg)) == -1)
errExit("sethostname");
/* Retrieve and display hostname */
if (uname(&uts) == -1)
errExit("uname");
printf("uts.nodename in child: %s\n", uts.nodename);
/* Keep the namespace open for a while, by sleeping.
* This allows some experimentation--for example, another
* process might join the namespace. */
sleep(200);
return 0; /* Child terminates now */
}
#define STACK_SIZE (1024 * 1024) /* Stack size for cloned child */
int
main(int argc, char *argv[])
{
char *stack; /* Start of stack buffer */
char *stackTop; /* End of stack buffer */
pid_t pid;
struct utsname uts;
if (argc < 2) {
fprintf(stderr, "Usage: %s <child-hostname>\n", argv[0]);
exit(EXIT_SUCCESS);
}
/* Allocate stack for child */
stack = malloc(STACK_SIZE);
if (stack == NULL)
errExit("malloc");
stackTop = stack + STACK_SIZE; /* Assume stack grows downward */
/* Create child that has its own UTS namespace;
* child commences execution in childFunc() */
pid = clone(childFunc, stackTop, CLONE_NEWUTS | SIGCHLD, argv[1]);
if (pid == -1)
errExit("clone");
printf("clone() returned %ld\n", (long) pid);
/* Parent falls through to here */
sleep(1); /* Give child time to change its hostname */
/* Display hostname in parent's UTS namespace. This will be
* different from hostname in child's UTS namespace. */
if (uname(&uts) == -1)
errExit("uname");
printf("uts.nodename in parent: %s\n", uts.nodename);
if (waitpid(pid, NULL, 0) == -1) /* Wait for child */
errExit("waitpid");
printf("child has terminated\n");
exit(EXIT_SUCCESS);
}
[-- Attachment #1.3: clone_strace --]
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10416 execve("./a.out", ["./a.out", "hello_world"], [/* 18 vars */]) = 0
10416 brk(0) = 0x411000
10416 faccessat(AT_FDCWD, "/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
10416 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa049e000
10416 faccessat(AT_FDCWD, "/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
10416 openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
10416 fstat(3, {st_mode=S_IFREG|0644, st_size=22634, ...}) = 0
10416 mmap(NULL, 22634, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fa0498000
10416 close(3) = 0
10416 faccessat(AT_FDCWD, "/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
10416 openat(AT_FDCWD, "/lib/aarch64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
10416 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\250\16\2\0\0\0\0\0"..., 832) = 832
10416 fstat(3, {st_mode=S_IFREG|0755, st_size=1287872, ...}) = 0
10416 mmap(NULL, 1360760, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fa032a000
10416 mprotect(0x7fa045d000, 65536, PROT_NONE) = 0
10416 mmap(0x7fa046d000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x133000) = 0x7fa046d000
10416 mmap(0x7fa0473000, 13176, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fa0473000
10416 close(3) = 0
10416 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa0497000
10416 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa0496000
10416 mprotect(0x7fa046d000, 16384, PROT_READ) = 0
10416 mprotect(0x7fa04a2000, 4096, PROT_READ) = 0
10416 munmap(0x7fa0498000, 22634) = 0
10416 mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa0229000
10416 clone(child_stack=0x7fa0329000, flags=CLONE_NEWUTS|SIGCHLD) = -1 EPERM (Operation not permitted)
10416 dup(2) = 3
10416 fcntl(3, F_GETFL) = 0x20002 (flags O_RDWR|0x20000)
10416 brk(0) = 0x411000
10416 brk(0x432000) = 0x432000
10416 fstat(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 3), ...}) = 0
10416 mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa0219000
10416 lseek(3, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
10416 write(3, "clone: Operation not permitted\n", 31) = 31
10416 close(3) = 0
10416 munmap(0x7fa0219000, 65536) = 0
10416 exit_group(1) = ?
10416 +++ exited with 1 +++
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next prev parent reply other threads:[~2016-07-05 12:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-04 10:42 chroot/aarch64 issues Efraim Flashner
2016-07-04 13:37 ` Ludovic Courtès
2016-07-04 14:15 ` Efraim Flashner
2016-07-05 8:45 ` Ludovic Courtès
2016-07-05 11:45 ` Efraim Flashner
2016-07-05 12:28 ` Efraim Flashner [this message]
2016-07-05 14:44 ` Ludovic Courtès
2016-07-05 17:09 ` Efraim Flashner
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