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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 22/27] NFS: Add a small buffer in nfs_fs_context to avoid string dup [ver #5] From: David Howells To: mszeredi@redhat.com, viro@zeniv.linux.org.uk Cc: linux-nfs@vger.kernel.org, jlayton@redhat.com, linux-kernel@vger.kernel.org, dhowells@redhat.com, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org Date: Wed, 14 Jun 2017 16:18:34 +0100 Message-ID: <149745351477.10897.3038422602772913461.stgit@warthog.procyon.org.uk> In-Reply-To: <149745330648.10897.9605870130502083184.stgit@warthog.procyon.org.uk> References: <149745330648.10897.9605870130502083184.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 14 Jun 2017 15:18:37 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a small buffer in nfs_fs_context to avoid string duplication when parsing numbers. Also make the parsing function wrapper place the parsed integer directly in the appropriate nfs_fs_context struct member. Signed-off-by: David Howells --- fs/nfs/fs_context.c | 83 ++++++++++++++++++--------------------------------- fs/nfs/internal.h | 2 + 2 files changed, 32 insertions(+), 53 deletions(-) diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c index a2ff9c30ff5a..763a09b64971 100644 --- a/fs/nfs/fs_context.c +++ b/fs/nfs/fs_context.c @@ -466,27 +466,22 @@ static int nfs_get_option_str(substring_t args[], char **option) return !*option; } -static int nfs_get_option_ul(substring_t args[], unsigned long *option) +static int nfs_get_option_ui(struct nfs_fs_context *ctx, + substring_t args[], unsigned int *option) { - int rc; - char *string; - - string = match_strdup(args); - if (string == NULL) - return -ENOMEM; - rc = kstrtoul(string, 10, option); - kfree(string); - - return rc; + match_strlcpy(ctx->buf, args, sizeof(ctx->buf)); + return kstrtouint(ctx->buf, 10, option); } -static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option, - unsigned long l_bound, unsigned long u_bound) +static int nfs_get_option_ui_bound(struct nfs_fs_context *ctx, + substring_t args[], unsigned int *option, + unsigned int l_bound, unsigned u_bound) { int ret; - ret = nfs_get_option_ul(args, option); - if (ret != 0) + match_strlcpy(ctx->buf, args, sizeof(ctx->buf)); + ret = kstrtouint(ctx->buf, 10, option); + if (ret < 0) return ret; if (*option < l_bound || *option > u_bound) return -ERANGE; @@ -499,7 +494,6 @@ static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option, static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) { substring_t args[MAX_OPT_ARGS]; - unsigned long option; char *string; int rc, token; @@ -507,7 +501,6 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) token = match_token(p, nfs_mount_option_tokens, args); switch (token) { - /* * boolean options: foo/nofoo */ @@ -603,86 +596,70 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) * options that take numeric values */ case Opt_port: - if (nfs_get_option_ul(args, &option) || - option > USHRT_MAX) + if (nfs_get_option_ui_bound(ctx, args, &ctx->nfs_server.port, + 0, USHRT_MAX)) goto out_invalid_value; - ctx->nfs_server.port = option; break; case Opt_rsize: - if (nfs_get_option_ul(args, &option)) + if (nfs_get_option_ui(ctx, args, &ctx->rsize)) goto out_invalid_value; - ctx->rsize = option; break; case Opt_wsize: - if (nfs_get_option_ul(args, &option)) + if (nfs_get_option_ui(ctx, args, &ctx->wsize)) goto out_invalid_value; - ctx->wsize = option; break; case Opt_bsize: - if (nfs_get_option_ul(args, &option)) + if (nfs_get_option_ui(ctx, args, &ctx->bsize)) goto out_invalid_value; - ctx->bsize = option; break; case Opt_timeo: - if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX)) + if (nfs_get_option_ui_bound(ctx, args, &ctx->timeo, 1, INT_MAX)) goto out_invalid_value; - ctx->timeo = option; break; case Opt_retrans: - if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX)) + if (nfs_get_option_ui_bound(ctx, args, &ctx->retrans, 0, INT_MAX)) goto out_invalid_value; - ctx->retrans = option; break; case Opt_acregmin: - if (nfs_get_option_ul(args, &option)) + if (nfs_get_option_ui(ctx, args, &ctx->acregmin)) goto out_invalid_value; - ctx->acregmin = option; break; case Opt_acregmax: - if (nfs_get_option_ul(args, &option)) + if (nfs_get_option_ui(ctx, args, &ctx->acregmax)) goto out_invalid_value; - ctx->acregmax = option; break; case Opt_acdirmin: - if (nfs_get_option_ul(args, &option)) + if (nfs_get_option_ui(ctx, args, &ctx->acdirmin)) goto out_invalid_value; - ctx->acdirmin = option; break; case Opt_acdirmax: - if (nfs_get_option_ul(args, &option)) + if (nfs_get_option_ui(ctx, args, &ctx->acdirmax)) goto out_invalid_value; - ctx->acdirmax = option; break; case Opt_actimeo: - if (nfs_get_option_ul(args, &option)) + if (nfs_get_option_ui(ctx, args, &ctx->acdirmax)) goto out_invalid_value; ctx->acregmin = ctx->acregmax = - ctx->acdirmin = ctx->acdirmax = option; + ctx->acdirmin = ctx->acdirmax; break; case Opt_namelen: - if (nfs_get_option_ul(args, &option)) + if (nfs_get_option_ui(ctx, args, &ctx->namlen)) goto out_invalid_value; - ctx->namlen = option; break; case Opt_mountport: - if (nfs_get_option_ul(args, &option) || - option > USHRT_MAX) + if (nfs_get_option_ui_bound(ctx, args, &ctx->mount_server.port, + 0, USHRT_MAX)) goto out_invalid_value; - ctx->mount_server.port = option; break; case Opt_mountvers: - if (nfs_get_option_ul(args, &option) || - option < NFS_MNT_VERSION || - option > NFS_MNT3_VERSION) + if (nfs_get_option_ui_bound(ctx, args, &ctx->mount_server.version, + NFS_MNT_VERSION, NFS_MNT3_VERSION)) goto out_invalid_value; - ctx->mount_server.version = option; break; case Opt_minorversion: - if (nfs_get_option_ul(args, &option)) - goto out_invalid_value; - if (option > NFS4_MAX_MINOR_VERSION) + if (nfs_get_option_ui_bound(ctx, args, &ctx->minorversion, + 0, NFS4_MAX_MINOR_VERSION)) goto out_invalid_value; - ctx->minorversion = option; break; /* diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index fab0fca9e0ef..1c5404d846cc 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -125,6 +125,8 @@ struct nfs_fs_context { struct security_mnt_opts lsm_opts; struct net *net; + + char buf[32]; /* Parse buffer */ }; /* mount_clnt.c */