Commit-ID: 143cf23df25b7082cd706c3c53188e741e7881c3
Gitweb: http://git.kernel.org/tip/143cf23df25b7082cd706c3c53188e741e7881c3
Author: Michael Kerrisk <[email protected]>
AuthorDate: Fri, 9 May 2014 16:54:15 +0200
Committer: Ingo Molnar <[email protected]>
CommitDate: Thu, 22 May 2014 10:21:25 +0200
sched: Make sched_setattr() correctly return -EFBIG
The documented[1] behavior of sched_attr() in the proposed man page text is:
sched_attr::size must be set to the size of the structure, as in
sizeof(struct sched_attr), if the provided structure is smaller
than the kernel structure, any additional fields are assumed
'0'. If the provided structure is larger than the kernel structure,
the kernel verifies all additional fields are '0' if not the
syscall will fail with -E2BIG.
As currently implemented, sched_copy_attr() returns -EFBIG for
for this case, but the logic in sys_sched_setattr() converts that
error to -EFAULT. This patch fixes the behavior.
[1] http://thread.gmane.org/gmane.linux.kernel/1615615/focus=1697760
Signed-off-by: Michael Kerrisk <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
---
kernel/sched/core.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 13584f1..f2205f0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3658,8 +3658,9 @@ SYSCALL_DEFINE3(sched_setattr, pid_t, pid, struct
sched_attr __user *, uattr,
if (!uattr || pid < 0 || flags)
return -EINVAL;
- if (sched_copy_attr(uattr, &attr))
- return -EFAULT;
+ retval = sched_copy_attr(uattr, &attr);
+ if (retval)
+ return retval;
rcu_read_lock();
retval = -ESRCH;
--
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