6.6-stable review patch. If anyone has any objections, please let me know.
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From: Sahil Siddiq icegambit91@gmail.com
[ Upstream commit 478a535ae54ad3831371904d93b5dfc403222e17 ]
When pinning programs/objects under PATH (eg: during "bpftool prog loadall") the bpffs is mounted on the parent dir of PATH in the following situations: - the given dir exists but it is not bpffs. - the given dir doesn't exist and the parent dir is not bpffs.
Mounting on the parent dir can also have the unintentional side- effect of hiding other files located under the parent dir.
If the given dir exists but is not bpffs, then the bpffs should be mounted on the given dir and not its parent dir.
Similarly, if the given dir doesn't exist and its parent dir is not bpffs, then the given dir should be created and the bpffs should be mounted on this new dir.
Fixes: 2a36c26fe3b8 ("bpftool: Support bpffs mountpoint as pin path for prog loadall") Signed-off-by: Sahil Siddiq icegambit91@gmail.com Signed-off-by: Andrii Nakryiko andrii@kernel.org Link: https://lore.kernel.org/bpf/2da44d24-74ae-a564-1764-afccf395eeec@isovalent.c... Link: https://lore.kernel.org/bpf/20240404192219.52373-1-icegambit91@gmail.com
Closes: https://github.com/libbpf/bpftool/issues/100
Changes since v1: - Split "mount_bpffs_for_pin" into two functions. This is done to improve maintainability and readability.
Changes since v2: - mount_bpffs_for_pin: rename to "create_and_mount_bpffs_dir". - mount_bpffs_given_file: rename to "mount_bpffs_given_file". - create_and_mount_bpffs_dir: - introduce "dir_exists" boolean. - remove new dir if "mnt_fs" fails. - improve error handling and error messages.
Changes since v3: - Rectify function name. - Improve error messages and formatting. - mount_bpffs_for_file: - Check if dir exists before block_mount check.
Changes since v4: - Use strdup instead of strcpy. - create_and_mount_bpffs_dir: - Use S_IRWXU instead of 0700. - Improve error handling and formatting.
Signed-off-by: Sasha Levin sashal@kernel.org --- tools/bpf/bpftool/common.c | 96 +++++++++++++++++++++++++++++----- tools/bpf/bpftool/iter.c | 2 +- tools/bpf/bpftool/main.h | 3 +- tools/bpf/bpftool/prog.c | 5 +- tools/bpf/bpftool/struct_ops.c | 2 +- 5 files changed, 92 insertions(+), 16 deletions(-)
diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c index cc6e6aae2447d..958e92acca8e2 100644 --- a/tools/bpf/bpftool/common.c +++ b/tools/bpf/bpftool/common.c @@ -244,29 +244,101 @@ int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type) return fd; }
-int mount_bpffs_for_pin(const char *name, bool is_dir) +int create_and_mount_bpffs_dir(const char *dir_name) { char err_str[ERR_MAX_LEN]; - char *file; - char *dir; + bool dir_exists; int err = 0;
- if (is_dir && is_bpffs(name)) + if (is_bpffs(dir_name)) return err;
- file = malloc(strlen(name) + 1); - if (!file) { + dir_exists = access(dir_name, F_OK) == 0; + + if (!dir_exists) { + char *temp_name; + char *parent_name; + + temp_name = strdup(dir_name); + if (!temp_name) { + p_err("mem alloc failed"); + return -1; + } + + parent_name = dirname(temp_name); + + if (is_bpffs(parent_name)) { + /* nothing to do if already mounted */ + free(temp_name); + return err; + } + + if (access(parent_name, F_OK) == -1) { + p_err("can't create dir '%s' to pin BPF object: parent dir '%s' doesn't exist", + dir_name, parent_name); + free(temp_name); + return -1; + } + + free(temp_name); + } + + if (block_mount) { + p_err("no BPF file system found, not mounting it due to --nomount option"); + return -1; + } + + if (!dir_exists) { + err = mkdir(dir_name, S_IRWXU); + if (err) { + p_err("failed to create dir '%s': %s", dir_name, strerror(errno)); + return err; + } + } + + err = mnt_fs(dir_name, "bpf", err_str, ERR_MAX_LEN); + if (err) { + err_str[ERR_MAX_LEN - 1] = '\0'; + p_err("can't mount BPF file system on given dir '%s': %s", + dir_name, err_str); + + if (!dir_exists) + rmdir(dir_name); + } + + return err; +} + +int mount_bpffs_for_file(const char *file_name) +{ + char err_str[ERR_MAX_LEN]; + char *temp_name; + char *dir; + int err = 0; + + if (access(file_name, F_OK) != -1) { + p_err("can't pin BPF object: path '%s' already exists", file_name); + return -1; + } + + temp_name = strdup(file_name); + if (!temp_name) { p_err("mem alloc failed"); return -1; }
- strcpy(file, name); - dir = dirname(file); + dir = dirname(temp_name);
if (is_bpffs(dir)) /* nothing to do if already mounted */ goto out_free;
+ if (access(dir, F_OK) == -1) { + p_err("can't pin BPF object: dir '%s' doesn't exist", dir); + err = -1; + goto out_free; + } + if (block_mount) { p_err("no BPF file system found, not mounting it due to --nomount option"); err = -1; @@ -276,12 +348,12 @@ int mount_bpffs_for_pin(const char *name, bool is_dir) err = mnt_fs(dir, "bpf", err_str, ERR_MAX_LEN); if (err) { err_str[ERR_MAX_LEN - 1] = '\0'; - p_err("can't mount BPF file system to pin the object (%s): %s", - name, err_str); + p_err("can't mount BPF file system to pin the object '%s': %s", + file_name, err_str); }
out_free: - free(file); + free(temp_name); return err; }
@@ -289,7 +361,7 @@ int do_pin_fd(int fd, const char *name) { int err;
- err = mount_bpffs_for_pin(name, false); + err = mount_bpffs_for_file(name); if (err) return err;
diff --git a/tools/bpf/bpftool/iter.c b/tools/bpf/bpftool/iter.c index 6b0e5202ca7a9..5c39c2ed36a2b 100644 --- a/tools/bpf/bpftool/iter.c +++ b/tools/bpf/bpftool/iter.c @@ -76,7 +76,7 @@ static int do_pin(int argc, char **argv) goto close_obj; }
- err = mount_bpffs_for_pin(path, false); + err = mount_bpffs_for_file(path); if (err) goto close_link;
diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h index b8bb08d10dec9..9eb764fe4cc8b 100644 --- a/tools/bpf/bpftool/main.h +++ b/tools/bpf/bpftool/main.h @@ -142,7 +142,8 @@ const char *get_fd_type_name(enum bpf_obj_type type); char *get_fdinfo(int fd, const char *key); int open_obj_pinned(const char *path, bool quiet); int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type); -int mount_bpffs_for_pin(const char *name, bool is_dir); +int mount_bpffs_for_file(const char *file_name); +int create_and_mount_bpffs_dir(const char *dir_name); int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(int *, char ***)); int do_pin_fd(int fd, const char *name);
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c index f186f1cee465b..086b93939ce93 100644 --- a/tools/bpf/bpftool/prog.c +++ b/tools/bpf/bpftool/prog.c @@ -1774,7 +1774,10 @@ static int load_with_options(int argc, char **argv, bool first_prog_only) goto err_close_obj; }
- err = mount_bpffs_for_pin(pinfile, !first_prog_only); + if (first_prog_only) + err = mount_bpffs_for_file(pinfile); + else + err = create_and_mount_bpffs_dir(pinfile); if (err) goto err_close_obj;
diff --git a/tools/bpf/bpftool/struct_ops.c b/tools/bpf/bpftool/struct_ops.c index 3ebc9fe91e0e1..d110c6ad8175c 100644 --- a/tools/bpf/bpftool/struct_ops.c +++ b/tools/bpf/bpftool/struct_ops.c @@ -509,7 +509,7 @@ static int do_register(int argc, char **argv) if (argc == 1) linkdir = GET_ARG();
- if (linkdir && mount_bpffs_for_pin(linkdir, true)) { + if (linkdir && create_and_mount_bpffs_dir(linkdir)) { p_err("can't mount bpffs for pinning"); return -1; }