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lsm: constify 'sb' parameter in security_sb_kern_mount()

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The "sb_kern_mount" hook has implementation registered in SELinux.
Looking at the function implementation we observe that the "sb"
parameter is not changing.

Mark the "sb" parameter of LSM hook security_sb_kern_mount() as "const"
since it will not be changing in the LSM hook.

Signed-off-by: Khadija Kamran <kamrankhadijadj@gmail.com>
[PM: minor merge fuzzing due to other constification patches]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Khadija Kamran 2023-08-23 14:01:28 +05:00 committed by Paul Moore
parent a721f7b8c3
commit 20a2aa4709
4 changed files with 4 additions and 4 deletions
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2
include/linux/lsm_hook_defs.h
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@ -66,7 +66,7 @@ LSM_HOOK(void, LSM_RET_VOID, sb_free_mnt_opts, void *mnt_opts)
LSM_HOOK(int, 0, sb_eat_lsm_opts, char *orig, void **mnt_opts)
LSM_HOOK(int, 0, sb_mnt_opts_compat, struct super_block *sb, void *mnt_opts)
LSM_HOOK(int, 0, sb_remount, struct super_block *sb, void *mnt_opts)
LSM_HOOK(int, 0, sb_kern_mount, struct super_block *sb)
LSM_HOOK(int, 0, sb_kern_mount, const struct super_block *sb)
LSM_HOOK(int, 0, sb_show_options, struct seq_file *m, struct super_block *sb)
LSM_HOOK(int, 0, sb_statfs, struct dentry *dentry)
LSM_HOOK(int, 0, sb_mount, const char *dev_name, const struct path *path,

2
include/linux/security.h
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@ -304,7 +304,7 @@ void security_free_mnt_opts(void **mnt_opts);
int security_sb_eat_lsm_opts(char *options, void **mnt_opts);
int security_sb_mnt_opts_compat(struct super_block *sb, void *mnt_opts);
int security_sb_remount(struct super_block *sb, void *mnt_opts);
int security_sb_kern_mount(struct super_block *sb);
int security_sb_kern_mount(const struct super_block *sb);
int security_sb_show_options(struct seq_file *m, struct super_block *sb);
int security_sb_statfs(struct dentry *dentry);
int security_sb_mount(const char *dev_name, const struct path *path,

2
security/security.c
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@ -1319,7 +1319,7 @@ EXPORT_SYMBOL(security_sb_remount);
*
* Return: Returns 0 if permission is granted.
*/
int security_sb_kern_mount(struct super_block *sb)
int security_sb_kern_mount(const struct super_block *sb)
{
return call_int_hook(sb_kern_mount, 0, sb);
}

2
security/selinux/hooks.c
View File

@ -2721,7 +2721,7 @@ static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
return -EINVAL;
}
static int selinux_sb_kern_mount(struct super_block *sb)
static int selinux_sb_kern_mount(const struct super_block *sb)
{
const struct cred *cred = current_cred();
struct common_audit_data ad;