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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-11-01 14:27:38 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-11-01 14:27:38 -0300 |
commit | 1eae9639aac0f8de4d284f567ec722a822b52513 (patch) | |
tree | 34e45a5c5e6a1033a444bea952ba9199e57f3a19 /fs/posix_acl.c | |
parent | 037d32aa8f748e39844d2a5b607fb063b4583843 (diff) |
Linux-libre 4.8.6-gnupck-4.8.6-gnu
Diffstat (limited to 'fs/posix_acl.c')
-rw-r--r-- | fs/posix_acl.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/fs/posix_acl.c b/fs/posix_acl.c index 59d47ab07..bfc3ec388 100644 --- a/fs/posix_acl.c +++ b/fs/posix_acl.c @@ -626,6 +626,37 @@ no_mem: } EXPORT_SYMBOL_GPL(posix_acl_create); +/** + * posix_acl_update_mode - update mode in set_acl + * + * Update the file mode when setting an ACL: compute the new file permission + * bits based on the ACL. In addition, if the ACL is equivalent to the new + * file mode, set *acl to NULL to indicate that no ACL should be set. + * + * As with chmod, clear the setgit bit if the caller is not in the owning group + * or capable of CAP_FSETID (see inode_change_ok). + * + * Called from set_acl inode operations. + */ +int posix_acl_update_mode(struct inode *inode, umode_t *mode_p, + struct posix_acl **acl) +{ + umode_t mode = inode->i_mode; + int error; + + error = posix_acl_equiv_mode(*acl, &mode); + if (error < 0) + return error; + if (error == 0) + *acl = NULL; + if (!in_group_p(inode->i_gid) && + !capable_wrt_inode_uidgid(inode, CAP_FSETID)) + mode &= ~S_ISGID; + *mode_p = mode; + return 0; +} +EXPORT_SYMBOL(posix_acl_update_mode); + /* * Fix up the uids and gids in posix acl extended attributes in place. */ |