Skip to content

Commit

Permalink
samples/landlock: Format with clang-format
Browse files Browse the repository at this point in the history 
commit 81709f3 upstream.

Let's follow a consistent and documented coding style.  Everything may
not be to our liking but it is better than tacit knowledge.  Moreover,
this will help maintain style consistency between different developers.

This contains only whitespace changes.

Automatically formatted with:
clang-format-14 -i samples/landlock/*.[ch]

Link: https://lore.kernel.org/r/20220506160513.523257-8-mic@digikod.net
Cc: stable@vger.kernel.org
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  • Loading branch information
@l0kod @gregkh
l0kod authored and gregkh committed Jun 9, 2022
1 parent ace6246 commit ef35061
Showing 1 changed file with 52 additions and 44 deletions.
96 changes: 52 additions & 44 deletions samples/landlock/sandboxer.c
View file
Expand Up @@ -22,27 +22,28 @@
#include <unistd.h>

#ifndef landlock_create_ruleset
static inline int landlock_create_ruleset(
const struct landlock_ruleset_attr *const attr,
const size_t size, const __u32 flags)
static inline int
landlock_create_ruleset(const struct landlock_ruleset_attr *const attr,
const size_t size, const __u32 flags)
{
return syscall(__NR_landlock_create_ruleset, attr, size, flags);
}
#endif

#ifndef landlock_add_rule
static inline int landlock_add_rule(const int ruleset_fd,
const enum landlock_rule_type rule_type,
const void *const rule_attr, const __u32 flags)
const enum landlock_rule_type rule_type,
const void *const rule_attr,
const __u32 flags)
{
return syscall(__NR_landlock_add_rule, ruleset_fd, rule_type,
rule_attr, flags);
return syscall(__NR_landlock_add_rule, ruleset_fd, rule_type, rule_attr,
flags);
}
#endif

#ifndef landlock_restrict_self
static inline int landlock_restrict_self(const int ruleset_fd,
const __u32 flags)
const __u32 flags)
{
return syscall(__NR_landlock_restrict_self, ruleset_fd, flags);
}
Expand Down Expand Up @@ -79,9 +80,8 @@ static int parse_path(char *env_path, const char ***const path_list)

/* clang-format on */

static int populate_ruleset(
const char *const env_var, const int ruleset_fd,
const __u64 allowed_access)
static int populate_ruleset(const char *const env_var, const int ruleset_fd,
const __u64 allowed_access)
{
int num_paths, i, ret = 1;
char *env_path_name;
Expand Down Expand Up @@ -111,12 +111,10 @@ static int populate_ruleset(
for (i = 0; i < num_paths; i++) {
struct stat statbuf;

path_beneath.parent_fd = open(path_list[i], O_PATH |
O_CLOEXEC);
path_beneath.parent_fd = open(path_list[i], O_PATH | O_CLOEXEC);
if (path_beneath.parent_fd < 0) {
fprintf(stderr, "Failed to open \"%s\": %s\n",
path_list[i],
strerror(errno));
path_list[i], strerror(errno));
goto out_free_name;
}
if (fstat(path_beneath.parent_fd, &statbuf)) {
Expand All @@ -127,9 +125,10 @@ static int populate_ruleset(
if (!S_ISDIR(statbuf.st_mode))
path_beneath.allowed_access &= ACCESS_FILE;
if (landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH,
&path_beneath, 0)) {
fprintf(stderr, "Failed to update the ruleset with \"%s\": %s\n",
path_list[i], strerror(errno));
&path_beneath, 0)) {
fprintf(stderr,
"Failed to update the ruleset with \"%s\": %s\n",
path_list[i], strerror(errno));
close(path_beneath.parent_fd);
goto out_free_name;
}
Expand Down Expand Up @@ -171,55 +170,64 @@ int main(const int argc, char *const argv[], char *const *const envp)
int ruleset_fd;
struct landlock_ruleset_attr ruleset_attr = {
.handled_access_fs = ACCESS_FS_ROUGHLY_READ |
ACCESS_FS_ROUGHLY_WRITE,
ACCESS_FS_ROUGHLY_WRITE,
};

if (argc < 2) {
fprintf(stderr, "usage: %s=\"...\" %s=\"...\" %s <cmd> [args]...\n\n",
ENV_FS_RO_NAME, ENV_FS_RW_NAME, argv[0]);
fprintf(stderr, "Launch a command in a restricted environment.\n\n");
fprintf(stderr,
"usage: %s=\"...\" %s=\"...\" %s <cmd> [args]...\n\n",
ENV_FS_RO_NAME, ENV_FS_RW_NAME, argv[0]);
fprintf(stderr,
"Launch a command in a restricted environment.\n\n");
fprintf(stderr, "Environment variables containing paths, "
"each separated by a colon:\n");
fprintf(stderr, "* %s: list of paths allowed to be used in a read-only way.\n",
ENV_FS_RO_NAME);
fprintf(stderr, "* %s: list of paths allowed to be used in a read-write way.\n",
ENV_FS_RW_NAME);
fprintf(stderr, "\nexample:\n"
"%s=\"/bin:/lib:/usr:/proc:/etc:/dev/urandom\" "
"%s=\"/dev/null:/dev/full:/dev/zero:/dev/pts:/tmp\" "
"%s bash -i\n",
ENV_FS_RO_NAME, ENV_FS_RW_NAME, argv[0]);
fprintf(stderr,
"* %s: list of paths allowed to be used in a read-only way.\n",
ENV_FS_RO_NAME);
fprintf(stderr,
"* %s: list of paths allowed to be used in a read-write way.\n",
ENV_FS_RW_NAME);
fprintf(stderr,
"\nexample:\n"
"%s=\"/bin:/lib:/usr:/proc:/etc:/dev/urandom\" "
"%s=\"/dev/null:/dev/full:/dev/zero:/dev/pts:/tmp\" "
"%s bash -i\n",
ENV_FS_RO_NAME, ENV_FS_RW_NAME, argv[0]);
return 1;
}

ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
ruleset_fd =
landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
if (ruleset_fd < 0) {
const int err = errno;

perror("Failed to create a ruleset");
switch (err) {
case ENOSYS:
fprintf(stderr, "Hint: Landlock is not supported by the current kernel. "
"To support it, build the kernel with "
"CONFIG_SECURITY_LANDLOCK=y and prepend "
"\"landlock,\" to the content of CONFIG_LSM.\n");
fprintf(stderr,
"Hint: Landlock is not supported by the current kernel. "
"To support it, build the kernel with "
"CONFIG_SECURITY_LANDLOCK=y and prepend "
"\"landlock,\" to the content of CONFIG_LSM.\n");
break;
case EOPNOTSUPP:
fprintf(stderr, "Hint: Landlock is currently disabled. "
"It can be enabled in the kernel configuration by "
"prepending \"landlock,\" to the content of CONFIG_LSM, "
"or at boot time by setting the same content to the "
"\"lsm\" kernel parameter.\n");
fprintf(stderr,
"Hint: Landlock is currently disabled. "
"It can be enabled in the kernel configuration by "
"prepending \"landlock,\" to the content of CONFIG_LSM, "
"or at boot time by setting the same content to the "
"\"lsm\" kernel parameter.\n");
break;
}
return 1;
}
if (populate_ruleset(ENV_FS_RO_NAME, ruleset_fd,
ACCESS_FS_ROUGHLY_READ)) {
ACCESS_FS_ROUGHLY_READ)) {
goto err_close_ruleset;
}
if (populate_ruleset(ENV_FS_RW_NAME, ruleset_fd,
ACCESS_FS_ROUGHLY_READ | ACCESS_FS_ROUGHLY_WRITE)) {
ACCESS_FS_ROUGHLY_READ |
ACCESS_FS_ROUGHLY_WRITE)) {
goto err_close_ruleset;
}
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
Expand All @@ -236,7 +244,7 @@ int main(const int argc, char *const argv[], char *const *const envp)
cmd_argv = argv + 1;
execvpe(cmd_path, cmd_argv, envp);
fprintf(stderr, "Failed to execute \"%s\": %s\n", cmd_path,
strerror(errno));
strerror(errno));
fprintf(stderr, "Hint: access to the binary, the interpreter or "
"shared libraries may be denied.\n");
return 1;
Expand Down

0 comments on commit ef35061

Please sign in to comment.