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authorAl Viro <viro@zeniv.linux.org.uk>2008-07-26 16:01:20 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2008-07-26 20:53:45 -0400
commit4e1e018ecc6f7bfd10fc75b3ff9715cc8164e0a2 (patch)
tree75404b1269b079a327551f76a9b3f941f5b11a77 /fs/file.c
parent6c5d0512a091480c9f981162227fdb1c9d70e555 (diff)
downloadlinux-4e1e018ecc6f7bfd10fc75b3ff9715cc8164e0a2.tar.bz2
[PATCH] fix RLIM_NOFILE handling
* dup2() should return -EBADF on exceeded sysctl_nr_open * dup() should *not* return -EINVAL even if you have rlimit set to 0; it should get -EMFILE instead. Check for orig_start exceeding rlimit taken to sys_fcntl(). Failing expand_files() in dup{2,3}() now gets -EMFILE remapped to -EBADF. Consequently, remaining checks for rlimit are taken to expand_files(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/file.c')
-rw-r--r--fs/file.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/file.c b/fs/file.c
index 7b3887e054d0..d8773b19fe47 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -250,9 +250,18 @@ int expand_files(struct files_struct *files, int nr)
struct fdtable *fdt;
fdt = files_fdtable(files);
+
+ /*
+ * N.B. For clone tasks sharing a files structure, this test
+ * will limit the total number of files that can be opened.
+ */
+ if (nr >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
+ return -EMFILE;
+
/* Do we need to expand? */
if (nr < fdt->max_fds)
return 0;
+
/* Can we expand? */
if (nr >= sysctl_nr_open)
return -EMFILE;