lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <alpine.DEB.2.02.1605242248350.5924@leontynka> Date: Tue, 24 May 2016 22:49:18 +0200 (CEST) From: Mikulas Patocka <mikulas@...bright.com> To: Linus Torvalds <torvalds@...ux-foundation.org> cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: [PATCH 3/3] hpfs: implement the show_options method The HPFS filesystem used generic_show_options to produce string that is displayed in /proc/mounts. However, there is problem that the options may disappear after remount. If we mount the filesystem with option1 and then remount it with option2, /proc/mounts should show both option1 and option2, however it only shows option2 because the whole option string is replaced with replace_mount_options in hpfs_remount_fs. To fix this bug, implement the hpfs_show_options function that prints options that are currently selected. Signed-off-by: Mikulas Patocka <mpatocka@...hat.com> Cc: stable@...r.kernel.org --- fs/hpfs/super.c | 43 ++++++++++++++++++++++++++++++++----------- 1 file changed, 32 insertions(+), 11 deletions(-) Index: linux-4.6/fs/hpfs/super.c =================================================================== --- linux-4.6.orig/fs/hpfs/super.c 2016-05-23 19:02:35.000000000 +0200 +++ linux-4.6/fs/hpfs/super.c 2016-05-23 19:18:22.000000000 +0200 @@ -15,6 +15,7 @@ #include <linux/sched.h> #include <linux/bitmap.h> #include <linux/slab.h> +#include <linux/seq_file.h> /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ @@ -455,10 +456,6 @@ static int hpfs_remount_fs(struct super_ int lowercase, eas, chk, errs, chkdsk, timeshift; int o; struct hpfs_sb_info *sbi = hpfs_sb(s); - char *new_opts = kstrdup(data, GFP_KERNEL); - - if (data && !new_opts) - return -ENOMEM; sync_filesystem(s); @@ -495,18 +492,44 @@ static int hpfs_remount_fs(struct super_ if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); - if (new_opts) - replace_mount_options(s, new_opts); - hpfs_unlock(s); return 0; out_err: hpfs_unlock(s); - kfree(new_opts); return -EINVAL; } +static int hpfs_show_options(struct seq_file *seq, struct dentry *root) +{ + struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb); + + seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid)); + seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid)); + seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777)); + if (sbi->sb_lowercase) + seq_printf(seq, ",case=lower"); + if (!sbi->sb_chk) + seq_printf(seq, ",check=none"); + if (sbi->sb_chk == 2) + seq_printf(seq, ",check=strict"); + if (!sbi->sb_err) + seq_printf(seq, ",errors=continue"); + if (sbi->sb_err == 2) + seq_printf(seq, ",errors=panic"); + if (!sbi->sb_chkdsk) + seq_printf(seq, ",chkdsk=no"); + if (sbi->sb_chkdsk == 2) + seq_printf(seq, ",chkdsk=always"); + if (!sbi->sb_eas) + seq_printf(seq, ",eas=no"); + if (sbi->sb_eas == 1) + seq_printf(seq, ",eas=ro"); + if (sbi->sb_timeshift) + seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift); + return 0; +} + /* Super operations */ static const struct super_operations hpfs_sops = @@ -517,7 +540,7 @@ static const struct super_operations hpf .put_super = hpfs_put_super, .statfs = hpfs_statfs, .remount_fs = hpfs_remount_fs, - .show_options = generic_show_options, + .show_options = hpfs_show_options, }; static int hpfs_fill_super(struct super_block *s, void *options, int silent) @@ -540,8 +563,6 @@ static int hpfs_fill_super(struct super_ int o; - save_mount_options(s, options); - sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); if (!sbi) { return -ENOMEM;
Powered by blists - more mailing lists