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mirror of https://sourceware.org/git/glibc.git synced 2025-04-19 01:04:13 +03:00
Adhemerval Zanella 0ca8785a28 elf: Do not change stack permission on dlopen/dlmopen
If some shared library loaded with dlopen/dlmopen requires an executable
stack, either implicitly because of a missing GNU_STACK ELF header
(where the ABI default flags implies in the executable bit) or explicitly
because of the executable bit from GNU_STACK; the loader will try to set
the both the main thread and all thread stacks (from the pthread cache)
as executable.

Besides the issue where any __nptl_change_stack_perm failure does not
undo the previous executable transition (meaning that if the library
fails to load, there can be thread stacks with executable stacks), this
behavior was used on a CVE [1] as a vector for RCE.

This patch changes that if a shared library requires an executable
stack, and the current stack is not executable, dlopen fails.  The
change is done only for dynamically loaded modules, if the program
or any dependency requires an executable stack, the loader will still
change the main thread before program execution and any thread created
with default stack configuration.

[1] https://www.qualys.com/2023/07/19/cve-2023-38408/rce-openssh-forwarded-ssh-agent.txt

Checked on x86_64-linux-gnu and i686-linux-gnu.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
2024-12-31 09:04:20 -03:00

364 lines
6.4 KiB
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%include <time64-compat.h>
libc {
GLIBC_2.0 {
# functions used in inline functions or macros
__cmsg_nxthdr;
# functions used in other libraries
__clone;
# helper functions
__errno_location;
# b*
bdflush;
# c*
clone; create_module;
# d*
delete_module;
# g*
get_kernel_syms; getresgid; getresuid;
# i*
init_module;
# k*
klogctl;
# l*
llseek;
# m*
mremap;
# n*
nfsservctl;
# p*
personality; prctl;
# q*
query_module; quotactl;
# s*
setfsgid; setfsuid;
# s*
setresgid; setresuid; swapoff; swapon; sysctl; sysinfo;
# u*
umount; uselib;
_sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
}
GLIBC_2.1 {
# functions used in inline functions or macros
__libc_sa_len;
# Since we have new signals this structure changed.
_sys_siglist; sys_siglist; sys_sigabbrev;
# New errlist.
_sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
# chown interface change.
chown;
# Change in pthread_attr_t.
pthread_attr_init;
# c*
capget; capset;
# n*
ntp_adjtime; ntp_gettime;
# u*
umount2;
_sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
}
GLIBC_2.2 {
# needed in other libraries.
__endmntent; __getmntent_r; __setmntent; __statfs; __sysctl;
# ipc ctl interface change.
semctl; shmctl; msgctl;
# Old symbol versions from libpthread.
__pread64;
__pwrite64;
lseek64;
open64;
pread;
pread64;
pwrite;
pwrite64;
}
GLIBC_2.2.1 {
# p*
pivot_root;
}
GLIBC_2.3 {
# r*
readahead;
_sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
}
GLIBC_2.3.2 {
# New kernel interfaces.
epoll_create; epoll_ctl; epoll_wait;
}
GLIBC_2.3.3 {
_sys_siglist;
gnu_dev_major;
gnu_dev_makedev;
gnu_dev_minor;
posix_fadvise64;
posix_fallocate64;
sys_sigabbrev;
sys_siglist;
# Changed timer_t. Only used by some 64-bit targets.
timer_create;
timer_delete;
timer_getoverrun;
timer_gettime;
timer_settime;
}
GLIBC_2.3.4 {
sched_getaffinity; sched_setaffinity;
}
GLIBC_2.4 {
inotify_init; inotify_add_watch; inotify_rm_watch;
unshare;
_sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
}
GLIBC_2.5 {
splice; tee; vmsplice;
}
GLIBC_2.6 {
epoll_pwait; sync_file_range; sched_getcpu;
}
GLIBC_2.7 {
eventfd; eventfd_read; eventfd_write; signalfd;
}
GLIBC_2.8 {
timerfd_create; timerfd_settime; timerfd_gettime;
}
GLIBC_2.9 {
epoll_create1; inotify_init1;
}
GLIBC_2.10 {
fallocate;
}
GLIBC_2.11 {
fallocate64;
}
GLIBC_2.12 {
_sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
ntp_gettimex;
recvmmsg;
}
GLIBC_2.13 {
prlimit; prlimit64;
fanotify_init; fanotify_mark;
}
GLIBC_2.14 {
clock_adjtime;
name_to_handle_at; open_by_handle_at;
setns;
sendmmsg;
}
GLIBC_2.15 {
process_vm_readv; process_vm_writev;
}
GLIBC_2.27 {
memfd_create;
mlock2;
pkey_alloc; pkey_free; pkey_set; pkey_get; pkey_mprotect;
}
GLIBC_2.29 {
getcpu;
}
GLIBC_2.30 {
getdents64; gettid; tgkill;
}
GLIBC_2.32 {
}
GLIBC_2.34 {
%ifdef TIME64_NON_DEFAULT
# 64-bit time_t support
__adjtime64;
___adjtimex64;
__aio_suspend_time64;
__clock_adjtime64;
__clock_getres64;
__clock_gettime64;
__clock_nanosleep_time64;
__clock_settime64;
__cnd_timedwait64;
__ctime64;
__ctime64_r;
__difftime64;
__fcntl_time64;
__fstat64_time64;
__fstatat64_time64;
__futimens64;
__futimes64;
__futimesat64;
__fts64_open_time64;
__fts64_close_time64;
__fts64_read_time64;
__fts64_set_time64;
__fts64_children_time64;
__ftw64_time64;
__nftw64_time64;
__gai_suspend_time64;
__getitimer64;
__getrusage64;
__getsockopt64;
__gettimeofday64;
__glob64_time64;
__globfree64_time64;
__gmtime64;
__gmtime64_r;
__ioctl_time64;
__localtime64;
__localtime64_r;
__lstat64_time64;
__lutimes64;
__mktime64;
__mq_timedreceive_time64;
__mq_timedsend_time64;
__msgctl64;
__mtx_timedlock64;
__nanosleep64;
__nanosleep64;
__ntp_gettime64;
__ntp_gettimex64;
__ppoll64;
__prctl_time64;
__pselec64;
__pselect64;
__pthread_clockjoin_np64;
__pthread_cond_clockwait64;
__pthread_cond_timedwait64;
__pthread_mutex_clocklock64;
__pthread_mutex_timedlock64;
__pthread_rwlock_clockrdlock64;
__pthread_rwlock_clockwrlock64;
__pthread_rwlock_timedrdlock64;
__pthread_rwlock_timedwrlock64;
__pthread_timedjoin_np64;
__recvmmsg64;
__recvmsg64;
__sched_rr_get_interval64;
__select64;
__sem_clockwait64;
__semctl64;
__semtimedop64;
__sem_timedwait64;
__sendmmsg64;
__sendmsg64;
__setitimer64;
__setsockopt64;
__settimeofday64;
__shmctl64;
__sigtimedwait64;
__stat64_time64;
__thrd_sleep64;
__time64;
__timegm64;
__timer_gettime64;
__timer_settime64;
__timerfd_gettime64;
__timerfd_settime64;
__timespec_get64;
__timespec_getres64;
__utime64;
__utimensat64;
__utimes64;
__utimes64;
__wait3_time64;
__wait4_time64;
%endif
close_range;
}
GLIBC_2.35 {
%ifdef TIME64_NON_DEFAULT
__epoll_pwait2_time64;
%endif
epoll_pwait2;
}
GLIBC_2.36 {
fsconfig;
fsmount;
fsopen;
fspick;
move_mount;
mount_setattr;
open_tree;
pidfd_open;
pidfd_getfd;
pidfd_send_signal;
process_madvise;
process_mrelease;
}
GLIBC_2.37 {
%ifdef TIME64_NON_DEFAULT
__ppoll64_chk;
%endif
}
GLIBC_2.39 {
pidfd_getpid;
pidfd_spawn;
pidfd_spawnp;
posix_spawnattr_getcgroup_np;
posix_spawnattr_setcgroup_np;
}
GLIBC_2.41 {
sched_getattr;
sched_setattr;
}
GLIBC_PRIVATE {
# functions used in other libraries
__syscall_rt_sigqueueinfo;
__open_nocancel;
__read_nocancel;
__pread64_nocancel;
__close_nocancel;
__sigtimedwait;
# functions used by nscd
__netlink_assert_response;
}
}
librt {
GLIBC_2.3.3 {
# Leftover from the int -> timer_t transition. For ABIs that came later
# and do not have the symbol version, this version node is merged with
# the baseline version.
__librt_version_placeholder;
}
}
ld {
GLIBC_2.35 {
__rseq_flags;
__rseq_offset;
__rseq_size;
}
}