From: Eric Biggers <ebiggers@xxxxxxxxxx>
Currently the registration of the fsverity sysctls happens in
signature.c, which couples it to CONFIG_FS_VERITY_BUILTIN_SIGNATURES.
This makes it hard to add new sysctls unrelated to builtin signatures.
Also, some users have started checking whether the directory
/proc/sys/fs/verity exists as a way to tell whether fsverity is
supported. This isn't the intended method; instead, the existence of
/sys/fs/$fstype/features/verity should be checked, or users should just
try to use the fsverity ioctls. Regardlesss, it should be made to work
as expected without a dependency on CONFIG_FS_VERITY_BUILTIN_SIGNATURES.
Therefore, move the sysctl registration into init.c. With
CONFIG_FS_VERITY_BUILTIN_SIGNATURES, nothing changes. Without it, but
with CONFIG_FS_VERITY, an empty list of sysctls is now registered.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
fs/verity/fsverity_private.h | 1 +
fs/verity/init.c | 32 ++++++++++++++++++++++++++++++++
fs/verity/signature.c | 33 +--------------------------------
3 files changed, 34 insertions(+), 32 deletions(-)
diff --git a/fs/verity/fsverity_private.h b/fs/verity/fsverity_private.h
index c5ab9023dd2d3..d071a6e32581e 100644
--- a/fs/verity/fsverity_private.h
+++ b/fs/verity/fsverity_private.h
@@ -123,6 +123,7 @@ void __init fsverity_init_info_cache(void);
/* signature.c */
#ifdef CONFIG_FS_VERITY_BUILTIN_SIGNATURES
+extern int fsverity_require_signatures;
int fsverity_verify_signature(const struct fsverity_info *vi,
const u8 *signature, size_t sig_size);
diff --git a/fs/verity/init.c b/fs/verity/init.c
index bcd11d63eb1ca..a29f062f6047b 100644
--- a/fs/verity/init.c
+++ b/fs/verity/init.c
@@ -9,6 +9,37 @@
#include <linux/ratelimit.h>
+#ifdef CONFIG_SYSCTL
+static struct ctl_table_header *fsverity_sysctl_header;
+
+static struct ctl_table fsverity_sysctl_table[] = {
+#ifdef CONFIG_FS_VERITY_BUILTIN_SIGNATURES
+ {
+ .procname = "require_signatures",
+ .data = &fsverity_require_signatures,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ },
+#endif
+ { }
+};
+
+static void __init fsverity_init_sysctl(void)
+{
+ fsverity_sysctl_header = register_sysctl("fs/verity",
+ fsverity_sysctl_table);
+ if (!fsverity_sysctl_header)
+ panic("fsverity sysctl registration failed");
+}
+#else /* CONFIG_SYSCTL */
+static inline void fsverity_init_sysctl(void)
+{
+}
+#endif /* !CONFIG_SYSCTL */
+
void fsverity_msg(const struct inode *inode, const char *level,
const char *fmt, ...)
{
@@ -36,6 +67,7 @@ static int __init fsverity_init(void)
fsverity_check_hash_algs();
fsverity_init_info_cache();
fsverity_init_workqueue();
+ fsverity_init_sysctl();
fsverity_init_signature();
return 0;
}
diff --git a/fs/verity/signature.c b/fs/verity/signature.c
index ec75ffec069ed..b95acae64eac6 100644
--- a/fs/verity/signature.c
+++ b/fs/verity/signature.c
@@ -24,7 +24,7 @@
* /proc/sys/fs/verity/require_signatures
* If 1, all verity files must have a valid builtin signature.
*/
-static int fsverity_require_signatures;
+int fsverity_require_signatures;
/*
* Keyring that contains the trusted X.509 certificates.
@@ -93,35 +93,6 @@ int fsverity_verify_signature(const struct fsverity_info *vi,
return 0;
}
-#ifdef CONFIG_SYSCTL
-static struct ctl_table_header *fsverity_sysctl_header;
-
-static struct ctl_table fsverity_sysctl_table[] = {
- {
- .procname = "require_signatures",
- .data = &fsverity_require_signatures,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- { }
-};
-
-static void __init fsverity_sysctl_init(void)
-{
- fsverity_sysctl_header = register_sysctl("fs/verity",
- fsverity_sysctl_table);
- if (!fsverity_sysctl_header)
- panic("fsverity sysctl registration failed");
-}
-#else /* !CONFIG_SYSCTL */
-static inline void fsverity_sysctl_init(void)
-{
-}
-#endif /* !CONFIG_SYSCTL */
-
void __init fsverity_init_signature(void)
{
fsverity_keyring =
@@ -132,6 +103,4 @@ void __init fsverity_init_signature(void)
KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
if (IS_ERR(fsverity_keyring))
panic("failed to allocate \".fs-verity\" keyring");
-
- fsverity_sysctl_init();
}
--
2.41.0
