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chrootenv: print sysctl command for Debian users, fixes #32876

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This commit is contained in:
Yegor Timoshenko 2017-12-20 03:02:17 +00:00
parent c082544a52
commit ef1accae91
1 changed files with 13 additions and 5 deletions
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18
pkgs/build-support/build-fhs-userenv/chrootenv.c
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@ -98,10 +98,12 @@ int nftw_rm(const char *path, const struct stat *sb, int type,
#define LEN(x) sizeof(x) / sizeof(*x)
#define REQUIREMENTS "Linux version >= 3.19 built with CONFIG_USER_NS option"
int main(int argc, char *argv[]) {
if (argc < 2) {
fprintf(stderr, "Usage: %s command [arguments...]\n"
"Requires Linux kernel >= 3.19 with CONFIG_USER_NS.\n",
"Requires " REQUIREMENTS ".\n",
argv[0]);
exit(EX_USAGE);
}
@ -128,7 +130,7 @@ int main(int argc, char *argv[]) {
// If we are root, no need to create new user namespace.
if (uid == 0) {
if (unshare(CLONE_NEWNS) < 0)
errorf(EX_OSERR, "unshare() failed: You may have an old kernel or have CLONE_NEWUSER disabled by your distribution security settings.");
errorf(EX_OSERR, "unshare: requires " REQUIREMENTS);
// Mark all mounted filesystems as slave so changes
// don't propagate to the parent mount namespace.
if (mount(NULL, "/", NULL, MS_REC | MS_SLAVE, NULL) < 0)
@ -136,8 +138,13 @@ int main(int argc, char *argv[]) {
} else {
// Create new mount and user namespaces. CLONE_NEWUSER
// requires a program to be non-threaded.
if (unshare(CLONE_NEWNS | CLONE_NEWUSER) < 0)
errorf(EX_OSERR, "unshare");
if (unshare(CLONE_NEWNS | CLONE_NEWUSER) < 0) {
if (access("/tmp/proc/sys/kernel/unprivileged_userns_clone", F_OK) < 0)
errorf(EX_OSERR, "unshare: requires " REQUIREMENTS);
else
errorf(EX_OSERR, "unshare: run `sudo sysctl -w "
"kernel.unprivileged_userns_clone=1`");
}
// Map users and groups to the parent namespace.
// setgroups is only available since Linux 3.19:
@ -170,7 +177,8 @@ int main(int argc, char *argv[]) {
if (waitpid(cpid, &status, 0) < 0)
errorf(EX_OSERR, "waitpid");
if (nftw(root, nftw_rm, getdtablesize(), FTW_DEPTH | FTW_MOUNT | FTW_PHYS) < 0)
if (nftw(root, nftw_rm, getdtablesize(), FTW_DEPTH | FTW_MOUNT | FTW_PHYS) <
0)
errorf(EX_IOERR, "nftw");
if (WIFEXITED(status))