On Tue, Jul 21, 2026 at 11:37:27AM -0400, Dwayne B. Bent wrote:
Add a `bool` argument `config_idmaps` to `pasta_start_ns()` that guards the logic to configure user and group ID mappings. It is set to `false` when `netns_only` is `true`. Fixes bug 216.
Assisted-by: Codex:gpt-5.6-sol Signed-off-by: Dwayne B. Bent
Needs a Link: https://bugs.passt.top/show_bug.cgi?id=216 line. Otherwise looks fine to me.
--- conf.c | 2 +- pasta.c | 24 ++++++++++++++---------- pasta.h | 3 ++- 3 files changed, 17 insertions(+), 12 deletions(-)
diff --git a/conf.c b/conf.c index 0fcba5c..2223604 100644 --- a/conf.c +++ b/conf.c @@ -1945,7 +1945,7 @@ void conf(struct ctx *c, int argc, char **argv) if (*netns) { pasta_open_ns(c, netns); } else { - pasta_start_ns(c, uid, gid, + pasta_start_ns(c, uid, gid, !netns_only, argc - optind, argv + optind); } } diff --git a/pasta.c b/pasta.c index 4e7ee54..5aa56b7 100644 --- a/pasta.c +++ b/pasta.c @@ -236,10 +236,11 @@ static int pasta_spawn_cmd(void *arg) * @c: Execution context * @uid: UID we're running as in the init namespace * @gid: GID we're running as in the init namespace + * @config_idmaps: Whether to configure user mappings * @argc: Number of arguments for spawned command * @argv: Command to spawn and arguments */ -void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid, +void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid, bool config_idmaps, int argc, char *argv[]) { char ns_fn_stack[NS_FN_STACK_SIZE] @@ -249,7 +250,6 @@ void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid, .argv = argv, .c = c, }; - char uidmap[BUFSIZ], gidmap[BUFSIZ]; char *sh_argv[] = { NULL, NULL }; char sh_arg0[PATH_MAX + 1]; sigset_t set; @@ -259,16 +259,20 @@ void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid, c->quiet = 1;
/* Configure user and group mappings */ - if (snprintf_check(uidmap, BUFSIZ, "0 %u 1", uid)) - die_perror("Can't build uidmap"); + if (config_idmaps) { + char uidmap[BUFSIZ], gidmap[BUFSIZ];
- if (snprintf_check(gidmap, BUFSIZ, "0 %u 1", gid)) - die_perror("Can't build gidmap"); + if (snprintf_check(uidmap, BUFSIZ, "0 %u 1", uid)) + die_perror("Can't build uidmap");
- if (write_file("/proc/self/uid_map", uidmap) || - write_file("/proc/self/setgroups", "deny") || - write_file("/proc/self/gid_map", gidmap)) { - warn("Couldn't configure user mappings"); + if (snprintf_check(gidmap, BUFSIZ, "0 %u 1", gid)) + die_perror("Can't build gidmap"); + + if (write_file("/proc/self/uid_map", uidmap) || + write_file("/proc/self/setgroups", "deny") || + write_file("/proc/self/gid_map", gidmap)) { + warn("Couldn't configure user mappings"); + } }
if (argc == 0) { diff --git a/pasta.h b/pasta.h index 07e04b3..edd7747 100644 --- a/pasta.h +++ b/pasta.h @@ -6,12 +6,13 @@ #ifndef PASTA_H #define PASTA_H
+#include
#include extern int pasta_child_pid;
void pasta_open_ns(struct ctx *c, const char *netns); -void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid, +void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid, bool config_idmaps, int argc, char *argv[]); void pasta_ns_conf(struct ctx *c); void pasta_child_handler(int signal); -- 2.55.0
-- David Gibson (he or they) | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you, not the other way | around. http://www.ozlabs.org/~dgibson