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fix(bwrap): honor namespace fd 0 #731

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Merged
smcv merged 2 commits into from
Mar 20, 2026
+4 −4
Merged

fix(bwrap): honor namespace fd 0 #731

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4759f61
fix(bwrap): honor namespace fd 0
danielchristiancazares Feb 23, 2026
a792f53
Merge branch 'main' into fix/namespace-fd-zero-handling
danielchristiancazares Mar 20, 2026
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8 changes: 4 additions & 4 deletions bubblewrap.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3112,7 +3112,7 @@ main (int argc,
}

/* Switch to the custom user ns before the clone, gets us privs in that ns (assuming its a child of the current and thus allowed) */
if (opt_userns_fd > 0 && setns (opt_userns_fd, CLONE_NEWUSER) != 0)
if (opt_userns_fd != -1 && setns (opt_userns_fd, CLONE_NEWUSER) != 0)
{
if (errno == EINVAL)
die ("Joining the specified user namespace failed, it might not be a descendant of the current user namespace.");
Expand Down Expand Up @@ -3178,7 +3178,7 @@ main (int argc,

/* Initial launched process, wait for pid 1 or exec:ed command to exit */

if (opt_userns2_fd > 0 && setns (opt_userns2_fd, CLONE_NEWUSER) != 0)
if (opt_userns2_fd != -1 && setns (opt_userns2_fd, CLONE_NEWUSER) != 0)
die_with_error ("Setting userns2 failed");

/* We don't need any privileges in the launcher, drop them immediately. */
Expand Down Expand Up @@ -3219,7 +3219,7 @@ main (int argc,
return monitor_child (event_fd, pid, setup_finished_pipe[0]);
}

if (opt_pidns_fd > 0)
if (opt_pidns_fd != -1)
{
if (setns (opt_pidns_fd, CLONE_NEWPID) != 0)
die_with_error ("Setting pidns failed");
Expand Down Expand Up @@ -3446,7 +3446,7 @@ main (int argc,
die_with_error ("chdir /");
}

if (opt_userns2_fd > 0 && setns (opt_userns2_fd, CLONE_NEWUSER) != 0)
if (opt_userns2_fd != -1 && setns (opt_userns2_fd, CLONE_NEWUSER) != 0)
die_with_error ("Setting userns2 failed");

if (opt_unshare_user && opt_userns_block_fd == -1 &&
Expand Down