From: Thomas Weißschuh linux@weissschuh.net

stable inclusion from stable-v5.10.223 commit b2591c89a6e2858796111138c38fcb6851aa1955 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAKQ93 CVE: CVE-2024-42312

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=t...

--------------------------------

[ Upstream commit 98ca62ba9e2be5863c7d069f84f7166b45a5b2f4 ]

Always initialize i_uid/i_gid inside the sysfs core so set_ownership() can safely skip setting them.

Commit 5ec27ec735ba ("fs/proc/proc_sysctl.c: fix the default values of i_uid/i_gid on /proc/sys inodes.") added defaults for i_uid/i_gid when set_ownership() was not implemented. It also missed adjusting net_ctl_set_ownership() to use the same default values in case the computation of a better value failed.

Fixes: 5ec27ec735ba ("fs/proc/proc_sysctl.c: fix the default values of i_uid/i_gid on /proc/sys inodes.") Cc: stable@vger.kernel.org Signed-off-by: Thomas Weißschuh linux@weissschuh.net Signed-off-by: Joel Granados j.granados@samsung.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Long Li leo.lilong@huawei.com --- fs/proc/proc_sysctl.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index c95f32b83a94..f4b1f78ead2e 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -496,12 +496,10 @@ static struct inode *proc_sys_make_inode(struct super_block *sb, make_empty_dir_inode(inode); }

+ inode->i_uid = GLOBAL_ROOT_UID; + inode->i_gid = GLOBAL_ROOT_GID; if (root->set_ownership) root->set_ownership(head, table, &inode->i_uid, &inode->i_gid); - else { - inode->i_uid = GLOBAL_ROOT_UID; - inode->i_gid = GLOBAL_ROOT_GID; - }

return inode; }