[v4,1/9] linux: Add mseal syscall support

Message ID	20241206173850.3766841-2-adhemerval.zanella@linaro.org
State	New
Headers	show Delivered-To: patch@linaro.org Received-SPF: pass (google.com: domain of libc-alpha-bounces~patch=linaro.org@sourceware.org designates 8.43.85.97 as permitted sender) client-ip=8.43.85.97; DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 3AE1A3858410 From: Adhemerval Zanella <adhemerval.zanella@linaro.org> To: libc-alpha@sourceware.org Cc: Jeff Xu <jeffxu@google.com>, Florian Weimer <fweimer@redhat.com>, Mike Hommey <mh@glandium.org>, "H . J . Lu" <hjl.tools@gmail.com> Subject: [PATCH v4 1/9] linux: Add mseal syscall support Date: Fri, 6 Dec 2024 14:37:49 -0300 Message-ID: <20241206173850.3766841-2-adhemerval.zanella@linaro.org> In-Reply-To: <20241206173850.3766841-1-adhemerval.zanella@linaro.org> References: <20241206173850.3766841-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: list Errors-To: libc-alpha-bounces~patch=linaro.org@sourceware.org
Series	Add support for memory sealing \| expand [v4,0/9] Add support for memory sealing [v4,1/9] linux: Add mseal syscall support [v4,2/9] elf: Parse gnu properties for static linked binaries [v4,3/9] elf: Parse gnu properties for the loader [v4,4/9] rtld: Move call_init_paths after _dl_process_pt_gnu_property [v4,5/9] elf: Use RTLD_NODELETE for dependencies [v4,6/9] elf: Add support to memory sealing [v4,7/9] Enable memory sealing automatically [v4,8/9] linux: Add memory sealing tests [v4,9/9] elf: Add glibc.rtld.seal tunable

diff --git a/NEWS b/NEWS index 55b74436ab..d65eaeadf7 100644 --- a/NEWS +++ b/NEWS @@ -45,6 +45,10 @@ Major new features: liable to change. Features from C2Y are also enabled by _GNU_SOURCE, or by compiling with "gcc -std=gnu2y". +* 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: * The big-endian ARC port (arceb-linux-gnu) has been removed. diff --git a/manual/memory.texi b/manual/memory.texi index dc4621e2c5..9e902bc67e 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 eb9c697ce5..a270b0af4c 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -213,6 +213,7 @@ 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 213ff5f1fe..194c9a47d7 100644 --- a/sysdeps/unix/sysv/linux/Versions +++ b/sysdeps/unix/sysv/linux/Versions @@ -331,6 +331,7 @@ libc { GLIBC_2.41 { sched_getattr; sched_setattr; + mseal; } GLIBC_PRIVATE { # functions used in other libraries diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index 38db77e4f7..ca2b42339a 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2748,5 +2748,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index 637bfce9fb..e385da44c7 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist index 4a305cf730..499e48c8b1 100644 --- a/sysdeps/unix/sysv/linux/arc/libc.abilist +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist @@ -2509,5 +2509,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist index 1d54f71b14..e9ccb8abb0 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist index ff7e8bc40b..5f551a3548 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/bits/mman-shared.h b/sysdeps/unix/sysv/linux/bits/mman-shared.h index 7a9874204d..0cd072e235 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 c3ed65467d..50239f275f 100644 --- a/sysdeps/unix/sysv/linux/csky/libc.abilist +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist @@ -2785,5 +2785,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index 8de7644a59..46a7db3e07 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index 4fedf775d4..9b86da3a98 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk 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 0024282289..9b617ed24b 100644 --- a/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist +++ b/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist @@ -2269,5 +2269,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist index 142595eb3e..c3308f3d70 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index 85e7746c10..1da35d9cdc 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist index 91dc1b8378..acf4a194f3 100644 --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist @@ -2834,5 +2834,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist index 3440e90f6f..72f69dee89 100644 --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist @@ -2831,5 +2831,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index 5ee7b8c52f..f31d29add6 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index ae7474c0f0..57df1a30cc 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index cdf040dec2..808d11899f 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/or1k/libc.abilist b/sysdeps/unix/sysv/linux/or1k/libc.abilist index c356a11b1c..e172e3f1eb 100644 --- a/sysdeps/unix/sysv/linux/or1k/libc.abilist +++ b/sysdeps/unix/sysv/linux/or1k/libc.abilist @@ -2259,5 +2259,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index 7937f94cf0..05390d9b14 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist index d6e35f31d2..8ab5bed681 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist index 2268d6890d..cd025a4593 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist index 7f61b14bc8..e0b47be0e1 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist @@ -2968,5 +2968,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist index 4187241f50..1a8affb9b7 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist @@ -2512,5 +2512,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist index 8935beccac..ef38afe23e 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist @@ -2712,5 +2712,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index e69dc7ccf6..01067f7be1 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index 7d860001d8..6223ecbdb2 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist index fcb8161841..ad5fbff8cd 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist index 3fd078d125..fb16b94525 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index 1ce1fe9da7..af231e9ae5 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index 07507b86f6..45a0b0463f 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list index f1cfe8dc13..424bf43868 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..95637f1377 --- /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 + <https://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <sys/mman.h> +#include <support/check.h> +#include <support/xunistd.h> + +static int +do_test (void) +{ + TEST_VERIFY_EXIT (mseal (MAP_FAILED, 0, 0) == -1); + if (errno == ENOSYS || errno == EPERM) + 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 <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 5acf49dbe8..41964726bb 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_2.41 sched_getattr F GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index 02d1bb97dc..3b05723239 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -2763,5 +2763,6 @@ 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 GLIBC_2.41 sched_getattr F GLIBC_2.41 sched_setattr F

[v4,1/9] linux: Add mseal syscall support

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Patch