Messages in this thread Patch in this message | | | From | "Eric W. Biederman" <> | Subject | [PATCH 4/4] sysctl: Fix sys_sysctl interface of ipc sysctls | Date | Sun, 26 Nov 2006 22:05:11 -0700 |
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Currently there is a regression and the ipc sysctls don't show up in the binary sysctl namespace.
This patch adds sysctl_ipc_data to read data/write from the appropriate namespace and deliver it in the expected manner.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> --- kernel/sysctl.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 638aa14..24c2ca8 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -142,6 +142,10 @@ static int sysctl_uts_string(ctl_table * void __user *oldval, size_t __user *oldlenp, void __user *newval, size_t newlen, void **context); +static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen, + void __user *oldval, size_t __user *oldlenp, + void __user *newval, size_t newlen, void **context); + #ifdef CONFIG_PROC_SYSCTL static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos); @@ -475,6 +479,7 @@ #ifdef CONFIG_SYSVIPC .maxlen = sizeof (init_ipc_ns.shm_ctlmax), .mode = 0644, .proc_handler = &proc_ipc_doulongvec_minmax, + .strategy = sysctl_ipc_data, }, { .ctl_name = KERN_SHMALL, @@ -483,6 +488,7 @@ #ifdef CONFIG_SYSVIPC .maxlen = sizeof (init_ipc_ns.shm_ctlall), .mode = 0644, .proc_handler = &proc_ipc_doulongvec_minmax, + .strategy = sysctl_ipc_data, }, { .ctl_name = KERN_SHMMNI, @@ -491,6 +497,7 @@ #ifdef CONFIG_SYSVIPC .maxlen = sizeof (init_ipc_ns.shm_ctlmni), .mode = 0644, .proc_handler = &proc_ipc_dointvec, + .strategy = sysctl_ipc_data, }, { .ctl_name = KERN_MSGMAX, @@ -499,6 +506,7 @@ #ifdef CONFIG_SYSVIPC .maxlen = sizeof (init_ipc_ns.msg_ctlmax), .mode = 0644, .proc_handler = &proc_ipc_dointvec, + .strategy = sysctl_ipc_data, }, { .ctl_name = KERN_MSGMNI, @@ -507,6 +515,7 @@ #ifdef CONFIG_SYSVIPC .maxlen = sizeof (init_ipc_ns.msg_ctlmni), .mode = 0644, .proc_handler = &proc_ipc_dointvec, + .strategy = sysctl_ipc_data, }, { .ctl_name = KERN_MSGMNB, @@ -515,6 +524,7 @@ #ifdef CONFIG_SYSVIPC .maxlen = sizeof (init_ipc_ns.msg_ctlmnb), .mode = 0644, .proc_handler = &proc_ipc_dointvec, + .strategy = sysctl_ipc_data, }, { .ctl_name = KERN_SEM, @@ -523,6 +533,7 @@ #ifdef CONFIG_SYSVIPC .maxlen = 4*sizeof (int), .mode = 0644, .proc_handler = &proc_ipc_dointvec, + .strategy = sysctl_ipc_data, }, #endif #ifdef CONFIG_MAGIC_SYSRQ @@ -2613,6 +2624,45 @@ static int sysctl_uts_string(ctl_table * return r; } +/* The generic sysctl ipc data routine. */ +static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen, + void __user *oldval, size_t __user *oldlenp, + void __user *newval, size_t newlen, void **context) +{ + size_t len; + void *data; + + /* Get out of I don't have a variable */ + if (!table->data || !table->maxlen) + return -ENOTDIR; + + data = get_ipc(table, 1); + if (!data) + return -ENOTDIR; + + if (oldval && oldlenp) { + if (get_user(len, oldlenp)) + return -EFAULT; + if (len) { + if (len > table->maxlen) + len = table->maxlen; + if (copy_to_user(oldval, data, len)) + return -EFAULT; + if (put_user(len, oldlenp)) + return -EFAULT; + } + } + + if (newval && newlen) { + if (newlen > table->maxlen) + newlen = table->maxlen; + + if (copy_from_user(data, newval, newlen)) + return -EFAULT; + } + return 1; +} + #else /* CONFIG_SYSCTL_SYSCALL */ -- 1.4.2.rc3.g7e18e-dirty - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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