git: fb9013f21521 - main - pcm: centralize 32-bit ioctl compat
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Date: Thu, 23 May 2024 16:16:15 UTC
The branch main has been updated by brooks: URL: https://cgit.FreeBSD.org/src/commit/?id=fb9013f215211f013eccc54786f299e39a1f8773 commit fb9013f215211f013eccc54786f299e39a1f8773 Author: Brooks Davis <brooks@FreeBSD.org> AuthorDate: 2024-05-23 16:14:36 +0000 Commit: Brooks Davis <brooks@FreeBSD.org> CommitDate: 2024-05-23 16:15:09 +0000 pcm: centralize 32-bit ioctl compat Move all handlng of struct sndstioc_nv_arg(32) to sndstat_ioctl() and make the functions that actually do the work take a buffer and size or size pointer. The 32-bit compat work is minimal so just inline it. Remove checks that we've got a 32-bit process for 32-bit ioctls. We don't check that default ioctls are from 64-bit processes on 64-bit systems. Reviewed by: christos Differential Revision: https://reviews.freebsd.org/D45307 --- sys/dev/sound/pcm/sndstat.c | 95 ++++++++++++++------------------------------- 1 file changed, 29 insertions(+), 66 deletions(-) diff --git a/sys/dev/sound/pcm/sndstat.c b/sys/dev/sound/pcm/sndstat.c index 6880ce383ba4..6670a1e43aac 100644 --- a/sys/dev/sound/pcm/sndstat.c +++ b/sys/dev/sound/pcm/sndstat.c @@ -45,9 +45,6 @@ #include <sys/nv.h> #include <sys/dnv.h> #include <sys/sx.h> -#ifdef COMPAT_FREEBSD32 -#include <sys/sysent.h> -#endif #include <dev/sound/pcm/sound.h> #include <dev/sound/pcm/pcm.h> @@ -622,10 +619,9 @@ sndstat_refresh_devs(struct sndstat_file *pf) } static int -sndstat_get_devs(struct sndstat_file *pf, caddr_t data) +sndstat_get_devs(struct sndstat_file *pf, void *arg_buf, size_t *arg_nbytes) { int err; - struct sndstioc_nv_arg *arg = (struct sndstioc_nv_arg *)data; SNDSTAT_LOCK(); sx_xlock(&pf->lock); @@ -664,22 +660,22 @@ sndstat_get_devs(struct sndstat_file *pf, caddr_t data) SNDSTAT_UNLOCK(); - if (!arg->nbytes) { - arg->nbytes = pf->devs_nbytes; + if (*arg_nbytes == 0) { + *arg_nbytes = pf->devs_nbytes; err = 0; goto done; } - if (arg->nbytes < pf->devs_nbytes) { - arg->nbytes = 0; + if (*arg_nbytes < pf->devs_nbytes) { + *arg_nbytes = 0; err = 0; goto done; } - err = copyout(pf->devs_nvlbuf, arg->buf, pf->devs_nbytes); + err = copyout(pf->devs_nvlbuf, arg_buf, pf->devs_nbytes); if (err) goto done; - arg->nbytes = pf->devs_nbytes; + *arg_nbytes = pf->devs_nbytes; free(pf->devs_nvlbuf, M_NVLIST); pf->devs_nvlbuf = NULL; @@ -850,25 +846,24 @@ sndstat_dsp_unpack_nvlist(const nvlist_t *nvlist, struct sndstat_userdev *ud) } static int -sndstat_add_user_devs(struct sndstat_file *pf, caddr_t data) +sndstat_add_user_devs(struct sndstat_file *pf, void *nvlbuf, size_t nbytes) { int err; nvlist_t *nvl = NULL; const nvlist_t * const *dsps; size_t i, ndsps; - struct sndstioc_nv_arg *arg = (struct sndstioc_nv_arg *)data; if ((pf->fflags & FWRITE) == 0) { err = EPERM; goto done; } - if (arg->nbytes > SNDST_UNVLBUF_MAX) { + if (nbytes > SNDST_UNVLBUF_MAX) { err = ENOMEM; goto done; } - err = sndstat_unpack_user_nvlbuf(arg->buf, arg->nbytes, &nvl); + err = sndstat_unpack_user_nvlbuf(nvlbuf, nbytes, &nvl); if (err != 0) goto done; @@ -914,52 +909,17 @@ sndstat_flush_user_devs(struct sndstat_file *pf) return (0); } -#ifdef COMPAT_FREEBSD32 -static int -compat_sndstat_get_devs32(struct sndstat_file *pf, caddr_t data) -{ - struct sndstioc_nv_arg32 *arg32 = (struct sndstioc_nv_arg32 *)data; - struct sndstioc_nv_arg arg; - int err; - - arg.buf = (void *)(uintptr_t)arg32->buf; - arg.nbytes = arg32->nbytes; - - err = sndstat_get_devs(pf, (caddr_t)&arg); - if (err == 0) { - arg32->buf = (uint32_t)(uintptr_t)arg.buf; - arg32->nbytes = arg.nbytes; - } - - return (err); -} - -static int -compat_sndstat_add_user_devs32(struct sndstat_file *pf, caddr_t data) -{ - struct sndstioc_nv_arg32 *arg32 = (struct sndstioc_nv_arg32 *)data; - struct sndstioc_nv_arg arg; - int err; - - arg.buf = (void *)(uintptr_t)arg32->buf; - arg.nbytes = arg32->nbytes; - - err = sndstat_add_user_devs(pf, (caddr_t)&arg); - if (err == 0) { - arg32->buf = (uint32_t)(uintptr_t)arg.buf; - arg32->nbytes = arg.nbytes; - } - - return (err); -} -#endif - static int sndstat_ioctl( struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) { int err; struct sndstat_file *pf; + struct sndstioc_nv_arg *arg; +#ifdef COMPAT_FREEBSD32 + struct sndstioc_nv_arg32 *arg32; + size_t nbytes; +#endif err = devfs_get_cdevpriv((void **)&pf); if (err != 0) @@ -967,27 +927,30 @@ sndstat_ioctl( switch (cmd) { case SNDSTIOC_GET_DEVS: - err = sndstat_get_devs(pf, data); + arg = (struct sndstioc_nv_arg *)data; + err = sndstat_get_devs(pf, arg->buf, &arg->nbytes); break; #ifdef COMPAT_FREEBSD32 case SNDSTIOC_GET_DEVS32: - if (!SV_CURPROC_FLAG(SV_ILP32)) { - err = ENODEV; - break; + arg32 = (struct sndstioc_nv_arg32 *)data; + nbytes = arg32->nbytes; + err = sndstat_get_devs(pf, (void *)(uintptr_t)arg32->buf, + &nbytes); + if (err == 0) { + KASSERT(nbytes < UINT_MAX, ("impossibly many bytes")); + arg32->nbytes = nbytes; } - err = compat_sndstat_get_devs32(pf, data); break; #endif case SNDSTIOC_ADD_USER_DEVS: - err = sndstat_add_user_devs(pf, data); + arg = (struct sndstioc_nv_arg *)data; + err = sndstat_add_user_devs(pf, arg->buf, arg->nbytes); break; #ifdef COMPAT_FREEBSD32 case SNDSTIOC_ADD_USER_DEVS32: - if (!SV_CURPROC_FLAG(SV_ILP32)) { - err = ENODEV; - break; - } - err = compat_sndstat_add_user_devs32(pf, data); + arg32 = (struct sndstioc_nv_arg32 *)data; + err = sndstat_add_user_devs(pf, (void *)(uintptr_t)arg32->buf, + arg32->nbytes); break; #endif case SNDSTIOC_REFRESH_DEVS: