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([2804:1b3:a7c1:1944:b913:6070:fef0:3852]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fed7fbd8d4sm124106725ad.271.2024.07.31.13.03.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 Jul 2024 13:03:17 -0700 (PDT) From: Adhemerval Zanella To: libc-alpha@sourceware.org Cc: Stephen Roettger , Jeff Xu , Florian Weimer , Mike Hommey Subject: [PATCH v2 2/5] linux: Add mseal syscall support Date: Wed, 31 Jul 2024 17:02:05 -0300 Message-ID: <20240731200307.2269811-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240731200307.2269811-1-adhemerval.zanella@linaro.org> References: <20240731200307.2269811-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~patch=linaro.org@sourceware.org It has been added on Linux 6.10 (8be7258aad44b5e25977a98db136f677fa6f4370) as a way to block operations such as mapping, moving to another location, shrinking the size, expanding the size, or modifying it to a pre-existent memory mapping. Although the system only work on 64 bit CPU, the entrypoint was added for all ABIs (since kernel might eventually implement it to additional ones and/or the abi can execute on a 64-bit kernel). Checked on x86_64-linux-gnu. --- NEWS | 4 ++ manual/memory.texi | 66 ++++++++++++++++++ sysdeps/unix/sysv/linux/Makefile | 1 + sysdeps/unix/sysv/linux/Versions | 3 + sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 + sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 + sysdeps/unix/sysv/linux/arc/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 + sysdeps/unix/sysv/linux/bits/mman-shared.h | 8 +++ sysdeps/unix/sysv/linux/csky/libc.abilist | 1 + sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 + sysdeps/unix/sysv/linux/i386/libc.abilist | 1 + sysdeps/unix/sysv/linux/kernel-features.h | 8 +++ .../sysv/linux/loongarch/lp64/libc.abilist | 1 + .../sysv/linux/m68k/coldfire/libc.abilist | 1 + .../unix/sysv/linux/m68k/m680x0/libc.abilist | 1 + .../sysv/linux/microblaze/be/libc.abilist | 1 + .../sysv/linux/microblaze/le/libc.abilist | 1 + .../sysv/linux/mips/mips32/fpu/libc.abilist | 1 + .../sysv/linux/mips/mips64/n32/libc.abilist | 1 + .../sysv/linux/mips/mips64/n64/libc.abilist | 1 + sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 + sysdeps/unix/sysv/linux/or1k/libc.abilist | 1 + .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 + .../powerpc/powerpc32/nofpu/libc.abilist | 1 + .../linux/powerpc/powerpc64/be/libc.abilist | 1 + .../linux/powerpc/powerpc64/le/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv32/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv64/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 + .../sysv/linux/sparc/sparc32/libc.abilist | 1 + .../sysv/linux/sparc/sparc64/libc.abilist | 1 + sysdeps/unix/sysv/linux/syscalls.list | 1 + sysdeps/unix/sysv/linux/tst-mseal.c | 67 +++++++++++++++++++ .../unix/sysv/linux/x86_64/64/libc.abilist | 1 + .../unix/sysv/linux/x86_64/x32/libc.abilist | 1 + 40 files changed, 190 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/tst-mseal.c diff --git a/NEWS b/NEWS index d488874aba..a964ce00a0 100644 --- a/NEWS +++ b/NEWS @@ -25,6 +25,10 @@ Major new features: which is why this mode is not enabled by default. A future version of the library may turn it on by default, however. +* On Linux, the mseal function has been added. It allows to seal memory + mappings to avoid further change during process execution such as protection + permissions, unmapping, moving to another location, or shrinking the size. + Deprecated and removed features, and other changes affecting compatibility: [Add deprecations, removals and changes affecting compatibility here] diff --git a/manual/memory.texi b/manual/memory.texi index 3710d7ec66..0c1b9fc7c2 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -3072,6 +3072,72 @@ process memory, no matter how it was allocated. However, portable use of the function requires that it is only used with memory regions returned by @code{mmap} or @code{mmap64}. +@deftypefun int mseal (void *@var{address}, size_t @var{length}, unsigned long @var{flags}) +@standards{Linux, sys/mman.h} +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} + +A successful call to the @code {mseal} function seals the memory range of +@var{length} bytes, starting at @var{address}. The sealed memory is +protection against further modifictions such as: + +@itemize @bullet +@item +Unmapping, moving to another location, extending or shrinking the size, +via @code{munmap} and @code{mremap}. + +@item +Moving or expanding a different VMA into the current location, via +@code{mremap}. + +@item +Modifying the memory range with @code{mmap} along with flag @code{MAP_FIXED}. + +@item +Expanding the size with @code{mremap}. + +@item +Change the protection flags with @code{mprotect} or @code{pkey_mprotect}. + +@item +Destructive behaviors on anonymous memory, such as @code{madvice} with +@code{MADV_DONTNEED}. +@end itemize + +The @var{address} must be an allocated virtual memory done by @code{mmap} +or @code{mremap}, and it must be page aligned. The end address (@var{address} +plus @var{length}) must be within an allocated virtual memory range. There +should be no unallocated memory between the start and end of address range. + +The @var{flags} is currently ununsed. + +The @code{mseal} function returns @math{0} on sucess and @math{-1} on +failure. + +The following @code{errno} error conditions are defined for this +function: + +@table @code +@item EPERM +The system blocked the operation, and the given address is unmodified +without partion update. This error is also returned when @code{mseal} +is issued on a 32 bit CPUs (the sealing is currently supported only on +64-bit CPUs, although 32 bit binaries running on 64 bit kernel is +supported). + +@item ENOMEM +Either the @var{address} is not allocated, or the end address is not +allocation, or there is an unallocated memory between start and end address. + +@item ENOSYS +The kernel does not support the @code{mseal} syscall. + +@strong{NB:} The memory sealing changes the lifetime of a mapping, where the +sealing memory could not be unmapped until the process terminates or starts +another one through @code{execve} function. + +@end table +@end deftypefun + @subsection Memory Protection Keys @cindex memory protection key diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index 097b5a26fc..9e57621720 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -210,6 +210,7 @@ tests += \ tst-misalign-clone \ tst-mlock2 \ tst-mount \ + tst-mseal \ tst-ntp_adjtime \ tst-ntp_gettime \ tst-ntp_gettimex \ diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions index 268ba1b6ac..162d07002b 100644 --- a/sysdeps/unix/sysv/linux/Versions +++ b/sysdeps/unix/sysv/linux/Versions @@ -328,6 +328,9 @@ libc { posix_spawnattr_getcgroup_np; posix_spawnattr_setcgroup_np; } + GLIBC_2.41 { + mseal; + } 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 68eeca1c08..5f93f5664e 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2748,3 +2748,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index 34c187b721..191dfb973a 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -3095,6 +3095,7 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist index 916c18ea94..c81fa573b2 100644 --- a/sysdeps/unix/sysv/linux/arc/libc.abilist +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist @@ -2509,3 +2509,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist index ea95de282a..5dfd3f239b 100644 --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist @@ -2801,6 +2801,7 @@ GLIBC_2.4 xdrstdio_create F GLIBC_2.4 xencrypt F GLIBC_2.4 xprt_register F GLIBC_2.4 xprt_unregister F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist index 1cdbc983e1..381a48296e 100644 --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist @@ -2798,6 +2798,7 @@ GLIBC_2.4 xdrstdio_create F GLIBC_2.4 xencrypt F GLIBC_2.4 xprt_register F GLIBC_2.4 xprt_unregister F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/bits/mman-shared.h b/sysdeps/unix/sysv/linux/bits/mman-shared.h index d8ed4436b6..2681218cf9 100644 --- a/sysdeps/unix/sysv/linux/bits/mman-shared.h +++ b/sysdeps/unix/sysv/linux/bits/mman-shared.h @@ -80,6 +80,14 @@ int pkey_free (int __key) __THROW; range. */ int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW; +/* Seal the address range to avoid further modifications, such as remmap to + shrink or expand the VMA, change protection permission with mprotect, + unmap with munmap, destructive semantic such madvise with MADV_DONTNEED. + The address range must be valid VMA, withouth any gap (unallocated memory) + between start and end, and ADDR much be page aligned (LEN will be page + aligned implicitly). */ +int mseal (void *__addr, size_t __len, unsigned long flags) __THROW; + __END_DECLS #endif /* __USE_GNU */ diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist index 96d45961e2..82dbff8090 100644 --- a/sysdeps/unix/sysv/linux/csky/libc.abilist +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist @@ -2785,3 +2785,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index fbcd60c2b3..e4565fe4a8 100644 --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist @@ -2821,6 +2821,7 @@ GLIBC_2.4 sys_errlist D 0x400 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index c989b433c0..7f7d37997a 100644 --- a/sysdeps/unix/sysv/linux/i386/libc.abilist +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist @@ -3005,6 +3005,7 @@ GLIBC_2.4 sys_errlist D 0x210 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index a25cf07e9f..b9038d18bf 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -257,4 +257,12 @@ # define __ASSUME_FCHMODAT2 0 #endif +/* The mseal system call was introduced across all architectures in Linux 6.10 + (although only supported on 64-bit CPUs). */ +#if __LINUX_KERNEL_VERSION >= 0x060A00 +# define __ASSUME_MSEAL 1 +#else +# define __ASSUME_MSEAL 0 +#endif + #endif /* kernel-features.h */ diff --git a/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist b/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist index 0023ec1fa1..347f6de473 100644 --- a/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist +++ b/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist @@ -2269,3 +2269,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist index d9bd6a9b56..85d0667ecf 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist @@ -2781,6 +2781,7 @@ GLIBC_2.4 xdrstdio_create F GLIBC_2.4 xencrypt F GLIBC_2.4 xprt_register F GLIBC_2.4 xprt_unregister F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index 439796d693..4edb1857da 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist @@ -2948,6 +2948,7 @@ GLIBC_2.4 sys_errlist D 0x210 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist index 1069d3252c..31cb00633a 100644 --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist @@ -2834,3 +2834,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist index 17abe08c8b..f13a2cf501 100644 --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist @@ -2831,3 +2831,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index 799e508950..c9882d829a 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist @@ -2909,6 +2909,7 @@ GLIBC_2.4 renameat F GLIBC_2.4 symlinkat F GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index 03d9655f26..c9d94c2892 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist @@ -2915,6 +2915,7 @@ GLIBC_2.4 renameat F GLIBC_2.4 symlinkat F GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index 05e402ed30..5b30761894 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist @@ -2817,6 +2817,7 @@ GLIBC_2.4 renameat F GLIBC_2.4 symlinkat F GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist index 3aa81766aa..8e17cf707b 100644 --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist @@ -2873,3 +2873,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/or1k/libc.abilist b/sysdeps/unix/sysv/linux/or1k/libc.abilist index 959e59e7e7..bb62db6df5 100644 --- a/sysdeps/unix/sysv/linux/or1k/libc.abilist +++ b/sysdeps/unix/sysv/linux/or1k/libc.abilist @@ -2259,3 +2259,4 @@ GLIBC_2.40 getcontext F GLIBC_2.40 makecontext F GLIBC_2.40 setcontext F GLIBC_2.40 swapcontext F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index 9714305608..627d67d5f8 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist @@ -3138,6 +3138,7 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist index 0beb52c542..9ee68a3f78 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist @@ -3183,6 +3183,7 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist index cfc2ebd3ec..287a87e1db 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist @@ -2892,6 +2892,7 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist index 8c9efc5a16..c5c4b20852 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist @@ -2968,3 +2968,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist index 6397a9cb91..933037c9de 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist @@ -2512,3 +2512,4 @@ GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F GLIBC_2.40 __riscv_hwprobe F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist index 71bbf94f66..4692879639 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist @@ -2712,3 +2712,4 @@ GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F GLIBC_2.40 __riscv_hwprobe F +GLIBC_2.41 mseal F diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index a7467e2850..a809ce580a 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist @@ -3136,6 +3136,7 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index fd1cb2972d..5c0232c9df 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist @@ -2929,6 +2929,7 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist index ff6e6b1a13..d6fcb949b9 100644 --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist @@ -2828,6 +2828,7 @@ GLIBC_2.4 sys_errlist D 0x210 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist index 449d92bbc5..e02fdee7c4 100644 --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist @@ -2825,6 +2825,7 @@ GLIBC_2.4 sys_errlist D 0x210 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index e615be759a..cd5d95f771 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist @@ -3157,6 +3157,7 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index bd36431dd7..d27bcb7c5e 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist @@ -2793,6 +2793,7 @@ GLIBC_2.4 sys_errlist D 0x430 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list index 9ac42c3436..00ebceb574 100644 --- a/sysdeps/unix/sysv/linux/syscalls.list +++ b/sysdeps/unix/sysv/linux/syscalls.list @@ -39,6 +39,7 @@ mlockall - mlockall i:i mlockall mount EXTRA mount i:sssUp __mount mount mount_setattr EXTRA mount_setattr i:isUpU mount_setattr move_mount EXTRA move_mount i:isisU move_mount +mseal EXTRA mseal i:bUU __mseal mseal munlock - munlock i:aU munlock munlockall - munlockall i: munlockall nfsservctl EXTRA nfsservctl i:ipp __compat_nfsservctl nfsservctl@GLIBC_2.0:GLIBC_2.28 diff --git a/sysdeps/unix/sysv/linux/tst-mseal.c b/sysdeps/unix/sysv/linux/tst-mseal.c new file mode 100644 index 0000000000..dfed57411e --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-mseal.c @@ -0,0 +1,67 @@ +/* Basic tests for mseal. + Copyright (C) 2024 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 + . */ + +#include +#include +#include +#include + +static int +do_test (void) +{ + TEST_VERIFY_EXIT (mseal (MAP_FAILED, 0, 0) == -1); + if (errno == ENOSYS) + FAIL_UNSUPPORTED ("kernel does not support mseal"); + TEST_COMPARE (errno, EINVAL); + + size_t pagesize = getpagesize (); + void *p = xmmap (NULL, 4 * pagesize, PROT_READ, + MAP_ANONYMOUS | MAP_PRIVATE, -1); + xmunmap (p + 2 * pagesize, pagesize); + + /* Unaligned address. */ + TEST_VERIFY_EXIT (mseal (p + 1, pagesize, 0) == -1); + TEST_COMPARE (errno, EINVAL); + + /* Length too big. */ + TEST_VERIFY_EXIT (mseal (p, 3 * pagesize, 0) == -1); + TEST_COMPARE (errno, ENOMEM); + + TEST_VERIFY_EXIT (mseal (p, pagesize, 0) == 0); + /* Apply the same seal should be idempotent. */ + TEST_VERIFY_EXIT (mseal (p, pagesize, 0) == 0); + + TEST_VERIFY_EXIT (mprotect (p, pagesize, PROT_WRITE) == -1); + TEST_COMPARE (errno, EPERM); + + TEST_VERIFY_EXIT (munmap (p, pagesize) == -1); + TEST_COMPARE (errno, EPERM); + + TEST_VERIFY_EXIT (mremap (p, pagesize, 2 * pagesize, 0) == MAP_FAILED); + TEST_COMPARE (errno, EPERM); + + TEST_VERIFY_EXIT (madvise (p, pagesize, MADV_DONTNEED) == -1); + TEST_COMPARE (errno, EPERM); + + xmunmap (p + pagesize, pagesize); + xmunmap (p + 3 * pagesize, pagesize); + + return 0; +} + +#include diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist index aea7848ed6..8b72a917a9 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist @@ -2744,6 +2744,7 @@ GLIBC_2.4 sys_errlist D 0x420 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 mseal F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index 4ab3681914..9a72854f8c 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -2763,3 +2763,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 mseal F