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| author | Al Viro <viro@zeniv.linux.org.uk> | 2008-05-10 10:08:32 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-05-16 17:22:52 -0400 |
| commit | eceea0b3df05ed262ae32e0c6340cc7a3626632d (patch) | |
| tree | 73e5e33acace9187d5729a9a8c8ff53c3d720d52 /fs/file.c | |
| parent | adbecb128cd2cc5d14b0ebef6d020ced0efd0ec6 (diff) | |
| download | lwn-eceea0b3df05ed262ae32e0c6340cc7a3626632d.tar.gz lwn-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 'fs/file.c')
| -rw-r--r-- | fs/file.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/file.c b/fs/file.c index 0f705c7cfefe..7b3887e054d0 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 = { |