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IB/uverbs: Use get_unused_fd_flags(O_CLOEXEC) instead of get_unused_fd() 

The macro get_unused_fd() is used to allocate a file descriptor with
default flags.  Those default flags (0) can be "unsafe": O_CLOEXEC must
be used by default to not leak file descriptor across exec().

Replace calls to get_unused_fd() in uverbs with calls to
get_unused_fd_flags(O_CLOEXEC).  Inheriting uverbs fds across exec()
cannot be used to do anything useful.

Based on a patch/suggestion from Yann Droneaud <ydroneaud@opteya.com>.

Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Roland Dreier 2013-07-08 11:15:45 -07:00
parent 80b15043e3
commit da183c7af8
1 changed files with 2 additions and 2 deletions
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4
drivers/infiniband/core/uverbs_cmd.c
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@ -334,7 +334,7 @@ ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
resp.num_comp_vectors = file->device->num_comp_vectors;
ret = get_unused_fd();
ret = get_unused_fd_flags(O_CLOEXEC);
if (ret < 0)
goto err_free;
resp.async_fd = ret;
@ -1184,7 +1184,7 @@ ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
if (copy_from_user(&cmd, buf, sizeof cmd))
return -EFAULT;
ret = get_unused_fd();
ret = get_unused_fd_flags(O_CLOEXEC);
if (ret < 0)
return ret;
resp.fd = ret;