From 8c2f6218f81ab5303e07bad4e13f181aa9581d92 Mon Sep 17 00:00:00 2001 From: Pavel Kozlov Date: Tue, 17 Oct 2023 14:01:22 +0400 Subject: setrlimit/getrlimit: fix prlimit64 syscall use for 32-bit CPUs Commit 95e38b37 ("add support for systems without legacy setrlimit/getrlimit syscalls") has added use of the prlimit64 syscall in getrlimit and setrlimit functions. This change causes memory corruption on getrlimit call for 32-bit CPUs like ARC, as ARC doesn't have ugetrlimit syscall and uses prlimit64. Also, setrlimit has been broken by prlimit64 call on 32-bit CPUs like, i386, ARM, ARC. For the prlimit64 syscall the kernel expects an rlimit struct with 64-bit fields, but on 32-bit CPUs without _FILE_OFFSET_BITS=64 the struct rlimit has 32-bit fields. Add safe implementations of getrlimit, setrlimit, prlimit for 32-bit CPUs with a local struct rlimit64 variable for use in the prlimit64 syscall. For 64-bit CPUs and configurations with _FILE_OFFSET_BITS=64 use getrlimit, setrlimit, prlimit as aliases to getrlimit64, setrlimit64 and prlimit64. Add a new function prlimit64. Tested on aarch64, arm, i386, arc. Fixes: 95e38b37 ("add support for systems without legacy setrlimit/getrlimit syscalls") Signed-off-by: Pavel Kozlov --- libc/sysdeps/linux/common/prlimit64.c | 36 +++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 libc/sysdeps/linux/common/prlimit64.c (limited to 'libc/sysdeps/linux/common/prlimit64.c') diff --git a/libc/sysdeps/linux/common/prlimit64.c b/libc/sysdeps/linux/common/prlimit64.c new file mode 100644 index 000000000..6f57b939e --- /dev/null +++ b/libc/sysdeps/linux/common/prlimit64.c @@ -0,0 +1,36 @@ +/* Copyright (C) 2023 uClibc-ng + * An prlimit64() - get/set resource limits Linux specific syscall. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This 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 + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, see + * . + */ + +#include +#include + +#if defined(__NR_prlimit64) + +int +prlimit64 (__pid_t pid, enum __rlimit_resource resource, + const struct rlimit64 *new_rlimit, struct rlimit64 *old_rlimit) +{ + return INLINE_SYSCALL (prlimit64, 4, pid, resource, new_rlimit, + old_rlimit); +} + +# if __WORDSIZE == 64 || defined (__USE_FILE_OFFSET64) +strong_alias_untyped(prlimit64, prlimit) +# endif + +#endif \ No newline at end of file -- cgit v1.2.3