From eceea0b3df05ed262ae32e0c6340cc7a3626632d Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 10 May 2008 10:08:32 -0400 Subject: [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 --- fs/file.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/file.c') diff --git a/fs/file.c b/fs/file.c index 0f705c7cfef..7b3887e054d 100644 --- a/fs/file.c +++ b/fs/file.c @@ -26,6 +26,8 @@ struct fdtable_defer { }; int sysctl_nr_open __read_mostly = 1024*1024; +int sysctl_nr_open_min = BITS_PER_LONG; +int sysctl_nr_open_max = 1024 * 1024; /* raised later */ /* * We use this list to defer free fdtables that have vmalloced @@ -405,6 +407,8 @@ void __init files_defer_init(void) int i; for_each_possible_cpu(i) fdtable_defer_list_init(i); + sysctl_nr_open_max = min((size_t)INT_MAX, ~(size_t)0/sizeof(void *)) & + -BITS_PER_LONG; } struct files_struct init_files = { -- cgit v1.2.3