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| author |   Enzo Matsumiya <ematsumiya@suse.de> | 2022-09-20 15:10:35 -0300 |
|---|---|---|
| committer |   Steve French <stfrench@microsoft.com> | 2022-10-07 23:06:48 -0500 |
| commit | a4e430c8c8ba96be8c6ec4f2eb108bb8bcbee069 (patch) | |
| tree | ff8fb70c06b5dd58f6c8d89a0b5d4d19c5a4fc5d /fs/cifs/fs_context.c | |
| parent | cifs: remove initialization value (diff) | |
| download | linux-dev-a4e430c8c8ba96be8c6ec4f2eb108bb8bcbee069.tar.xz linux-dev-a4e430c8c8ba96be8c6ec4f2eb108bb8bcbee069.zip | |
cifs: replace kfree() with kfree_sensitive() for sensitive data
Replace kfree with kfree_sensitive, or prepend memzero_explicit() in
other cases, when freeing sensitive material that could still be left
in memory.
Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
Reported-by: kernel test robot <oliver.sang@intel.com>
Link: https://lore.kernel.org/r/202209201529.ec633796-oliver.sang@intel.com
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/fs_context.c')
| -rw-r--r-- | fs/cifs/fs_context.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c index 0e13dec86b25..45119597c765 100644 --- a/fs/cifs/fs_context.c +++ b/fs/cifs/fs_context.c @@ -791,6 +791,13 @@ do { \ cifs_sb->ctx->field = NULL; \ } while (0) +#define STEAL_STRING_SENSITIVE(cifs_sb, ctx, field) \ +do { \ + kfree_sensitive(ctx->field); \ + ctx->field = cifs_sb->ctx->field; \ + cifs_sb->ctx->field = NULL; \ +} while (0) + static int smb3_reconfigure(struct fs_context *fc) { struct smb3_fs_context *ctx = smb3_fc2context(fc); @@ -811,7 +818,7 @@ static int smb3_reconfigure(struct fs_context *fc) STEAL_STRING(cifs_sb, ctx, UNC); STEAL_STRING(cifs_sb, ctx, source); STEAL_STRING(cifs_sb, ctx, username); - STEAL_STRING(cifs_sb, ctx, password); + STEAL_STRING_SENSITIVE(cifs_sb, ctx, password); STEAL_STRING(cifs_sb, ctx, domainname); STEAL_STRING(cifs_sb, ctx, nodename); STEAL_STRING(cifs_sb, ctx, iocharset); @@ -1162,7 +1169,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc, } break; case Opt_pass: - kfree(ctx->password); + kfree_sensitive(ctx->password); ctx->password = NULL; if (strlen(param->string) == 0) break; @@ -1470,6 +1477,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc, return 0; cifs_parse_mount_err: + kfree_sensitive(ctx->password); return -EINVAL; } |