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NFS: Don't use GFP_KERNEL in rpcsec_gss downcalls 

Again, we can deadlock if the memory reclaim triggers a writeback that
requires a rpcsec_gss credential lookup.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2010-05-13 12:51:02 -04:00
parent 8535b2be51
commit 1f4c86c0be
8 changed files with 38 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/sunrpc/gss_api.h
View File

@ -35,7 +35,8 @@ int gss_import_sec_context(
const void* input_token,
size_t bufsize,
struct gss_api_mech *mech,
struct gss_ctx **ctx_id);
struct gss_ctx **ctx_id,
gfp_t gfp_mask);
u32 gss_get_mic(
struct gss_ctx *ctx_id,
struct xdr_buf *message,
@ -89,7 +90,8 @@ struct gss_api_ops {
int (*gss_import_sec_context)(
const void *input_token,
size_t bufsize,
struct gss_ctx *ctx_id);
struct gss_ctx *ctx_id,
gfp_t gfp_mask);
u32 (*gss_get_mic)(
struct gss_ctx *ctx_id,
struct xdr_buf *message,

3
include/linux/sunrpc/gss_krb5.h
View File

@ -295,7 +295,8 @@ u32
krb5_derive_key(const struct gss_krb5_enctype *gk5e,
const struct xdr_netobj *inkey,
struct xdr_netobj *outkey,
const struct xdr_netobj *in_constant);
const struct xdr_netobj *in_constant,
gfp_t gfp_mask);
u32
gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e,

2
net/sunrpc/auth_gss/auth_gss.c
View File

@ -229,7 +229,7 @@ gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct
p = ERR_PTR(-EFAULT);
goto err;
}
ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx);
ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, GFP_NOFS);
if (ret < 0) {
p = ERR_PTR(ret);
goto err;

9
net/sunrpc/auth_gss/gss_krb5_keys.c
View File

@ -150,7 +150,8 @@ static void krb5_nfold(u32 inbits, const u8 *in,
u32 krb5_derive_key(const struct gss_krb5_enctype *gk5e,
const struct xdr_netobj *inkey,
struct xdr_netobj *outkey,
const struct xdr_netobj *in_constant)
const struct xdr_netobj *in_constant,
gfp_t gfp_mask)
{
size_t blocksize, keybytes, keylength, n;
unsigned char *inblockdata, *outblockdata, *rawkey;
@ -175,15 +176,15 @@ u32 krb5_derive_key(const struct gss_krb5_enctype *gk5e,
/* allocate and set up buffers */
ret = ENOMEM;
inblockdata = kmalloc(blocksize, GFP_KERNEL);
inblockdata = kmalloc(blocksize, gfp_mask);
if (inblockdata == NULL)
goto err_free_cipher;
outblockdata = kmalloc(blocksize, GFP_KERNEL);
outblockdata = kmalloc(blocksize, gfp_mask);
if (outblockdata == NULL)
goto err_free_in;
rawkey = kmalloc(keybytes, GFP_KERNEL);
rawkey = kmalloc(keybytes, gfp_mask);
if (rawkey == NULL)
goto err_free_out;

34
net/sunrpc/auth_gss/gss_krb5_mech.c
View File

@ -369,7 +369,7 @@ set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
}
static int
context_derive_keys_des3(struct krb5_ctx *ctx)
context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
{
struct xdr_netobj c, keyin, keyout;
u8 cdata[GSS_KRB5_K5CLENGTH];
@ -396,7 +396,7 @@ context_derive_keys_des3(struct krb5_ctx *ctx)
/* derive cksum */
set_cdata(cdata, KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM);
keyout.data = ctx->cksum;
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c);
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
if (err) {
dprintk("%s: Error %d deriving cksum key\n",
__func__, err);
@ -487,7 +487,7 @@ out_err:
}
static int
context_derive_keys_new(struct krb5_ctx *ctx)
context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
{
struct xdr_netobj c, keyin, keyout;
u8 cdata[GSS_KRB5_K5CLENGTH];
@ -503,7 +503,7 @@ context_derive_keys_new(struct krb5_ctx *ctx)
/* initiator seal encryption */
set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
keyout.data = ctx->initiator_seal;
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c);
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
if (err) {
dprintk("%s: Error %d deriving initiator_seal key\n",
__func__, err);
@ -518,7 +518,7 @@ context_derive_keys_new(struct krb5_ctx *ctx)
/* acceptor seal encryption */
set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
keyout.data = ctx->acceptor_seal;
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c);
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
if (err) {
dprintk("%s: Error %d deriving acceptor_seal key\n",
__func__, err);
@ -533,7 +533,7 @@ context_derive_keys_new(struct krb5_ctx *ctx)
/* initiator sign checksum */
set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
keyout.data = ctx->initiator_sign;
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c);
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
if (err) {
dprintk("%s: Error %d deriving initiator_sign key\n",
__func__, err);
@ -543,7 +543,7 @@ context_derive_keys_new(struct krb5_ctx *ctx)
/* acceptor sign checksum */
set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
keyout.data = ctx->acceptor_sign;
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c);
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
if (err) {
dprintk("%s: Error %d deriving acceptor_sign key\n",
__func__, err);
@ -553,7 +553,7 @@ context_derive_keys_new(struct krb5_ctx *ctx)
/* initiator seal integrity */
set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
keyout.data = ctx->initiator_integ;
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c);
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
if (err) {
dprintk("%s: Error %d deriving initiator_integ key\n",
__func__, err);
@ -563,7 +563,7 @@ context_derive_keys_new(struct krb5_ctx *ctx)
/* acceptor seal integrity */
set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
keyout.data = ctx->acceptor_integ;
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c);
err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
if (err) {
dprintk("%s: Error %d deriving acceptor_integ key\n",
__func__, err);
@ -598,7 +598,8 @@ out_err:
}
static int
gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx)
gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
gfp_t gfp_mask)
{
int keylen;
@ -645,7 +646,7 @@ gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx)
}
ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
gss_kerberos_mech.gm_oid.len, GFP_KERNEL);
gss_kerberos_mech.gm_oid.len, gfp_mask);
if (unlikely(ctx->mech_used.data == NULL)) {
p = ERR_PTR(-ENOMEM);
goto out_err;
@ -654,12 +655,12 @@ gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx)
switch (ctx->enctype) {
case ENCTYPE_DES3_CBC_RAW:
return context_derive_keys_des3(ctx);
return context_derive_keys_des3(ctx, gfp_mask);
case ENCTYPE_ARCFOUR_HMAC:
return context_derive_keys_rc4(ctx);
case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
return context_derive_keys_new(ctx);
return context_derive_keys_new(ctx, gfp_mask);
default:
return -EINVAL;
}
@ -670,20 +671,21 @@ out_err:
static int
gss_import_sec_context_kerberos(const void *p, size_t len,
struct gss_ctx *ctx_id)
struct gss_ctx *ctx_id,
gfp_t gfp_mask)
{
const void *end = (const void *)((const char *)p + len);
struct krb5_ctx *ctx;
int ret;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
ctx = kzalloc(sizeof(*ctx), gfp_mask);
if (ctx == NULL)
return -ENOMEM;
if (len == 85)
ret = gss_import_v1_context(p, end, ctx);
else
ret = gss_import_v2_context(p, end, ctx);
ret = gss_import_v2_context(p, end, ctx, gfp_mask);
if (ret == 0)
ctx_id->internal_ctx_id = ctx;

7
net/sunrpc/auth_gss/gss_mech_switch.c
View File

@ -249,14 +249,15 @@ EXPORT_SYMBOL_GPL(gss_mech_put);
int
gss_import_sec_context(const void *input_token, size_t bufsize,
struct gss_api_mech *mech,
struct gss_ctx **ctx_id)
struct gss_ctx **ctx_id,
gfp_t gfp_mask)
{
if (!(*ctx_id = kzalloc(sizeof(**ctx_id), GFP_KERNEL)))
if (!(*ctx_id = kzalloc(sizeof(**ctx_id), gfp_mask)))
return -ENOMEM;
(*ctx_id)->mech_type = gss_mech_get(mech);
return mech->gm_ops
->gss_import_sec_context(input_token, bufsize, *ctx_id);
->gss_import_sec_context(input_token, bufsize, *ctx_id, gfp_mask);
}
/* gss_get_mic: compute a mic over message and return mic_token. */

5
net/sunrpc/auth_gss/gss_spkm3_mech.c
View File

@ -84,13 +84,14 @@ simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
static int
gss_import_sec_context_spkm3(const void *p, size_t len,
struct gss_ctx *ctx_id)
struct gss_ctx *ctx_id,
gfp_t gfp_mask)
{
const void *end = (const void *)((const char *)p + len);
struct spkm3_ctx *ctx;
int version;
if (!(ctx = kzalloc(sizeof(*ctx), GFP_NOFS)))
if (!(ctx = kzalloc(sizeof(*ctx), gfp_mask)))
goto out_err;
p = simple_get_bytes(p, end, &version, sizeof(version));

2
net/sunrpc/auth_gss/svcauth_gss.c
View File

@ -494,7 +494,7 @@ static int rsc_parse(struct cache_detail *cd,
len = qword_get(&mesg, buf, mlen);
if (len < 0)
goto out;
status = gss_import_sec_context(buf, len, gm, &rsci.mechctx);
status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, GFP_KERNEL);
if (status)
goto out;