| Message ID | 20190208131341.15792-3-mazocomp@disroot.org |
|---|---|
| State | New |
| Series | "Series without cover letter" |
| Headers | show |
diff --git a/configure.ac b/configure.ac index 912330e..d106a41 100644 --- a/configure.ac +++ b/configure.ac @@ -65,6 +65,9 @@ AC_SUBST(GCC_CFLAGS) AC_CHECK_HEADERS([sys/prctl.h]) AC_CHECK_FUNCS([accept4 mkostemp posix_fallocate prctl]) +# Credential support on BSD +AC_CHECK_HEADERS([sys/ucred.h]) + # Replacement for /proc on BSD AC_CHECK_HEADERS([kvm.h]) SAVE_LIBS="$LIBS" diff --git a/src/wayland-server.c b/src/wayland-server.c index 19f6a76..f4cdbf3 100644 --- a/src/wayland-server.c +++ b/src/wayland-server.c @@ -25,6 +25,13 @@ #define _GNU_SOURCE +#include "../config.h" + +#ifdef HAVE_SYS_UCRED_H +#include <sys/types.h> +#include <sys/ucred.h> +#endif + #include <stdlib.h> #include <stdint.h> #include <stddef.h> @@ -77,7 +84,13 @@ struct wl_client { struct wl_list link; struct wl_map objects; struct wl_priv_signal destroy_signal; +#ifdef HAVE_SYS_UCRED_H + /* BSD */ + struct xucred xucred; +#else + /* Linux */ struct ucred ucred; +#endif int error; struct wl_priv_signal resource_created_signal; }; @@ -312,7 +325,11 @@ wl_resource_post_error(struct wl_resource *resource, static void destroy_client_with_error(struct wl_client *client, const char *reason) { +#ifdef HAVE_SYS_UCRED_H + wl_log("%s (uid %u)\n", reason, client->xucred.cr_uid); +#else wl_log("%s (pid %u)\n", reason, client->ucred.pid); +#endif wl_client_destroy(client); } @@ -526,10 +543,29 @@ wl_client_create(struct wl_display *display, int fd) if (!client->source) goto err_client; +#ifndef SO_PEERCRED +/* FreeBSD */ +# define SO_PEERCRED LOCAL_PEERCRED +#endif + +#ifdef HAVE_SYS_UCRED_H + /* BSD */ + len = sizeof client->xucred; + if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, + &client->xucred, &len) < 0 +# ifdef XUCRED_VERSION + /* FreeBSD */ + || client->xucred.cr_version != XUCRED_VERSION +# endif + ) + goto err_source; +#else + /* Linux */ len = sizeof client->ucred; if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &client->ucred, &len) < 0) goto err_source; +#endif client->connection = wl_connection_create(fd); if (client->connection == NULL) @@ -583,12 +619,22 @@ WL_EXPORT void wl_client_get_credentials(struct wl_client *client, pid_t *pid, uid_t *uid, gid_t *gid) { +#ifdef HAVE_SYS_UCRED_H + /* BSD */ + *pid = 0; /* FIXME: pid is not defined on BSD */ + if (uid) + *uid = client->xucred.cr_uid; + if (gid) + *gid = client->xucred.cr_gid; +#else + /* Linux */ if (pid) *pid = client->ucred.pid; if (uid) *uid = client->ucred.uid; if (gid) *gid = client->ucred.gid; +#endif } /** Get the file descriptor for the client diff --git a/src/wayland-shm.c b/src/wayland-shm.c index 4191231..dbaf464 100644 --- a/src/wayland-shm.c +++ b/src/wayland-shm.c @@ -30,6 +30,8 @@ #define _GNU_SOURCE +#include "../config.h" + #include <stdbool.h> #include <stdio.h> #include <stdlib.h> @@ -59,6 +61,9 @@ struct wl_shm_pool { char *data; int32_t size; int32_t new_size; +#ifdef HAVE_SYS_UCRED_H + int fd; +#endif }; struct wl_shm_buffer { @@ -76,15 +81,91 @@ struct wl_shm_sigbus_data { int fallback_mapping_used; }; +#ifdef HAVE_MREMAP +static void * +mremap_compat_maymove(void *old_address, size_t old_size, size_t new_size, + int old_prot, int old_flags, int old_fd) +{ + return mremap(old_address, old_size, new_size, MREMAP_MAYMOVE); +} +#else +static void * +mremap_compat_maymove(void *old_address, size_t old_size, size_t new_size, + int old_prot, int old_flags, int old_fd) +{ + /* FreeBSD doesn't support mremap() yet, so we have to emulate it. + * This assumes MREMAP_MAYMOVE is the only flag in use. */ + if (new_size == old_size) { + return old_address; + } else if (new_size < old_size) { + /* Shrinking: munmap() the spare region. */ + munmap(old_address + old_size, new_size - old_size); + return old_address; + } else { + void *ret; + + /* Growing. Try and mmap() the extra region at the end of + * our existing allocation. If that gets mapped in the + * wrong place, fall back to mmap()ing an entirely new + * region of new_size and copying the data across. */ + ret = mmap(old_address + old_size, new_size - old_size, + old_prot, old_flags, old_fd, 0); + +/* FIXME TODO: msync() before munmap()? */ + if (ret == MAP_FAILED) { + /* Total failure! */ + return ret; + } else if (ret == old_address + old_size) { + /* Success. */ + return old_address; + } else if (ret != old_address + old_size) { + /* Partial failure. Fall back to mapping an + * entirely new region. Unmap the region we + * just mapped first. */ + munmap(ret, new_size - old_size); + + /* Map an entirely new region. */ + ret = mmap(NULL, new_size, + old_prot, old_flags, old_fd, 0); + if (ret == MAP_FAILED) { + /* Total failure! */ + return ret; + } + + /* Copy the old data across. Implicit assumption + * that the old and new regions don't overlap. */ + memcpy(ret, old_address, old_size); + + /* Unmap the old region. */ + munmap(old_address, old_size); + + return ret; + } + } + + /* Unreachable. */ + return MAP_FAILED; +} +#endif + static void shm_pool_finish_resize(struct wl_shm_pool *pool) { void *data; +#ifdef HAVE_SYS_UCRED_H + int fd = -1; +#endif if (pool->size == pool->new_size) return; +#ifdef HAVE_SYS_UCRED_H + fd = pool->fd; + data = mremap_compat_maymove(pool->data, pool->size, pool->new_size, + PROT_READ|PROT_WRITE, MAP_SHARED, fd); +#else data = mremap(pool->data, pool->size, pool->new_size, MREMAP_MAYMOVE); +#endif if (data == MAP_FAILED) { wl_resource_post_error(pool->resource, WL_SHM_ERROR_INVALID_FD, @@ -110,6 +191,10 @@ shm_pool_unref(struct wl_shm_pool *pool, bool external) if (pool->internal_refcount + pool->external_refcount) return; +#ifdef HAVE_SYS_UCRED_H + close(pool->fd); +#endif + munmap(pool->data, pool->size); free(pool); } @@ -284,7 +369,13 @@ shm_create_pool(struct wl_client *client, struct wl_resource *resource, "failed mmap fd %d: %m", fd); goto err_free; } +#ifdef HAVE_SYS_UCRED_H + /* We need to keep the FD around on FreeBSD so we can implement + * mremap(). See: mremap_compat_maymove(). */ + pool->fd = fd; +#else close(fd); +#endif pool->resource = wl_resource_create(client, &wl_shm_pool_interface, 1, id); @@ -364,7 +455,6 @@ wl_shm_buffer_get_stride(struct wl_shm_buffer *buffer) return buffer->stride; } - /** Get a pointer to the memory for the SHM buffer * * \param buffer The buffer object
On Fri, 8 Feb 2019 15:13:36 +0200 Leonid Bobrov <mazocomp@disroot.org> wrote: > Signed-off-by: Leonid Bobrov <mazocomp@disroot.org> > --- > configure.ac | 3 ++ > src/wayland-server.c | 46 ++++++++++++++++++++++ > src/wayland-shm.c | 92 +++++++++++++++++++++++++++++++++++++++++++- > 3 files changed, 140 insertions(+), 1 deletion(-) > > diff --git a/configure.ac b/configure.ac > index 912330e..d106a41 100644 > --- a/configure.ac > +++ b/configure.ac > @@ -65,6 +65,9 @@ AC_SUBST(GCC_CFLAGS) > AC_CHECK_HEADERS([sys/prctl.h]) > AC_CHECK_FUNCS([accept4 mkostemp posix_fallocate prctl]) > > +# Credential support on BSD > +AC_CHECK_HEADERS([sys/ucred.h]) > + > # Replacement for /proc on BSD > AC_CHECK_HEADERS([kvm.h]) > SAVE_LIBS="$LIBS" > diff --git a/src/wayland-server.c b/src/wayland-server.c > index 19f6a76..f4cdbf3 100644 > --- a/src/wayland-server.c > +++ b/src/wayland-server.c > @@ -25,6 +25,13 @@ > > #define _GNU_SOURCE > > +#include "../config.h" Hi Leonid, oh, we're missing config.h in lots of places. Adding that everywhere should probably be a patch in front of the series. Usually that's just #include "config.h" with the build system setting the search paths appropriately. > + > +#ifdef HAVE_SYS_UCRED_H > +#include <sys/types.h> > +#include <sys/ucred.h> > +#endif > + > #include <stdlib.h> > #include <stdint.h> > #include <stddef.h> > @@ -77,7 +84,13 @@ struct wl_client { > struct wl_list link; > struct wl_map objects; > struct wl_priv_signal destroy_signal; > +#ifdef HAVE_SYS_UCRED_H > + /* BSD */ > + struct xucred xucred; > +#else > + /* Linux */ > struct ucred ucred; > +#endif Maybe the above should be replaced with just pid, uid and gid fields, to avoid the #ifdefs here and elsewhere. > int error; > struct wl_priv_signal resource_created_signal; > }; > @@ -312,7 +325,11 @@ wl_resource_post_error(struct wl_resource *resource, > static void > destroy_client_with_error(struct wl_client *client, const char *reason) > { > +#ifdef HAVE_SYS_UCRED_H > + wl_log("%s (uid %u)\n", reason, client->xucred.cr_uid); Printing uid will be as useful as printing pid 0 always, since the user is practically always the same. I'd drop this change. > +#else > wl_log("%s (pid %u)\n", reason, client->ucred.pid); > +#endif > wl_client_destroy(client); > } > > @@ -526,10 +543,29 @@ wl_client_create(struct wl_display *display, int fd) > if (!client->source) > goto err_client; > > +#ifndef SO_PEERCRED > +/* FreeBSD */ > +# define SO_PEERCRED LOCAL_PEERCRED > +#endif This should go to wayland-os.h. > + > +#ifdef HAVE_SYS_UCRED_H > + /* BSD */ > + len = sizeof client->xucred; > + if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, > + &client->xucred, &len) < 0 > +# ifdef XUCRED_VERSION > + /* FreeBSD */ > + || client->xucred.cr_version != XUCRED_VERSION > +# endif > + ) > + goto err_source; > +#else > + /* Linux */ > len = sizeof client->ucred; > if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, > &client->ucred, &len) < 0) > goto err_source; > +#endif Maybe wayland-os.c should have a wrapper for getsockopt(PEERCRED), these #ifdefs are not nice. > > client->connection = wl_connection_create(fd); > if (client->connection == NULL) > @@ -583,12 +619,22 @@ WL_EXPORT void > wl_client_get_credentials(struct wl_client *client, > pid_t *pid, uid_t *uid, gid_t *gid) > { > +#ifdef HAVE_SYS_UCRED_H > + /* BSD */ > + *pid = 0; /* FIXME: pid is not defined on BSD */ > + if (uid) > + *uid = client->xucred.cr_uid; > + if (gid) > + *gid = client->xucred.cr_gid; > +#else > + /* Linux */ > if (pid) > *pid = client->ucred.pid; > if (uid) > *uid = client->ucred.uid; > if (gid) > *gid = client->ucred.gid; > +#endif > } > > /** Get the file descriptor for the client > diff --git a/src/wayland-shm.c b/src/wayland-shm.c > index 4191231..dbaf464 100644 > --- a/src/wayland-shm.c > +++ b/src/wayland-shm.c > @@ -30,6 +30,8 @@ > > #define _GNU_SOURCE > > +#include "../config.h" > + > #include <stdbool.h> > #include <stdio.h> > #include <stdlib.h> > @@ -59,6 +61,9 @@ struct wl_shm_pool { > char *data; > int32_t size; > int32_t new_size; > +#ifdef HAVE_SYS_UCRED_H > + int fd; This field could be present unconditionally, and on Linux it would get initialized to -1 and nothing more. Then you don't have to #ifdef the close() of it either. > +#endif > }; > > struct wl_shm_buffer { > @@ -76,15 +81,91 @@ struct wl_shm_sigbus_data { > int fallback_mapping_used; > }; > > +#ifdef HAVE_MREMAP > +static void * > +mremap_compat_maymove(void *old_address, size_t old_size, size_t new_size, > + int old_prot, int old_flags, int old_fd) > +{ > + return mremap(old_address, old_size, new_size, MREMAP_MAYMOVE); > +} > +#else > +static void * > +mremap_compat_maymove(void *old_address, size_t old_size, size_t new_size, > + int old_prot, int old_flags, int old_fd) > +{ > + /* FreeBSD doesn't support mremap() yet, so we have to emulate it. > + * This assumes MREMAP_MAYMOVE is the only flag in use. */ > + if (new_size == old_size) { > + return old_address; > + } else if (new_size < old_size) { > + /* Shrinking: munmap() the spare region. */ > + munmap(old_address + old_size, new_size - old_size); > + return old_address; > + } else { > + void *ret; > + > + /* Growing. Try and mmap() the extra region at the end of > + * our existing allocation. If that gets mapped in the > + * wrong place, fall back to mmap()ing an entirely new > + * region of new_size and copying the data across. */ > + ret = mmap(old_address + old_size, new_size - old_size, > + old_prot, old_flags, old_fd, 0); > + > +/* FIXME TODO: msync() before munmap()? */ > + if (ret == MAP_FAILED) { > + /* Total failure! */ > + return ret; > + } else if (ret == old_address + old_size) { > + /* Success. */ > + return old_address; > + } else if (ret != old_address + old_size) { > + /* Partial failure. Fall back to mapping an > + * entirely new region. Unmap the region we > + * just mapped first. */ > + munmap(ret, new_size - old_size); > + > + /* Map an entirely new region. */ > + ret = mmap(NULL, new_size, > + old_prot, old_flags, old_fd, 0); > + if (ret == MAP_FAILED) { > + /* Total failure! */ > + return ret; > + } > + > + /* Copy the old data across. Implicit assumption > + * that the old and new regions don't overlap. */ > + memcpy(ret, old_address, old_size); > + > + /* Unmap the old region. */ > + munmap(old_address, old_size); > + > + return ret; > + } > + } > + > + /* Unreachable. */ > + return MAP_FAILED; > +} > +#endif mremap_compat_maymove() should be in wayland-os.c. What does this has to do with credentials support, shouldn't this be a separate patch? > + > static void > shm_pool_finish_resize(struct wl_shm_pool *pool) > { > void *data; > +#ifdef HAVE_SYS_UCRED_H Shouldn't all these be HAVE_MREMAP instead? > + int fd = -1; > +#endif > > if (pool->size == pool->new_size) > return; > > +#ifdef HAVE_SYS_UCRED_H > + fd = pool->fd; > + data = mremap_compat_maymove(pool->data, pool->size, pool->new_size, > + PROT_READ|PROT_WRITE, MAP_SHARED, fd); > +#else > data = mremap(pool->data, pool->size, pool->new_size, MREMAP_MAYMOVE); > +#endif This is a redundant fallback. mremap_compat_maymove() works also for Linux, so just call that unconditionally. > if (data == MAP_FAILED) { > wl_resource_post_error(pool->resource, > WL_SHM_ERROR_INVALID_FD, > @@ -110,6 +191,10 @@ shm_pool_unref(struct wl_shm_pool *pool, bool external) > if (pool->internal_refcount + pool->external_refcount) > return; > > +#ifdef HAVE_SYS_UCRED_H > + close(pool->fd); > +#endif > + > munmap(pool->data, pool->size); > free(pool); > } > @@ -284,7 +369,13 @@ shm_create_pool(struct wl_client *client, struct wl_resource *resource, > "failed mmap fd %d: %m", fd); > goto err_free; > } > +#ifdef HAVE_SYS_UCRED_H > + /* We need to keep the FD around on FreeBSD so we can implement > + * mremap(). See: mremap_compat_maymove(). */ > + pool->fd = fd; > +#else > close(fd); > +#endif Yeah, this #ifdef is necessary it seems. > > pool->resource = > wl_resource_create(client, &wl_shm_pool_interface, 1, id); > @@ -364,7 +455,6 @@ wl_shm_buffer_get_stride(struct wl_shm_buffer *buffer) > return buffer->stride; > } > > - > /** Get a pointer to the memory for the SHM buffer > * > * \param buffer The buffer object Thanks, pq
Signed-off-by: Leonid Bobrov <mazocomp@disroot.org> --- configure.ac | 3 ++ src/wayland-server.c | 46 ++++++++++++++++++++++ src/wayland-shm.c | 92 +++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 140 insertions(+), 1 deletion(-)