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Cap IOSIZE_MAX to INT_MAX for 32-bit processes.

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Previously, freebsd32 binaries could submit read/write requests with lengths
greater than INT_MAX that a native kernel would have rejected.

Reviewed by:	kib
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D5788
This commit is contained in:
John Baldwin 2016-04-01 18:29:38 +00:00
parent 659e74662f
commit 611fcff994
2 changed files with 35 additions and 6 deletions
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24
sys/kern/sys_generic.c
View File

@ -89,12 +89,14 @@ __FBSDID("$FreeBSD$");
#define SYS_IOCTL_SMALL_SIZE 128 /* bytes */
#define SYS_IOCTL_SMALL_ALIGN 8 /* bytes */
int iosize_max_clamp = 0;
#ifdef __LP64__
static int iosize_max_clamp = 0;
SYSCTL_INT(_debug, OID_AUTO, iosize_max_clamp, CTLFLAG_RW,
&iosize_max_clamp, 0, "Clamp max i/o size to INT_MAX");
int devfs_iosize_max_clamp = 1;
static int devfs_iosize_max_clamp = 1;
SYSCTL_INT(_debug, OID_AUTO, devfs_iosize_max_clamp, CTLFLAG_RW,
&devfs_iosize_max_clamp, 0, "Clamp max i/o size to INT_MAX for devices");
#endif
/*
* Assert that the return value of read(2) and write(2) syscalls fits
@ -159,6 +161,24 @@ struct selfd {
static uma_zone_t selfd_zone;
static struct mtx_pool *mtxpool_select;
#ifdef __LP64__
size_t
devfs_iosize_max(void)
{
return (devfs_iosize_max_clamp || SV_CURPROC_FLAG(SV_ILP32) ?
INT_MAX : SSIZE_MAX);
}
size_t
iosize_max(void)
{
return (iosize_max_clamp || SV_CURPROC_FLAG(SV_ILP32) ?
INT_MAX : SSIZE_MAX);
}
#endif
#ifndef _SYS_SYSPROTO_H_
struct read_args {
int fd;

17
sys/sys/systm.h
View File

@ -148,10 +148,14 @@ extern char **kenvp;
extern const void *zero_region; /* address space maps to a zeroed page */
extern int unmapped_buf_allowed;
extern int iosize_max_clamp;
extern int devfs_iosize_max_clamp;
#define IOSIZE_MAX (iosize_max_clamp ? INT_MAX : SSIZE_MAX)
#define DEVFS_IOSIZE_MAX (devfs_iosize_max_clamp ? INT_MAX : SSIZE_MAX)
#ifdef __LP64__
#define IOSIZE_MAX iosize_max()
#define DEVFS_IOSIZE_MAX devfs_iosize_max()
#else
#define IOSIZE_MAX SSIZE_MAX
#define DEVFS_IOSIZE_MAX SSIZE_MAX
#endif
/*
* General function declarations.
@ -403,6 +407,11 @@ struct cdev;
dev_t dev2udev(struct cdev *x);
const char *devtoname(struct cdev *cdev);
#ifdef __LP64__
size_t devfs_iosize_max(void);
size_t iosize_max(void);
#endif
int poll_no_poll(int events);
/* XXX: Should be void nanodelay(u_int nsec); */