Messages in this thread Patch in this message | | | From | Hengqi Chen <> | Subject | [PATCH v3 1/3] seccomp: Introduce SECCOMP_LOAD_FILTER operation | Date | Wed, 29 Nov 2023 05:34:38 +0000 |
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This patch adds a new operation named SECCOMP_LOAD_FILTER. It accepts a sock_fprog the same as SECCOMP_SET_MODE_FILTER but only performs the loading process. If succeed, returns a new fd associated with the seccomp filter. The seccomp filter thus can be reused to attach to different processes.
Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com> --- include/uapi/linux/seccomp.h | 1 + kernel/seccomp.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+)
diff --git a/include/uapi/linux/seccomp.h b/include/uapi/linux/seccomp.h index dbfc9b37fcae..ee2c83697810 100644 --- a/include/uapi/linux/seccomp.h +++ b/include/uapi/linux/seccomp.h @@ -16,6 +16,7 @@ #define SECCOMP_SET_MODE_FILTER 1 #define SECCOMP_GET_ACTION_AVAIL 2 #define SECCOMP_GET_NOTIF_SIZES 3 +#define SECCOMP_LOAD_FILTER 4 /* Valid flags for SECCOMP_SET_MODE_FILTER */ #define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0) diff --git a/kernel/seccomp.c b/kernel/seccomp.c index 255999ba9190..ef956c3d15c7 100644 --- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -1885,6 +1885,18 @@ static bool has_duplicate_listener(struct seccomp_filter *new_child) return false; } +static int seccomp_filter_put(struct inode *inode, struct file *file) +{ + struct seccomp_filter *filter = file->private_data; + + __put_seccomp_filter(filter); + return 0; +} + +static const struct file_operations seccomp_filter_fops = { + .release = seccomp_filter_put, +}; + /** * seccomp_set_mode_filter: internal function for setting seccomp filter * @flags: flags to change filter behavior @@ -1996,12 +2008,29 @@ static long seccomp_set_mode_filter(unsigned int flags, seccomp_filter_free(prepared); return ret; } + +static long seccomp_load_filter(const char __user *filter) +{ + struct seccomp_filter *sfilter; + + sfilter = seccomp_prepare_user_filter(filter); + if (IS_ERR(sfilter)) + return PTR_ERR(sfilter); + + return anon_inode_getfd("seccomp-filter", &seccomp_filter_fops, + sfilter, O_CLOEXEC); +} #else static inline long seccomp_set_mode_filter(unsigned int flags, const char __user *filter) { return -EINVAL; } + +static inline long seccomp_load_filter(const char __user *filter) +{ + return -EINVAL; +} #endif static long seccomp_get_action_avail(const char __user *uaction) @@ -2063,6 +2092,11 @@ static long do_seccomp(unsigned int op, unsigned int flags, return -EINVAL; return seccomp_get_notif_sizes(uargs); + case SECCOMP_LOAD_FILTER: + if (flags != 0) + return -EINVAL; + + return seccomp_load_filter(uargs); default: return -EINVAL; } -- 2.34.1
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