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namespace: replace one case of stack allocation with heap allocation

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The list of mounts might grow quite large, let's avoid the stack for
this. Better safe than sorry.
This commit is contained in:
Lennart Poettering 2019-03-25 16:34:48 +01:00
parent 60a3e982f4
commit 5f7a690aaa
1 changed files with 13 additions and 4 deletions
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17
src/core/namespace.c
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@ -1182,7 +1182,7 @@ int setup_namespace(
_cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
_cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
_cleanup_free_ void *root_hash = NULL;
MountEntry *m, *mounts = NULL;
MountEntry *m = NULL, *mounts = NULL;
size_t n_mounts, root_hash_size = 0;
bool require_prefix = false;
const char *root;
@ -1246,7 +1246,10 @@ int setup_namespace(
protect_home, protect_system);
if (n_mounts > 0) {
m = mounts = (MountEntry *) alloca0(n_mounts * sizeof(MountEntry));
m = mounts = new0(MountEntry, n_mounts);
if (!mounts)
return -ENOMEM;
r = append_access_mounts(&m, read_write_paths, READWRITE, require_prefix);
if (r < 0)
goto finish;
@ -1417,7 +1420,7 @@ int setup_namespace(
if (n_mounts > 0) {
_cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
char **blacklist;
_cleanup_free_ char **blacklist = NULL;
size_t j;
/* Open /proc/self/mountinfo now as it may become unavailable if we mount anything on top of /proc.
@ -1463,7 +1466,11 @@ int setup_namespace(
}
/* Create a blacklist we can pass to bind_mount_recursive() */
blacklist = newa(char*, n_mounts+1);
blacklist = new(char*, n_mounts+1);
if (!blacklist) {
r = -ENOMEM;
goto finish;
}
for (j = 0; j < n_mounts; j++)
blacklist[j] = (char*) mount_entry_path(mounts+j);
blacklist[j] = NULL;
@ -1497,6 +1504,8 @@ finish:
for (m = mounts; m < mounts + n_mounts; m++)
mount_entry_done(m);
free(mounts);
return r;
}