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authorJustin Hibbits <jhibbits@FreeBSD.org>2022-05-12 20:38:22 +0000
committerJustin Hibbits <jhibbits@FreeBSD.org>2022-05-19 15:49:55 +0000
commit47a57144af25a7bd768b29272d50a36fdf2874ba (patch)
treef31cd0b70af5e752cfd1b66dbf073f8a82ac1a98
parent21add93b58189322b00421f428917759a7034736 (diff)
downloadsrc-47a57144af25a7bd768b29272d50a36fdf2874ba.tar.gz
src-47a57144af25a7bd768b29272d50a36fdf2874ba.zip
cpuset: Byte swap cpuset for compat32 on big endian architectures
Summary: BITSET uses long as its basic underlying type, which is dependent on the compile type, meaning on 32-bit builds the basic type is 32 bits, but on 64-bit builds it's 64 bits. On little endian architectures this doesn't matter, because the LSB is always at the low bit, so the words get effectively concatenated moving between 32-bit and 64-bit, but on big-endian architectures it throws a wrench in, as setting bit 0 in 32-bit mode is equivalent to setting bit 32 in 64-bit mode. To demonstrate: 32-bit mode: BIT_SET(foo, 0): 0x00000001 64-bit sees: 0x0000000100000000 cpuset is the only system interface that uses bitsets, so solve this by swapping the integer sub-components at the copyin/copyout points. Reviewed by: kib MFC after: 3 days Sponsored by: Juniper Networks, Inc. Differential Revision: https://reviews.freebsd.org/D35225
-rw-r--r--sys/compat/freebsd32/freebsd32_misc.c70
-rw-r--r--sys/kern/kern_cpuset.c32
-rw-r--r--sys/sys/cpuset.h9
-rw-r--r--sys/sys/syscallsubr.h10
4 files changed, 101 insertions, 20 deletions
diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
index 25c7a4e17dc7..d4206fdd24aa 100644
--- a/sys/compat/freebsd32/freebsd32_misc.c
+++ b/sys/compat/freebsd32/freebsd32_misc.c
@@ -3310,13 +3310,72 @@ freebsd32_cpuset_getid(struct thread *td,
PAIR32TO64(id_t, uap->id), uap->setid));
}
+static int
+copyin32_set(const void *u, void *k, size_t size)
+{
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+ int rv;
+ struct bitset *kb = k;
+ int *p;
+
+ rv = copyin(u, k, size);
+ if (rv != 0)
+ return (rv);
+
+ p = (int *)kb->__bits;
+ /* Loop through swapping words.
+ * `size' is in bytes, we need bits. */
+ for (int i = 0; i < __bitset_words(size * 8); i++) {
+ int tmp = p[0];
+ p[0] = p[1];
+ p[1] = tmp;
+ p += 2;
+ }
+ return (0);
+#else
+ return (copyin(u, k, size));
+#endif
+}
+
+static int
+copyout32_set(const void *k, void *u, size_t size)
+{
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+ const struct bitset *kb = k;
+ struct bitset *ub = u;
+ const int *kp = (const int *)kb->__bits;
+ int *up = (int *)ub->__bits;
+ int rv;
+
+ for (int i = 0; i < __bitset_words(CPU_SETSIZE); i++) {
+ /* `size' is in bytes, we need bits. */
+ for (int i = 0; i < __bitset_words(size * 8); i++) {
+ rv = suword32(up, kp[1]);
+ if (rv == 0)
+ rv = suword32(up + 1, kp[0]);
+ if (rv != 0)
+ return (EFAULT);
+ }
+ }
+ return (0);
+#else
+ return (copyout(k, u, size));
+#endif
+}
+
+static const struct cpuset_copy_cb cpuset_copy32_cb = {
+ .copyin = copyin32_set,
+ .copyout = copyout32_set
+};
+
int
freebsd32_cpuset_getaffinity(struct thread *td,
struct freebsd32_cpuset_getaffinity_args *uap)
{
return (kern_cpuset_getaffinity(td, uap->level, uap->which,
- PAIR32TO64(id_t,uap->id), uap->cpusetsize, uap->mask));
+ PAIR32TO64(id_t,uap->id), uap->cpusetsize, uap->mask,
+ &cpuset_copy32_cb));
}
int
@@ -3325,7 +3384,8 @@ freebsd32_cpuset_setaffinity(struct thread *td,
{
return (user_cpuset_setaffinity(td, uap->level, uap->which,
- PAIR32TO64(id_t,uap->id), uap->cpusetsize, uap->mask));
+ PAIR32TO64(id_t,uap->id), uap->cpusetsize, uap->mask,
+ &cpuset_copy32_cb));
}
int
@@ -3334,7 +3394,8 @@ freebsd32_cpuset_getdomain(struct thread *td,
{
return (kern_cpuset_getdomain(td, uap->level, uap->which,
- PAIR32TO64(id_t,uap->id), uap->domainsetsize, uap->mask, uap->policy));
+ PAIR32TO64(id_t,uap->id), uap->domainsetsize, uap->mask, uap->policy,
+ &cpuset_copy32_cb));
}
int
@@ -3343,7 +3404,8 @@ freebsd32_cpuset_setdomain(struct thread *td,
{
return (kern_cpuset_setdomain(td, uap->level, uap->which,
- PAIR32TO64(id_t,uap->id), uap->domainsetsize, uap->mask, uap->policy));
+ PAIR32TO64(id_t,uap->id), uap->domainsetsize, uap->mask, uap->policy,
+ &cpuset_copy32_cb));
}
int
diff --git a/sys/kern/kern_cpuset.c b/sys/kern/kern_cpuset.c
index 56d92687a693..e21ec146bb00 100644
--- a/sys/kern/kern_cpuset.c
+++ b/sys/kern/kern_cpuset.c
@@ -52,6 +52,7 @@ __FBSDID("$FreeBSD$");
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/syscallsubr.h>
+#include <sys/sysent.h>
#include <sys/capsicum.h>
#include <sys/cpuset.h>
#include <sys/domainset.h>
@@ -1742,6 +1743,11 @@ cpuset_check_capabilities(struct thread *td, cpulevel_t level, cpuwhich_t which,
return (0);
}
+static const struct cpuset_copy_cb copy_set = {
+ .copyin = copyin,
+ .copyout = copyout
+};
+
#ifndef _SYS_SYSPROTO_H_
struct cpuset_args {
cpusetid_t *setid;
@@ -1883,12 +1889,12 @@ sys_cpuset_getaffinity(struct thread *td, struct cpuset_getaffinity_args *uap)
{
return (kern_cpuset_getaffinity(td, uap->level, uap->which,
- uap->id, uap->cpusetsize, uap->mask));
+ uap->id, uap->cpusetsize, uap->mask, &copy_set));
}
int
kern_cpuset_getaffinity(struct thread *td, cpulevel_t level, cpuwhich_t which,
- id_t id, size_t cpusetsize, cpuset_t *maskp)
+ id_t id, size_t cpusetsize, cpuset_t *maskp, const struct cpuset_copy_cb *cb)
{
struct thread *ttd;
struct cpuset *nset;
@@ -1977,7 +1983,7 @@ kern_cpuset_getaffinity(struct thread *td, cpulevel_t level, cpuwhich_t which,
goto out;
}
size = min(cpusetsize, sizeof(cpuset_t));
- error = copyout(mask, maskp, size);
+ error = cb->copyout(mask, maskp, size);
if (error != 0)
goto out;
if (cpusetsize > size) {
@@ -2021,7 +2027,7 @@ sys_cpuset_setaffinity(struct thread *td, struct cpuset_setaffinity_args *uap)
{
return (user_cpuset_setaffinity(td, uap->level, uap->which,
- uap->id, uap->cpusetsize, uap->mask));
+ uap->id, uap->cpusetsize, uap->mask, &copy_set));
}
int
@@ -2109,7 +2115,7 @@ kern_cpuset_setaffinity(struct thread *td, cpulevel_t level, cpuwhich_t which,
int
user_cpuset_setaffinity(struct thread *td, cpulevel_t level, cpuwhich_t which,
- id_t id, size_t cpusetsize, const cpuset_t *maskp)
+ id_t id, size_t cpusetsize, const cpuset_t *maskp, const struct cpuset_copy_cb *cb)
{
cpuset_t *mask;
int error;
@@ -2117,7 +2123,7 @@ user_cpuset_setaffinity(struct thread *td, cpulevel_t level, cpuwhich_t which,
size = min(cpusetsize, sizeof(cpuset_t));
mask = malloc(sizeof(cpuset_t), M_TEMP, M_WAITOK | M_ZERO);
- error = copyin(maskp, mask, size);
+ error = cb->copyin(maskp, mask, size);
if (error)
goto out;
/*
@@ -2165,12 +2171,13 @@ sys_cpuset_getdomain(struct thread *td, struct cpuset_getdomain_args *uap)
{
return (kern_cpuset_getdomain(td, uap->level, uap->which,
- uap->id, uap->domainsetsize, uap->mask, uap->policy));
+ uap->id, uap->domainsetsize, uap->mask, uap->policy, &copy_set));
}
int
kern_cpuset_getdomain(struct thread *td, cpulevel_t level, cpuwhich_t which,
- id_t id, size_t domainsetsize, domainset_t *maskp, int *policyp)
+ id_t id, size_t domainsetsize, domainset_t *maskp, int *policyp,
+ const struct cpuset_copy_cb *cb)
{
struct domainset outset;
struct thread *ttd;
@@ -2268,7 +2275,7 @@ kern_cpuset_getdomain(struct thread *td, cpulevel_t level, cpuwhich_t which,
}
DOMAINSET_COPY(&outset.ds_mask, mask);
if (error == 0)
- error = copyout(mask, maskp, domainsetsize);
+ error = cb->copyout(mask, maskp, domainsetsize);
if (error == 0)
if (suword32(policyp, outset.ds_policy) != 0)
error = EFAULT;
@@ -2292,12 +2299,13 @@ sys_cpuset_setdomain(struct thread *td, struct cpuset_setdomain_args *uap)
{
return (kern_cpuset_setdomain(td, uap->level, uap->which,
- uap->id, uap->domainsetsize, uap->mask, uap->policy));
+ uap->id, uap->domainsetsize, uap->mask, uap->policy, &copy_set));
}
int
kern_cpuset_setdomain(struct thread *td, cpulevel_t level, cpuwhich_t which,
- id_t id, size_t domainsetsize, const domainset_t *maskp, int policy)
+ id_t id, size_t domainsetsize, const domainset_t *maskp, int policy,
+ const struct cpuset_copy_cb *cb)
{
struct cpuset *nset;
struct cpuset *set;
@@ -2318,7 +2326,7 @@ kern_cpuset_setdomain(struct thread *td, cpulevel_t level, cpuwhich_t which,
return (error);
memset(&domain, 0, sizeof(domain));
mask = malloc(domainsetsize, M_TEMP, M_WAITOK | M_ZERO);
- error = copyin(maskp, mask, domainsetsize);
+ error = cb->copyin(maskp, mask, domainsetsize);
if (error)
goto out;
/*
diff --git a/sys/sys/cpuset.h b/sys/sys/cpuset.h
index 0ce470d5f569..4f55cdc27103 100644
--- a/sys/sys/cpuset.h
+++ b/sys/sys/cpuset.h
@@ -154,6 +154,15 @@ struct prison;
struct proc;
struct thread;
+/*
+ * Callbacks for copying in/out a cpuset or domainset. Used for alternate
+ * ABIs, like compat32.
+ */
+struct cpuset_copy_cb {
+ int (*copyin)(const void *, void *, size_t);
+ int (*copyout)(const void *, void *, size_t);
+};
+
struct cpuset *cpuset_thread0(void);
struct cpuset *cpuset_ref(struct cpuset *);
void cpuset_rel(struct cpuset *);
diff --git a/sys/sys/syscallsubr.h b/sys/sys/syscallsubr.h
index 294539c6593c..70e33e9244c4 100644
--- a/sys/sys/syscallsubr.h
+++ b/sys/sys/syscallsubr.h
@@ -39,6 +39,7 @@
#include <sys/_uio.h>
struct __wrusage;
+struct cpuset_copy_cb;
struct file;
struct filecaps;
enum idtype;
@@ -119,18 +120,19 @@ int kern_connectat(struct thread *td, int dirfd, int fd,
int kern_copy_file_range(struct thread *td, int infd, off_t *inoffp,
int outfd, off_t *outoffp, size_t len, unsigned int flags);
int kern_cpuset_getaffinity(struct thread *td, cpulevel_t level,
- cpuwhich_t which, id_t id, size_t cpusetsize, cpuset_t *maskp);
+ cpuwhich_t which, id_t id, size_t cpusetsize, cpuset_t *maskp,
+ const struct cpuset_copy_cb *cb);
int kern_cpuset_setaffinity(struct thread *td, cpulevel_t level,
cpuwhich_t which, id_t id, cpuset_t *maskp);
int user_cpuset_setaffinity(struct thread *td, cpulevel_t level,
cpuwhich_t which, id_t id, size_t cpusetsize,
- const cpuset_t *maskp);
+ const cpuset_t *maskp, const struct cpuset_copy_cb *cb);
int kern_cpuset_getdomain(struct thread *td, cpulevel_t level,
cpuwhich_t which, id_t id, size_t domainsetsize,
- domainset_t *maskp, int *policyp);
+ domainset_t *maskp, int *policyp, const struct cpuset_copy_cb *cb);
int kern_cpuset_setdomain(struct thread *td, cpulevel_t level,
cpuwhich_t which, id_t id, size_t domainsetsize,
- const domainset_t *maskp, int policy);
+ const domainset_t *maskp, int policy, const struct cpuset_copy_cb *cb);
int kern_cpuset_getid(struct thread *td, cpulevel_t level,
cpuwhich_t which, id_t id, cpusetid_t *setid);
int kern_cpuset_setid(struct thread *td, cpuwhich_t which,