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Linux: Add memfd_create system call wrapper
The system call is somewhat obscure because it is closely related to file descriptor sealing. However, it is also the recommended way to create alias mappings, which is why it has more general use. No emulation is provided. Except for the name of the /proc/self/fd links, it would be possible to implement an approximation using O_TMPFILE and tmpfs, but this does not appear to be worth the added complexity. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Florian Weimer
parent
0a9d1d62b3
commit
59d2cbb1fe
14
ChangeLog
14
ChangeLog
@ -1,3 +1,17 @@
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2017-11-23 Florian Weimer <fweimer@redhat.com>
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Linux: Add memfd_create system call wrapper
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* sysdeps/unix/sysv/linux/Makefile [misc] (tests): Add
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tst-memfd_create.
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* sysdeps/unix/sysv/linux/bits/mman-linux.h [__USE_GNU]
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(MFD_CLOEXEC, MFD_ALLOW_SEALING): Define.
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[__USE_GNU] (memfd_create): Declare.
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* sysdeps/unix/sysv/linux/Versions (GLIBC_2.27): Add memfd_create.
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* sysdeps/unix/sysv/linux/syscalls.list (memfd_create): Add.
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* sysdeps/unix/sysv/linux/tst-memfd_create.c: New file.
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* sysdeps/unix/sysv/linux/**.abilist: Update.
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* manual/llio.texi (Memory-mapped I/O): Document memfd_create.
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2017-11-22 Joseph Myers <joseph@codesourcery.com>
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* localedata/gen-locale.sh: Fix typo in variable name.
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2
NEWS
2
NEWS
@ -35,6 +35,8 @@ Major new features:
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are the same interfaces added in version 2.26 for some platforms where
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this format is supported but is not the format of long double.
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* glibc now implements the memfd_create function on Linux.
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Deprecated and removed features, and other changes affecting compatibility:
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* On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
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@ -1801,6 +1801,69 @@ the given @var{name} previously created by @code{shm_open}.
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On failure @code{errno} is set.
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@end deftypefn
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@deftypefun int memfd_create (const char *@var{name}, unsigned int @var{flags})
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@standards{Linux, sys/mman.h}
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@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{@acsfd{}}}
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The @code{memfd_create} function returns a file descriptor which can be
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used to create memory mappings using the @code{mmap} function. It is
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similar to the @code{shm_open} function in the sense that these mappings
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are not backed by actual files. However, the descriptor returned by
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@code{memfd_create} does not correspond to a named object; the
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@var{name} argument is used for debugging purposes only (e.g., will
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appear in @file{/proc}), and separate invocations of @code{memfd_create}
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with the same @var{name} will not return descriptors for the same region
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of memory. The descriptor can also be used to create alias mappings
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within the same process.
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The descriptor initially refers to a zero-length file. Before mappings
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can be created which are backed by memory, the file size needs to be
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increased with the @code{ftruncate} function. @xref{File Size}.
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The @var{flags} argument can be a combination of the following flags:
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@vtable @code
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@item MFD_CLOEXEC
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@standards{Linux, sys/mman.h}
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The descriptor is created with the @code{O_CLOEXEC} flag.
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@item MFD_ALLOW_SEALING
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@standards{Linux, sys/mman.h}
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The descriptor supports the addition of seals using the @code{fcntl}
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function.
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@item MFD_HUGETLB
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@standards{Linux, sys/mman.h}
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This requests that mappings created using the returned file descriptor
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use a larger page size. See @code{MAP_HUGETLB} above for details.
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This flag is incompatible with @code{MFD_ALLOW_SEALING}.
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@end vtable
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@code{memfd_create} returns a file descriptor on success, and @math{-1}
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on failure.
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The following @code{errno} error conditions are defined for this
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function:
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@table @code
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@item EINVAL
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An invalid combination is specified in @var{flags}, or @var{name} is
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too long.
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@item EFAULT
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The @var{name} argument does not point to a string.
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@item EMFILE
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The operation would exceed the file descriptor limit for this process.
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@item ENFILE
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The operation would exceed the system-wide file descriptor limit.
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@item ENOMEM
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There is not enough memory for the operation.
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@end table
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@end deftypefun
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@node Waiting for I/O
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@section Waiting for Input or Output
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@cindex waiting for input or output
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@ -44,7 +44,7 @@ sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
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tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
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tst-quota tst-sync_file_range tst-sysconf-iov_max tst-ttyname \
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test-errno-linux
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test-errno-linux tst-memfd_create
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# Generate the list of SYS_* macros for the system calls (__NR_*
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# macros). The file syscall-names.list contains all possible system
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@ -166,6 +166,9 @@ libc {
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GLIBC_2.15 {
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process_vm_readv; process_vm_writev;
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}
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GLIBC_2.27 {
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memfd_create;
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}
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GLIBC_PRIVATE {
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# functions used in other libraries
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__syscall_rt_sigqueueinfo;
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@ -2106,6 +2106,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strtof128 F
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GLIBC_2.27 strtof128_l F
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@ -2017,6 +2017,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strtof128 F
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GLIBC_2.27 strtof128_l F
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@ -107,6 +107,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.4 GLIBC_2.4 A
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GLIBC_2.4 _Exit F
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GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
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@ -111,3 +111,19 @@
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# define MCL_ONFAULT 4 /* Lock all pages that are
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faulted in. */
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#endif
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#ifdef __USE_GNU
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/* Flags for memfd_create. */
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# define MFD_CLOEXEC 1U
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# define MFD_ALLOW_SEALING 2U
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# define MFD_HUGETLB 4U
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__BEGIN_DECLS
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/* Create a new memory file descriptor. NAME is a name for debugging.
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FLAGS is a combination of the MFD_* constants. */
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int memfd_create (const char *__name, unsigned int __flags) __THROW;
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__END_DECLS
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#endif /* __USE_GNU */
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@ -1871,6 +1871,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -2036,6 +2036,7 @@ GLIBC_2.26 wcstof128_l F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -1900,6 +1900,7 @@ GLIBC_2.26 wcstof128_l F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -108,6 +108,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.4 GLIBC_2.4 A
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GLIBC_2.4 _Exit F
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GLIBC_2.4 _IO_2_1_stderr_ D 0x98
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@ -1985,6 +1985,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -2106,3 +2106,4 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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@ -1960,6 +1960,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -1958,6 +1958,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -1956,6 +1956,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strtof128 F
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GLIBC_2.27 strtof128_l F
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@ -1951,6 +1951,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strtof128 F
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GLIBC_2.27 strtof128_l F
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@ -2147,3 +2147,4 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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@ -1989,6 +1989,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -1994,6 +1994,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -2201,3 +2201,4 @@ GLIBC_2.26 wcstof128_l F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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@ -108,6 +108,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 _Exit F
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GLIBC_2.3 _IO_2_1_stderr_ D 0xe0
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@ -1989,6 +1989,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strtof128 F
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GLIBC_2.27 strtof128_l F
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@ -1890,6 +1890,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strtof128 F
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GLIBC_2.27 strtof128_l F
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@ -1875,6 +1875,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -1982,6 +1982,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strtof128 F
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GLIBC_2.27 strtof128_l F
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@ -1919,6 +1919,7 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
|
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strtof128 F
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GLIBC_2.27 strtof128_l F
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@ -109,3 +109,4 @@ setns EXTRA setns i:ii setns
|
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process_vm_readv EXTRA process_vm_readv i:ipipii process_vm_readv
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process_vm_writev EXTRA process_vm_writev i:ipipii process_vm_writev
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memfd_create EXTRA memfd_create i:si memfd_create
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@ -2113,3 +2113,4 @@ GLIBC_2.26 reallocarray F
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GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
|
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GLIBC_2.27 glob64 F
|
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GLIBC_2.27 memfd_create F
|
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@ -2113,3 +2113,4 @@ GLIBC_2.26 reallocarray F
|
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GLIBC_2.27 GLIBC_2.27 A
|
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GLIBC_2.27 glob F
|
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GLIBC_2.27 glob64 F
|
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GLIBC_2.27 memfd_create F
|
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|
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@ -2113,3 +2113,4 @@ GLIBC_2.26 reallocarray F
|
||||
GLIBC_2.27 GLIBC_2.27 A
|
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GLIBC_2.27 glob F
|
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GLIBC_2.27 glob64 F
|
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GLIBC_2.27 memfd_create F
|
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|
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121
sysdeps/unix/sysv/linux/tst-memfd_create.c
Normal file
121
sysdeps/unix/sysv/linux/tst-memfd_create.c
Normal file
@ -0,0 +1,121 @@
|
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/* Test for the memfd_create system call.
|
||||
Copyright (C) 2017 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <errno.h>
|
||||
#include <fcntl.h>
|
||||
#include <stdbool.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <support/check.h>
|
||||
#include <support/support.h>
|
||||
#include <support/test-driver.h>
|
||||
#include <support/xunistd.h>
|
||||
#include <sys/mman.h>
|
||||
|
||||
/* Return true if the descriptor has the FD_CLOEXEC flag set. */
|
||||
static bool
|
||||
is_cloexec (int fd)
|
||||
{
|
||||
int flags = fcntl (fd, F_GETFD);
|
||||
TEST_VERIFY (flags >= 0);
|
||||
return flags & FD_CLOEXEC;
|
||||
}
|
||||
|
||||
/* Return the seals set on FD. */
|
||||
static int
|
||||
get_seals (int fd)
|
||||
{
|
||||
int flags = fcntl (fd, F_GET_SEALS);
|
||||
TEST_VERIFY (flags >= 0);
|
||||
return flags;
|
||||
}
|
||||
|
||||
/* Return true if the F_SEAL_SEAL flag is set on the descriptor. */
|
||||
static bool
|
||||
is_sealed (int fd)
|
||||
{
|
||||
return get_seals (fd) & F_SEAL_SEAL;
|
||||
}
|
||||
|
||||
static int
|
||||
do_test (void)
|
||||
{
|
||||
/* Initialized by the first call to memfd_create to 0 (memfd_create
|
||||
unsupported) or 1 (memfd_create is implemented in the kernel).
|
||||
Subsequent iterations check that the success/failure state is
|
||||
consistent. */
|
||||
int supported = -1;
|
||||
|
||||
for (int do_cloexec = 0; do_cloexec < 2; ++do_cloexec)
|
||||
for (int do_sealing = 0; do_sealing < 2; ++do_sealing)
|
||||
{
|
||||
int flags = 0;
|
||||
if (do_cloexec)
|
||||
flags |= MFD_CLOEXEC;
|
||||
if (do_sealing)
|
||||
flags |= MFD_ALLOW_SEALING;
|
||||
if (test_verbose > 0)
|
||||
printf ("info: memfd_create with flags=0x%x\n", flags);
|
||||
int fd = memfd_create ("tst-memfd_create", flags);
|
||||
if (fd < 0)
|
||||
{
|
||||
if (errno == ENOSYS)
|
||||
{
|
||||
if (supported < 0)
|
||||
{
|
||||
printf ("warning: memfd_create is unsupported\n");
|
||||
supported = 0;
|
||||
continue;
|
||||
}
|
||||
TEST_VERIFY (supported == 0);
|
||||
continue;
|
||||
}
|
||||
else
|
||||
FAIL_EXIT1 ("memfd_create: %m");
|
||||
}
|
||||
if (supported < 0)
|
||||
supported = 1;
|
||||
TEST_VERIFY (supported > 0);
|
||||
|
||||
char *fd_path = xasprintf ("/proc/self/fd/%d", fd);
|
||||
char *link = xreadlink (fd_path);
|
||||
if (test_verbose > 0)
|
||||
printf ("info: memfd link: %s\n", link);
|
||||
TEST_VERIFY (strcmp (link, "memfd:tst-memfd_create (deleted)"));
|
||||
TEST_VERIFY (is_cloexec (fd) == do_cloexec);
|
||||
TEST_VERIFY (is_sealed (fd) == !do_sealing);
|
||||
if (do_sealing)
|
||||
{
|
||||
TEST_VERIFY (fcntl (fd, F_ADD_SEALS, F_SEAL_WRITE) == 0);
|
||||
TEST_VERIFY (!is_sealed (fd));
|
||||
TEST_VERIFY (get_seals (fd) & F_SEAL_WRITE);
|
||||
TEST_VERIFY (fcntl (fd, F_ADD_SEALS, F_SEAL_SEAL) == 0);
|
||||
TEST_VERIFY (is_sealed (fd));
|
||||
}
|
||||
xclose (fd);
|
||||
free (fd_path);
|
||||
free (link);
|
||||
}
|
||||
|
||||
if (supported == 0)
|
||||
return EXIT_UNSUPPORTED;
|
||||
return 0;
|
||||
}
|
||||
|
||||
#include <support/test-driver.c>
|
||||
@ -1877,6 +1877,7 @@ GLIBC_2.26 wcstof128_l F
|
||||
GLIBC_2.27 GLIBC_2.27 A
|
||||
GLIBC_2.27 glob F
|
||||
GLIBC_2.27 glob64 F
|
||||
GLIBC_2.27 memfd_create F
|
||||
GLIBC_2.3 GLIBC_2.3 A
|
||||
GLIBC_2.3 __ctype_b_loc F
|
||||
GLIBC_2.3 __ctype_tolower_loc F
|
||||
|
||||
@ -2120,3 +2120,4 @@ GLIBC_2.26 wcstof128_l F
|
||||
GLIBC_2.27 GLIBC_2.27 A
|
||||
GLIBC_2.27 glob F
|
||||
GLIBC_2.27 glob64 F
|
||||
GLIBC_2.27 memfd_create F
|
||||
|
||||
Loading…
Reference in New Issue
Block a user