diff options
Diffstat (limited to 'cursor')
| -rw-r--r-- | cursor/os-compatibility.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/cursor/os-compatibility.c b/cursor/os-compatibility.c index f2445ce..2b54bae 100644 --- a/cursor/os-compatibility.c +++ b/cursor/os-compatibility.c @@ -40,6 +40,11 @@ #include <sys/mman.h> #endif +/* Fallback to no flag when missing the definition */ +#ifndef MFD_NOEXEC_SEAL +#define MFD_NOEXEC_SEAL 0 +#endif + #include "os-compatibility.h" #ifndef HAVE_MKOSTEMP @@ -124,7 +129,21 @@ os_create_anonymous_file(off_t size) int fd; #ifdef HAVE_MEMFD_CREATE - fd = memfd_create("wayland-cursor", MFD_CLOEXEC | MFD_ALLOW_SEALING); + /* + * Linux kernels older than 6.3 reject MFD_NOEXEC_SEAL with EINVAL. + * Try first *with* it, and if that fails, try again *without* it. + */ + errno = 0; + fd = memfd_create( + "wayland-cursor", + MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_NOEXEC_SEAL); + + if (fd < 0 && errno == EINVAL && MFD_NOEXEC_SEAL != 0) { + fd = memfd_create( + "wayland-cursor", + MFD_CLOEXEC | MFD_ALLOW_SEALING); + } + if (fd >= 0) { /* We can add this seal before calling posix_fallocate(), as * the file is currently zero-sized anyway. |