diff options
36 files changed, 249 insertions, 1 deletions
@@ -1,3 +1,17 @@ +2017-11-23 Florian Weimer <fweimer@redhat.com> + + Linux: Add memfd_create system call wrapper + * sysdeps/unix/sysv/linux/Makefile [misc] (tests): Add + tst-memfd_create. + * sysdeps/unix/sysv/linux/bits/mman-linux.h [__USE_GNU] + (MFD_CLOEXEC, MFD_ALLOW_SEALING): Define. + [__USE_GNU] (memfd_create): Declare. + * sysdeps/unix/sysv/linux/Versions (GLIBC_2.27): Add memfd_create. + * sysdeps/unix/sysv/linux/syscalls.list (memfd_create): Add. + * sysdeps/unix/sysv/linux/tst-memfd_create.c: New file. + * sysdeps/unix/sysv/linux/**.abilist: Update. + * manual/llio.texi (Memory-mapped I/O): Document memfd_create. + 2017-11-22 Joseph Myers <joseph@codesourcery.com> * localedata/gen-locale.sh: Fix typo in variable name. @@ -35,6 +35,8 @@ Major new features: are the same interfaces added in version 2.26 for some platforms where this format is supported but is not the format of long double. +* glibc now implements the memfd_create function on Linux. + Deprecated and removed features, and other changes affecting compatibility: * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer diff --git a/manual/llio.texi b/manual/llio.texi index 41c3e06..8b2f599 100644 --- a/manual/llio.texi +++ b/manual/llio.texi @@ -1801,6 +1801,69 @@ the given @var{name} previously created by @code{shm_open}. On failure @code{errno} is set. @end deftypefn +@deftypefun int memfd_create (const char *@var{name}, unsigned int @var{flags}) +@standards{Linux, sys/mman.h} +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{@acsfd{}}} +The @code{memfd_create} function returns a file descriptor which can be +used to create memory mappings using the @code{mmap} function. It is +similar to the @code{shm_open} function in the sense that these mappings +are not backed by actual files. However, the descriptor returned by +@code{memfd_create} does not correspond to a named object; the +@var{name} argument is used for debugging purposes only (e.g., will +appear in @file{/proc}), and separate invocations of @code{memfd_create} +with the same @var{name} will not return descriptors for the same region +of memory. The descriptor can also be used to create alias mappings +within the same process. + +The descriptor initially refers to a zero-length file. Before mappings +can be created which are backed by memory, the file size needs to be +increased with the @code{ftruncate} function. @xref{File Size}. + +The @var{flags} argument can be a combination of the following flags: + +@vtable @code +@item MFD_CLOEXEC +@standards{Linux, sys/mman.h} +The descriptor is created with the @code{O_CLOEXEC} flag. + +@item MFD_ALLOW_SEALING +@standards{Linux, sys/mman.h} +The descriptor supports the addition of seals using the @code{fcntl} +function. + +@item MFD_HUGETLB +@standards{Linux, sys/mman.h} +This requests that mappings created using the returned file descriptor +use a larger page size. See @code{MAP_HUGETLB} above for details. + +This flag is incompatible with @code{MFD_ALLOW_SEALING}. +@end vtable + +@code{memfd_create} returns a file descriptor on success, and @math{-1} +on failure. + +The following @code{errno} error conditions are defined for this +function: + +@table @code +@item EINVAL +An invalid combination is specified in @var{flags}, or @var{name} is +too long. + +@item EFAULT +The @var{name} argument does not point to a string. + +@item EMFILE +The operation would exceed the file descriptor limit for this process. + +@item ENFILE +The operation would exceed the system-wide file descriptor limit. + +@item ENOMEM +There is not enough memory for the operation. +@end table +@end deftypefun + @node Waiting for I/O @section Waiting for Input or Output @cindex waiting for input or output diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index c6675b3..c484d26 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -44,7 +44,7 @@ sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \ tst-quota tst-sync_file_range tst-sysconf-iov_max tst-ttyname \ - test-errno-linux + test-errno-linux tst-memfd_create # Generate the list of SYS_* macros for the system calls (__NR_* # macros). The file syscall-names.list contains all possible system diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions index d3dbcde..6f2fe51 100644 --- a/sysdeps/unix/sysv/linux/Versions +++ b/sysdeps/unix/sysv/linux/Versions @@ -166,6 +166,9 @@ libc { GLIBC_2.15 { process_vm_readv; process_vm_writev; } + GLIBC_2.27 { + memfd_create; + } GLIBC_PRIVATE { # functions used in other libraries __syscall_rt_sigqueueinfo; diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index ed598ae..140ca28 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2106,6 +2106,7 @@ GLIBC_2.26 reallocarray 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_2.27 strfromf128 F GLIBC_2.27 strtof128 F GLIBC_2.27 strtof128_l F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index 4e57f36..f698e1b 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -2017,6 +2017,7 @@ GLIBC_2.26 reallocarray 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_2.27 strfromf128 F GLIBC_2.27 strtof128 F GLIBC_2.27 strtof128_l F diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist index 5b70e1b..8a8af3e 100644 --- a/sysdeps/unix/sysv/linux/arm/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/libc.abilist @@ -107,6 +107,7 @@ GLIBC_2.26 reallocarray 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_2.4 GLIBC_2.4 A GLIBC_2.4 _Exit F GLIBC_2.4 _IO_2_1_stderr_ D 0xa0 diff --git a/sysdeps/unix/sysv/linux/bits/mman-linux.h b/sysdeps/unix/sysv/linux/bits/mman-linux.h index 78c07c8..1ffa549 100644 --- a/sysdeps/unix/sysv/linux/bits/mman-linux.h +++ b/sysdeps/unix/sysv/linux/bits/mman-linux.h @@ -111,3 +111,19 @@ # define MCL_ONFAULT 4 /* Lock all pages that are faulted in. */ #endif + +#ifdef __USE_GNU +/* Flags for memfd_create. */ +# define MFD_CLOEXEC 1U +# define MFD_ALLOW_SEALING 2U +# define MFD_HUGETLB 4U + +__BEGIN_DECLS + +/* Create a new memory file descriptor. NAME is a name for debugging. + FLAGS is a combination of the MFD_* constants. */ +int memfd_create (const char *__name, unsigned int __flags) __THROW; + +__END_DECLS + +#endif /* __USE_GNU */ diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index 6a2500a..5b81a6c 100644 --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist @@ -1871,6 +1871,7 @@ GLIBC_2.26 reallocarray 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 diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index 9ab4e36..51ead9e 100644 --- a/sysdeps/unix/sysv/linux/i386/libc.abilist +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist @@ -2036,6 +2036,7 @@ 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 diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist index 81bb623..78b4ee8 100644 --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist @@ -1900,6 +1900,7 @@ 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 diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist index 5a33b57..d9c9777 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist @@ -108,6 +108,7 @@ GLIBC_2.26 reallocarray 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_2.4 GLIBC_2.4 A GLIBC_2.4 _Exit F GLIBC_2.4 _IO_2_1_stderr_ D 0x98 diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index 50a86e7..4acbf7e 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist @@ -1985,6 +1985,7 @@ GLIBC_2.26 reallocarray 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 diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist index 250ef30..93f02f0 100644 --- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist @@ -2106,3 +2106,4 @@ GLIBC_2.26 reallocarray F GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F +GLIBC_2.27 memfd_create F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index 87a1dc4..795e85d 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist @@ -1960,6 +1960,7 @@ GLIBC_2.26 reallocarray 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 diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist index f2b35f2..dc71405 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist @@ -1958,6 +1958,7 @@ GLIBC_2.26 reallocarray 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 diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index ade654d..ce7bc9b 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist @@ -1956,6 +1956,7 @@ GLIBC_2.26 reallocarray 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_2.27 strfromf128 F GLIBC_2.27 strtof128 F GLIBC_2.27 strtof128_l F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index 56032c3..3fdd85e 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist @@ -1951,6 +1951,7 @@ GLIBC_2.26 reallocarray 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_2.27 strfromf128 F GLIBC_2.27 strtof128 F GLIBC_2.27 strtof128_l F diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist index c599dd9..3e0bcb2 100644 --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist @@ -2147,3 +2147,4 @@ GLIBC_2.26 reallocarray F GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F +GLIBC_2.27 memfd_create F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index 385409a..375c69d 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist @@ -1989,6 +1989,7 @@ GLIBC_2.26 reallocarray 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 diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist index e99cb45..a88172a 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist @@ -1994,6 +1994,7 @@ GLIBC_2.26 reallocarray 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 diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist index 173672a..fa026a3 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist @@ -2201,3 +2201,4 @@ 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 diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist index 8a65443..838f395 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist @@ -108,6 +108,7 @@ GLIBC_2.26 reallocarray 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 _Exit F GLIBC_2.3 _IO_2_1_stderr_ D 0xe0 diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index dbd411c..41b79c4 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist @@ -1989,6 +1989,7 @@ GLIBC_2.26 reallocarray 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_2.27 strfromf128 F GLIBC_2.27 strtof128 F GLIBC_2.27 strtof128_l F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index 5617784..68251a0 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist @@ -1890,6 +1890,7 @@ GLIBC_2.26 reallocarray 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_2.27 strfromf128 F GLIBC_2.27 strtof128 F GLIBC_2.27 strtof128_l F diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist index 0f840e6..bc1aae2 100644 --- a/sysdeps/unix/sysv/linux/sh/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/libc.abilist @@ -1875,6 +1875,7 @@ GLIBC_2.26 reallocarray 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 diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index bb7e104..93e6d09 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist @@ -1982,6 +1982,7 @@ GLIBC_2.26 reallocarray 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_2.27 strfromf128 F GLIBC_2.27 strtof128 F GLIBC_2.27 strtof128_l F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index 4053b0a..b11d676 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist @@ -1919,6 +1919,7 @@ GLIBC_2.26 reallocarray 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_2.27 strfromf128 F GLIBC_2.27 strtof128 F GLIBC_2.27 strtof128_l F diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list index 8bfb080..40c4fbb 100644 --- a/sysdeps/unix/sysv/linux/syscalls.list +++ b/sysdeps/unix/sysv/linux/syscalls.list @@ -109,3 +109,4 @@ setns EXTRA setns i:ii setns process_vm_readv EXTRA process_vm_readv i:ipipii process_vm_readv process_vm_writev EXTRA process_vm_writev i:ipipii process_vm_writev +memfd_create EXTRA memfd_create i:si memfd_create diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist index 38a96d3..e9eb4ff 100644 --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist @@ -2113,3 +2113,4 @@ GLIBC_2.26 reallocarray F GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F +GLIBC_2.27 memfd_create F diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist index 572b917..8f08e90 100644 --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist @@ -2113,3 +2113,4 @@ GLIBC_2.26 reallocarray F GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F +GLIBC_2.27 memfd_create F diff --git a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist index 38a96d3..e9eb4ff 100644 --- a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist +++ b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist @@ -2113,3 +2113,4 @@ GLIBC_2.26 reallocarray F GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F +GLIBC_2.27 memfd_create F diff --git a/sysdeps/unix/sysv/linux/tst-memfd_create.c b/sysdeps/unix/sysv/linux/tst-memfd_create.c new file mode 100644 index 0000000..fd173ff --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-memfd_create.c @@ -0,0 +1,121 @@ +/* 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> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist index b83d25c..0a4f779 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist @@ -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 diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index cba1d59..23f6a91 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -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 |