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Diffstat (limited to 'usr/src/uts/common/syscall/rw.c')
-rw-r--r--usr/src/uts/common/syscall/rw.c222
1 files changed, 179 insertions, 43 deletions
diff --git a/usr/src/uts/common/syscall/rw.c b/usr/src/uts/common/syscall/rw.c
index a28894b2c9..943b7d244e 100644
--- a/usr/src/uts/common/syscall/rw.c
+++ b/usr/src/uts/common/syscall/rw.c
@@ -22,7 +22,7 @@
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
- * Copyright (c) 2015, Joyent, Inc. All rights reserved.
+ * Copyright 2015, Joyent, Inc. All rights reserved.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
@@ -50,6 +50,7 @@
#include <sys/debug.h>
#include <sys/rctl.h>
#include <sys/nbmlock.h>
+#include <sys/limits.h>
#define COPYOUT_MAX_CACHE (1<<17) /* 128K */
@@ -607,19 +608,12 @@ out:
return (bcount);
}
-/*
- * XXX -- The SVID refers to IOV_MAX, but doesn't define it. Grrrr....
- * XXX -- However, SVVS expects readv() and writev() to fail if
- * XXX -- iovcnt > 16 (yes, it's hard-coded in the SVVS source),
- * XXX -- so I guess that's the "interface".
- */
-#define DEF_IOV_MAX 16
-
ssize_t
readv(int fdes, struct iovec *iovp, int iovcnt)
{
struct uio auio;
- struct iovec aiov[DEF_IOV_MAX];
+ struct iovec buf[IOV_MAX_STACK], *aiov = buf;
+ int aiovlen = 0;
file_t *fp;
register vnode_t *vp;
struct cpu *cp;
@@ -630,9 +624,14 @@ readv(int fdes, struct iovec *iovp, int iovcnt)
u_offset_t fileoff;
int in_crit = 0;
- if (iovcnt <= 0 || iovcnt > DEF_IOV_MAX)
+ if (iovcnt <= 0 || iovcnt > IOV_MAX)
return (set_errno(EINVAL));
+ if (iovcnt > IOV_MAX_STACK) {
+ aiovlen = iovcnt * sizeof (iovec_t);
+ aiov = kmem_alloc(aiovlen, KM_SLEEP);
+ }
+
#ifdef _SYSCALL32_IMPL
/*
* 32-bit callers need to have their iovec expanded,
@@ -640,36 +639,63 @@ readv(int fdes, struct iovec *iovp, int iovcnt)
* of data in a single call.
*/
if (get_udatamodel() == DATAMODEL_ILP32) {
- struct iovec32 aiov32[DEF_IOV_MAX];
+ struct iovec32 buf32[IOV_MAX_STACK], *aiov32 = buf32;
+ int aiov32len;
ssize32_t count32;
- if (copyin(iovp, aiov32, iovcnt * sizeof (struct iovec32)))
+ aiov32len = iovcnt * sizeof (iovec32_t);
+ if (aiovlen != 0)
+ aiov32 = kmem_alloc(aiov32len, KM_SLEEP);
+
+ if (copyin(iovp, aiov32, aiov32len)) {
+ if (aiovlen != 0) {
+ kmem_free(aiov32, aiov32len);
+ kmem_free(aiov, aiovlen);
+ }
return (set_errno(EFAULT));
+ }
count32 = 0;
for (i = 0; i < iovcnt; i++) {
ssize32_t iovlen32 = aiov32[i].iov_len;
count32 += iovlen32;
- if (iovlen32 < 0 || count32 < 0)
+ if (iovlen32 < 0 || count32 < 0) {
+ if (aiovlen != 0) {
+ kmem_free(aiov32, aiov32len);
+ kmem_free(aiov, aiovlen);
+ }
return (set_errno(EINVAL));
+ }
aiov[i].iov_len = iovlen32;
aiov[i].iov_base =
(caddr_t)(uintptr_t)aiov32[i].iov_base;
}
+
+ if (aiovlen != 0)
+ kmem_free(aiov32, aiov32len);
} else
#endif
- if (copyin(iovp, aiov, iovcnt * sizeof (struct iovec)))
+ if (copyin(iovp, aiov, iovcnt * sizeof (iovec_t))) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EFAULT));
+ }
count = 0;
for (i = 0; i < iovcnt; i++) {
ssize_t iovlen = aiov[i].iov_len;
count += iovlen;
- if (iovlen < 0 || count < 0)
+ if (iovlen < 0 || count < 0) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EINVAL));
+ }
}
- if ((fp = getf(fdes)) == NULL)
+ if ((fp = getf(fdes)) == NULL) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EBADF));
+ }
if (((fflag = fp->f_flag) & FREAD) == 0) {
error = EBADF;
goto out;
@@ -768,6 +794,8 @@ out:
if (in_crit)
nbl_end_crit(vp);
releasef(fdes);
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
if (error)
return (set_errno(error));
return (count);
@@ -777,7 +805,8 @@ ssize_t
writev(int fdes, struct iovec *iovp, int iovcnt)
{
struct uio auio;
- struct iovec aiov[DEF_IOV_MAX];
+ struct iovec buf[IOV_MAX_STACK], *aiov = buf;
+ int aiovlen = 0;
file_t *fp;
register vnode_t *vp;
struct cpu *cp;
@@ -788,9 +817,14 @@ writev(int fdes, struct iovec *iovp, int iovcnt)
u_offset_t fileoff;
int in_crit = 0;
- if (iovcnt <= 0 || iovcnt > DEF_IOV_MAX)
+ if (iovcnt <= 0 || iovcnt > IOV_MAX)
return (set_errno(EINVAL));
+ if (iovcnt > IOV_MAX_STACK) {
+ aiovlen = iovcnt * sizeof (iovec_t);
+ aiov = kmem_alloc(aiovlen, KM_SLEEP);
+ }
+
#ifdef _SYSCALL32_IMPL
/*
* 32-bit callers need to have their iovec expanded,
@@ -798,36 +832,62 @@ writev(int fdes, struct iovec *iovp, int iovcnt)
* of data in a single call.
*/
if (get_udatamodel() == DATAMODEL_ILP32) {
- struct iovec32 aiov32[DEF_IOV_MAX];
+ struct iovec32 buf32[IOV_MAX_STACK], *aiov32 = buf32;
+ int aiov32len;
ssize32_t count32;
- if (copyin(iovp, aiov32, iovcnt * sizeof (struct iovec32)))
+ aiov32len = iovcnt * sizeof (iovec32_t);
+ if (aiovlen != 0)
+ aiov32 = kmem_alloc(aiov32len, KM_SLEEP);
+
+ if (copyin(iovp, aiov32, aiov32len)) {
+ if (aiovlen != 0) {
+ kmem_free(aiov32, aiov32len);
+ kmem_free(aiov, aiovlen);
+ }
return (set_errno(EFAULT));
+ }
count32 = 0;
for (i = 0; i < iovcnt; i++) {
ssize32_t iovlen = aiov32[i].iov_len;
count32 += iovlen;
- if (iovlen < 0 || count32 < 0)
+ if (iovlen < 0 || count32 < 0) {
+ if (aiovlen != 0) {
+ kmem_free(aiov32, aiov32len);
+ kmem_free(aiov, aiovlen);
+ }
return (set_errno(EINVAL));
+ }
aiov[i].iov_len = iovlen;
aiov[i].iov_base =
(caddr_t)(uintptr_t)aiov32[i].iov_base;
}
+ if (aiovlen != 0)
+ kmem_free(aiov32, aiov32len);
} else
#endif
- if (copyin(iovp, aiov, iovcnt * sizeof (struct iovec)))
+ if (copyin(iovp, aiov, iovcnt * sizeof (iovec_t))) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EFAULT));
+ }
count = 0;
for (i = 0; i < iovcnt; i++) {
ssize_t iovlen = aiov[i].iov_len;
count += iovlen;
- if (iovlen < 0 || count < 0)
+ if (iovlen < 0 || count < 0) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EINVAL));
+ }
}
- if ((fp = getf(fdes)) == NULL)
+ if ((fp = getf(fdes)) == NULL) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EBADF));
+ }
if (((fflag = fp->f_flag) & FWRITE) == 0) {
error = EBADF;
goto out;
@@ -917,6 +977,8 @@ out:
if (in_crit)
nbl_end_crit(vp);
releasef(fdes);
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
if (error)
return (set_errno(error));
return (count);
@@ -927,7 +989,8 @@ preadv(int fdes, struct iovec *iovp, int iovcnt, off_t offset,
off_t extended_offset)
{
struct uio auio;
- struct iovec aiov[DEF_IOV_MAX];
+ struct iovec buf[IOV_MAX_STACK], *aiov = buf;
+ int aiovlen = 0;
file_t *fp;
register vnode_t *vp;
struct cpu *cp;
@@ -952,9 +1015,14 @@ preadv(int fdes, struct iovec *iovp, int iovcnt, off_t offset,
int in_crit = 0;
- if (iovcnt <= 0 || iovcnt > DEF_IOV_MAX)
+ if (iovcnt <= 0 || iovcnt > IOV_MAX)
return (set_errno(EINVAL));
+ if (iovcnt > IOV_MAX_STACK) {
+ aiovlen = iovcnt * sizeof (iovec_t);
+ aiov = kmem_alloc(aiovlen, KM_SLEEP);
+ }
+
#ifdef _SYSCALL32_IMPL
/*
* 32-bit callers need to have their iovec expanded,
@@ -962,39 +1030,68 @@ preadv(int fdes, struct iovec *iovp, int iovcnt, off_t offset,
* of data in a single call.
*/
if (get_udatamodel() == DATAMODEL_ILP32) {
- struct iovec32 aiov32[DEF_IOV_MAX];
+ struct iovec32 buf32[IOV_MAX_STACK], *aiov32 = buf32;
+ int aiov32len;
ssize32_t count32;
- if (copyin(iovp, aiov32, iovcnt * sizeof (struct iovec32)))
+ aiov32len = iovcnt * sizeof (iovec32_t);
+ if (aiovlen != 0)
+ aiov32 = kmem_alloc(aiov32len, KM_SLEEP);
+
+ if (copyin(iovp, aiov32, aiov32len)) {
+ if (aiovlen != 0) {
+ kmem_free(aiov32, aiov32len);
+ kmem_free(aiov, aiovlen);
+ }
return (set_errno(EFAULT));
+ }
count32 = 0;
for (i = 0; i < iovcnt; i++) {
ssize32_t iovlen32 = aiov32[i].iov_len;
count32 += iovlen32;
- if (iovlen32 < 0 || count32 < 0)
+ if (iovlen32 < 0 || count32 < 0) {
+ if (aiovlen != 0) {
+ kmem_free(aiov32, aiov32len);
+ kmem_free(aiov, aiovlen);
+ }
return (set_errno(EINVAL));
+ }
aiov[i].iov_len = iovlen32;
aiov[i].iov_base =
(caddr_t)(uintptr_t)aiov32[i].iov_base;
}
+ if (aiovlen != 0)
+ kmem_free(aiov32, aiov32len);
} else
#endif /* _SYSCALL32_IMPL */
- if (copyin(iovp, aiov, iovcnt * sizeof (struct iovec)))
+ if (copyin(iovp, aiov, iovcnt * sizeof (iovec_t))) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EFAULT));
+ }
count = 0;
for (i = 0; i < iovcnt; i++) {
ssize_t iovlen = aiov[i].iov_len;
count += iovlen;
- if (iovlen < 0 || count < 0)
+ if (iovlen < 0 || count < 0) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EINVAL));
+ }
}
- if ((bcount = (ssize_t)count) < 0)
+ if ((bcount = (ssize_t)count) < 0) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EINVAL));
- if ((fp = getf(fdes)) == NULL)
+ }
+ if ((fp = getf(fdes)) == NULL) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EBADF));
+ }
if (((fflag = fp->f_flag) & FREAD) == 0) {
error = EBADF;
goto out;
@@ -1099,6 +1196,8 @@ out:
if (in_crit)
nbl_end_crit(vp);
releasef(fdes);
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
if (error)
return (set_errno(error));
return (count);
@@ -1109,7 +1208,8 @@ pwritev(int fdes, struct iovec *iovp, int iovcnt, off_t offset,
off_t extended_offset)
{
struct uio auio;
- struct iovec aiov[DEF_IOV_MAX];
+ struct iovec buf[IOV_MAX_STACK], *aiov = buf;
+ int aiovlen = 0;
file_t *fp;
register vnode_t *vp;
struct cpu *cp;
@@ -1134,9 +1234,14 @@ pwritev(int fdes, struct iovec *iovp, int iovcnt, off_t offset,
int in_crit = 0;
- if (iovcnt <= 0 || iovcnt > DEF_IOV_MAX)
+ if (iovcnt <= 0 || iovcnt > IOV_MAX)
return (set_errno(EINVAL));
+ if (iovcnt > IOV_MAX_STACK) {
+ aiovlen = iovcnt * sizeof (iovec_t);
+ aiov = kmem_alloc(aiovlen, KM_SLEEP);
+ }
+
#ifdef _SYSCALL32_IMPL
/*
* 32-bit callers need to have their iovec expanded,
@@ -1144,39 +1249,68 @@ pwritev(int fdes, struct iovec *iovp, int iovcnt, off_t offset,
* of data in a single call.
*/
if (get_udatamodel() == DATAMODEL_ILP32) {
- struct iovec32 aiov32[DEF_IOV_MAX];
+ struct iovec32 buf32[IOV_MAX_STACK], *aiov32 = buf32;
+ int aiov32len;
ssize32_t count32;
- if (copyin(iovp, aiov32, iovcnt * sizeof (struct iovec32)))
+ aiov32len = iovcnt * sizeof (iovec32_t);
+ if (aiovlen != 0)
+ aiov32 = kmem_alloc(aiov32len, KM_SLEEP);
+
+ if (copyin(iovp, aiov32, aiov32len)) {
+ if (aiovlen != 0) {
+ kmem_free(aiov32, aiov32len);
+ kmem_free(aiov, aiovlen);
+ }
return (set_errno(EFAULT));
+ }
count32 = 0;
for (i = 0; i < iovcnt; i++) {
ssize32_t iovlen32 = aiov32[i].iov_len;
count32 += iovlen32;
- if (iovlen32 < 0 || count32 < 0)
+ if (iovlen32 < 0 || count32 < 0) {
+ if (aiovlen != 0) {
+ kmem_free(aiov32, aiov32len);
+ kmem_free(aiov, aiovlen);
+ }
return (set_errno(EINVAL));
+ }
aiov[i].iov_len = iovlen32;
aiov[i].iov_base =
(caddr_t)(uintptr_t)aiov32[i].iov_base;
}
+ if (aiovlen != 0)
+ kmem_free(aiov32, aiov32len);
} else
#endif /* _SYSCALL32_IMPL */
- if (copyin(iovp, aiov, iovcnt * sizeof (struct iovec)))
+ if (copyin(iovp, aiov, iovcnt * sizeof (iovec_t))) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EFAULT));
+ }
count = 0;
for (i = 0; i < iovcnt; i++) {
ssize_t iovlen = aiov[i].iov_len;
count += iovlen;
- if (iovlen < 0 || count < 0)
+ if (iovlen < 0 || count < 0) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EINVAL));
+ }
}
- if ((bcount = (ssize_t)count) < 0)
+ if ((bcount = (ssize_t)count) < 0) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EINVAL));
- if ((fp = getf(fdes)) == NULL)
+ }
+ if ((fp = getf(fdes)) == NULL) {
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
return (set_errno(EBADF));
+ }
if (((fflag = fp->f_flag) & FWRITE) == 0) {
error = EBADF;
goto out;
@@ -1308,6 +1442,8 @@ out:
if (in_crit)
nbl_end_crit(vp);
releasef(fdes);
+ if (aiovlen != 0)
+ kmem_free(aiov, aiovlen);
if (error)
return (set_errno(error));
return (count);
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 00:59:23 +0000