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NFSv4: Handle open for execute correctly

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When mapping the NFSv4 context to an open mode and access mode,
we need to treat the FMODE_EXEC flag differently. For the open
mode, FMODE_EXEC means we need read share access. For the access
mode checking, we need to verify that the user actually has
execute access.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-06-27 06:30:48 -04:00
parent bcc0e65f47
commit 1bf85d8c98
1 changed files with 20 additions and 8 deletions
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28
fs/nfs/nfs4proc.c
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@ -1165,6 +1165,18 @@ static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
return true;
}
static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
{
return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
}
static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
{
fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
}
static u32
nfs4_map_atomic_open_share(struct nfs_server *server,
fmode_t fmode, int openflags)
@ -2900,14 +2912,13 @@ static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
}
static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
fmode_t fmode,
int flags,
struct nfs_open_context *ctx)
int flags, struct nfs_open_context *ctx)
{
struct nfs4_state_owner *sp = opendata->owner;
struct nfs_server *server = sp->so_server;
struct dentry *dentry;
struct nfs4_state *state;
fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
unsigned int seq;
int ret;
@ -2946,7 +2957,8 @@ static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
/* Parse layoutget results before we check for access */
pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
ret = nfs4_opendata_access(sp->so_cred, opendata, state,
acc_mode, flags);
if (ret != 0)
goto out;
@ -2978,7 +2990,7 @@ static int _nfs4_do_open(struct inode *dir,
struct dentry *dentry = ctx->dentry;
const struct cred *cred = ctx->cred;
struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
struct iattr *sattr = c->sattr;
struct nfs4_label *label = c->label;
@ -3024,7 +3036,7 @@ static int _nfs4_do_open(struct inode *dir,
if (d_really_is_positive(dentry))
opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
status = _nfs4_open_and_get_state(opendata, flags, ctx);
if (status != 0)
goto err_free_label;
state = ctx->state;
@ -3594,9 +3606,9 @@ static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
if (ctx->state == NULL)
return;
if (is_sync)
nfs4_close_sync(ctx->state, ctx->mode);
nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
else
nfs4_close_state(ctx->state, ctx->mode);
nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
}
#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)