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Support new memfd_secret linux syscall (447)

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memfd_secret is a new syscall in linux 5.14. memfd_secret() is
disabled by default and a command-line option needs to be added to
enable it at boot time.

$ cat /proc/cmdline
[...] secretmem.enable=y

https://bugs.kde.org/451878
https://lwn.net/Articles/865256/
This commit is contained in:
Di Chen 2022-04-15 00:08:17 +08:00 committed by Mark Wielaard
parent 9c9fd9ae24
commit fca4a3d8e5
6 changed files with 29 additions and 0 deletions
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3
coregrind/m_syswrap/priv_syswrap-linux.h
View File

@ -323,6 +323,9 @@ DECL_TEMPLATE(linux, sys_io_uring_register);
// Linux-specific (new in Linux 5.9)
DECL_TEMPLATE(linux, sys_close_range);
// Linux-specific (new in Linux 5.14)
DECL_TEMPLATE(linux, sys_memfd_secret);
/* ---------------------------------------------------------------------
Wrappers for sockets and ipc-ery. These are split into standalone
procedures because x86-linux hides them inside multiplexors

2
coregrind/m_syswrap/syswrap-amd64-linux.c
View File

@ -880,6 +880,8 @@ static SyscallTableEntry syscall_table[] = {
LINXY(__NR_close_range, sys_close_range), // 436
LINX_(__NR_faccessat2, sys_faccessat2), // 439
LINXY(__NR_memfd_secret, sys_memfd_secret), // 447
};
SyscallTableEntry* ML_(get_linux_syscall_entry) ( UInt sysno )

2
coregrind/m_syswrap/syswrap-arm64-linux.c
View File

@ -835,6 +835,8 @@ static SyscallTableEntry syscall_main_table[] = {
LINXY(__NR_close_range, sys_close_range), // 436
LINX_(__NR_faccessat2, sys_faccessat2), // 439
LINXY(__NR_memfd_secret, sys_memfd_secret), // 447
};

18
coregrind/m_syswrap/syswrap-linux.c
View File

@ -4116,6 +4116,24 @@ POST(sys_memfd_create)
}
}
PRE(sys_memfd_secret)
{
PRINT("sys_memfd_secret ( %#" FMT_REGWORD "x )", ARG1);
PRE_REG_READ1(int, "memfd_secret", unsigned int, flags);
}
POST(sys_memfd_secret)
{
vg_assert(SUCCESS);
if (!ML_(fd_allowed)(RES, "memfd_secret", tid, True)) {
VG_(close)(RES);
SET_STATUS_Failure( VKI_EMFILE );
} else {
if (VG_(clo_track_fds))
ML_(record_fd_open_nameless)(tid, RES);
}
}
PRE(sys_membarrier)
{
PRINT("sys_membarrier ( %#" FMT_REGWORD "x )", ARG1);

2
coregrind/m_syswrap/syswrap-x86-linux.c
View File

@ -1651,6 +1651,8 @@ static SyscallTableEntry syscall_table[] = {
LINXY(__NR_close_range, sys_close_range), // 436
LINX_(__NR_faccessat2, sys_faccessat2), // 439
LINXY(__NR_memfd_secret, sys_memfd_secret), // 447
};
SyscallTableEntry* ML_(get_linux_syscall_entry) ( UInt sysno )

2
include/vki/vki-scnums-shared-linux.h
View File

@ -44,4 +44,6 @@
#define __NR_faccessat2 439
#define __NR_memfd_secret 447
#endif