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Only mount /sys in uid-range builds

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Maybe this should be a separate system feature... /sys exposes a lot
of impure info about the host system.
This commit is contained in:
Eelco Dolstra 2020-05-20 11:57:33 +02:00
parent 8c4cce553c
commit 7349f257da
2 changed files with 7 additions and 6 deletions
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5
src/libstore/build.cc
View file

@ -3173,11 +3173,12 @@ void DerivationGoal::runChild()
if (mount("none", (chrootRootDir + "/proc").c_str(), "proc", 0, 0) == -1) if (mount("none", (chrootRootDir + "/proc").c_str(), "proc", 0, 0) == -1)
throw SysError("mounting /proc"); throw SysError("mounting /proc");
/* Mount sysfs on /sys. FIXME: only in user namespace /* Mount sysfs on /sys. */
builds. */ if (useUidRange) {
createDirs(chrootRootDir + "/sys"); createDirs(chrootRootDir + "/sys");
if (mount("none", (chrootRootDir + "/sys").c_str(), "sysfs", 0, 0) == -1) if (mount("none", (chrootRootDir + "/sys").c_str(), "sysfs", 0, 0) == -1)
throw SysError("mounting /sys"); throw SysError("mounting /sys");
}
/* Mount a new tmpfs on /dev/shm to ensure that whatever /* Mount a new tmpfs on /dev/shm to ensure that whatever
the builder puts in /dev/shm is cleaned up automatically. */ the builder puts in /dev/shm is cleaned up automatically. */

2
src/libstore/user-lock.cc
View file

@ -122,7 +122,7 @@ struct CgroupUserLock : UserLock
return uid; return uid;
} }
std::vector<gid_t> getSupplementaryGIDs() override { return {}; } // FIXME std::vector<gid_t> getSupplementaryGIDs() override { return {}; }
static std::unique_ptr<UserLock> acquire() static std::unique_ptr<UserLock> acquire()
{ {