From 64a11f3dc20b45fdc8c058296b4f6449e4b9f24c Mon Sep 17 00:00:00 2001 From: Waiman Long Date: Tue, 10 Apr 2018 16:35:35 -0700 Subject: fs/proc/proc_sysctl.c: fix typo in sysctl_check_table_array() Patch series "ipc: Clamp *mni to the real IPCMNI limit", v3. The sysctl parameters msgmni, shmmni and semmni have an inherent limit of IPC_MNI (32k). However, users may not be aware of that because they can write a value much higher than that without getting any error or notification. Reading the parameters back will show the newly written values which are not real. Enforcing the limit by failing sysctl parameter write, however, can break existing user applications. To address this delemma, a new flags field is introduced into the ctl_table. The value CTL_FLAGS_CLAMP_RANGE can be added to any ctl_table entries to enable a looser range clamping without returning any error. For example, .flags = CTL_FLAGS_CLAMP_RANGE, This flags value are now used for the range checking of shmmni, msgmni and semmni without breaking existing applications. If any out of range value is written to those sysctl parameters, the following warning will be printed instead. Kernel parameter "shmmni" was set out of range [0, 32768], clamped to 32768. Reading the values back will show 32768 instead of some fake values. This patch (of 6): Fix a typo. Link: http://lkml.kernel.org/r/1519926220-7453-2-git-send-email-longman@redhat.com Signed-off-by: Waiman Long Reviewed-by: Andrew Morton Acked-by: Luis R. Rodriguez Cc: Davidlohr Bueso Cc: Manfred Spraul Cc: Kees Cook Cc: Al Viro Cc: Matthew Wilcox Cc: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/proc_sysctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index 4654fc3..8989936 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -1086,7 +1086,7 @@ static int sysctl_check_table_array(const char *path, struct ctl_table *table) if ((table->proc_handler == proc_douintvec) || (table->proc_handler == proc_douintvec_minmax)) { if (table->maxlen != sizeof(unsigned int)) - err |= sysctl_err(path, table, "array now allowed"); + err |= sysctl_err(path, table, "array not allowed"); } return err; -- cgit v1.1