summaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
authorThiago Rafael Becker <thiago.becker@gmail.com>2017-12-15 02:33:12 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-12-15 03:00:49 +0300
commitbdcf0a423ea1c40bbb40e7ee483b50fc8aa3d758 (patch)
tree942b1b8fa9b1e52503d5f9894d43674255813566 /arch
parent1f704fd0d14043e76e80f6b8b2251b9b2cedcca6 (diff)
downloadlinux-bdcf0a423ea1c40bbb40e7ee483b50fc8aa3d758.tar.xz
kernel: make groups_sort calling a responsibility group_info allocators
In testing, we found that nfsd threads may call set_groups in parallel for the same entry cached in auth.unix.gid, racing in the call of groups_sort, corrupting the groups for that entry and leading to permission denials for the client. This patch: - Make groups_sort globally visible. - Move the call to groups_sort to the modifiers of group_info - Remove the call to groups_sort from set_groups Link: http://lkml.kernel.org/r/20171211151420.18655-1-thiago.becker@gmail.com Signed-off-by: Thiago Rafael Becker <thiago.becker@gmail.com> Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com> Reviewed-by: NeilBrown <neilb@suse.com> Acked-by: "J. Bruce Fields" <bfields@fieldses.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kernel/compat_linux.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index f04db3779b34..59eea9c65d3e 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -263,6 +263,7 @@ COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplis
return retval;
}
+ groups_sort(group_info);
retval = set_current_groups(group_info);
put_group_info(group_info);