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authorAl Viro <viro@zeniv.linux.org.uk>2008-05-10 16:08:32 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2008-05-16 23:22:52 +0200
commiteceea0b3df05ed262ae32e0c6340cc7a3626632d (patch)
tree73e5e33acace9187d5729a9a8c8ff53c3d720d52 /kernel
parent[PATCH] dup_fd() part 4 - race fix (diff)
downloadlinux-eceea0b3df05ed262ae32e0c6340cc7a3626632d.tar.xz
linux-eceea0b3df05ed262ae32e0c6340cc7a3626632d.zip
[PATCH] avoid multiplication overflows and signedness issues for max_fds
Limit sysctl_nr_open - we don't want ->max_fds to exceed MAX_INT and we don't want size calculation for ->fd[] to overflow. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sysctl.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index d7ffdc59816a..29116652dca8 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -81,6 +81,7 @@ extern int compat_log;
extern int maps_protect;
extern int sysctl_stat_interval;
extern int latencytop_enabled;
+extern int sysctl_nr_open_min, sysctl_nr_open_max;
/* Constants used for minimum and maximum */
#if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
@@ -1190,7 +1191,9 @@ static struct ctl_table fs_table[] = {
.data = &sysctl_nr_open,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = &proc_dointvec_minmax,
+ .extra1 = &sysctl_nr_open_min,
+ .extra2 = &sysctl_nr_open_max,
},
{
.ctl_name = FS_DENTRY,