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Merge pull request #2698 from cyphar/memfd_create-hardcode-sysnum

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nsenter: hard-code memfd_create(2) syscall numbers
This commit is contained in:
Akihiro Suda
2020-12-03 12:01:21 +09:00
committed by GitHub
parent 56a1f1f70f 3aead32ea2
commit bd013b6e4d
1 changed files with 26 additions and 2 deletions
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libcontainer/nsenter/cloned_binary.c
+26 -2
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@@ -59,14 +59,38 @@
#include <sys/syscall.h>
/* Use our own wrapper for memfd_create. */
#if !defined(SYS_memfd_create) && defined(__NR_memfd_create)
# define SYS_memfd_create __NR_memfd_create
#ifndef SYS_memfd_create
# ifdef __NR_memfd_create
# define SYS_memfd_create __NR_memfd_create
# else
/* These values come from <https://fedora.juszkiewicz.com.pl/syscalls.html>. */
# warning "libc is outdated -- using hard-coded SYS_memfd_create"
# if defined(__x86_64__) // x86_64
# define SYS_memfd_create 319
# elif defined(__i386__) // i386
# define SYS_memfd_create 356
# elif defined(__ia64__) // ia64
# define SYS_memfd_create 1340
# elif defined(__arm__) // arm
# define SYS_memfd_create 385
# elif defined(__aarch64__) // arm64
# define SYS_memfd_create 279
# elif defined(__ppc__) || defined(__ppc64__) // ppc + ppc64
# define SYS_memfd_create 360
# elif defined(__s390__) || defined(__s390x__) // s390(x)
# define SYS_memfd_create 350
# else
# error "unknown architecture -- cannot hard-code SYS_memfd_create"
# endif
# endif
#endif
/* memfd_create(2) flags -- copied from <linux/memfd.h>. */
#ifndef MFD_CLOEXEC
# define MFD_CLOEXEC 0x0001U
# define MFD_ALLOW_SEALING 0x0002U
#endif
int memfd_create(const char *name, unsigned int flags)
{
#ifdef SYS_memfd_create