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| author | Florian Weimer <fweimer@redhat.com> | 2021-02-25 12:10:57 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2021-02-25 12:13:02 +0100 |
| commit | 035c012e32c11e84d64905efaf55e74f704d3668 (patch) | |
| tree | 7b08a9e9cbd8e4dd2e420cd6b7c204aeb5d61ccc /sysdeps/powerpc | |
| parent | a79328c745219dcb395070cdcd3be065a8347f24 (diff) | |
| download | glibc-035c012e32c11e84d64905efaf55e74f704d3668.zip glibc-035c012e32c11e84d64905efaf55e74f704d3668.tar.gz glibc-035c012e32c11e84d64905efaf55e74f704d3668.tar.bz2 | |
Reduce the statically linked startup code [BZ #23323]
It turns out the startup code in csu/elf-init.c has a perfect pair of
ROP gadgets (see Marco-Gisbert and Ripoll-Ripoll, "return-to-csu: A
New Method to Bypass 64-bit Linux ASLR"). These functions are not
needed in dynamically-linked binaries because DT_INIT/DT_INIT_ARRAY
are already processed by the dynamic linker. However, the dynamic
linker skipped the main program for some reason. For maximum
backwards compatibility, this is not changed, and instead, the main
map is consulted from __libc_start_main if the init function argument
is a NULL pointer.
For statically linked binaries, the old approach based on linker
symbols is still used because there is nothing else available.
A new symbol version __libc_start_main@@GLIBC_2.34 is introduced because
new binaries running on an old libc would not run their ELF
constructors, leading to difficult-to-debug issues.
Diffstat (limited to 'sysdeps/powerpc')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/start.S | 4 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc64/start.S | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/sysdeps/powerpc/powerpc32/start.S b/sysdeps/powerpc/powerpc32/start.S index a721a18..39ce1a1 100644 --- a/sysdeps/powerpc/powerpc32/start.S +++ b/sysdeps/powerpc/powerpc32/start.S @@ -52,8 +52,8 @@ L(start_addresses): .long _SDA_BASE_ .long main - .long __libc_csu_init - .long __libc_csu_fini + .long 0 /* Used to be init. */ + .long 0 /* Used to be fini. */ ASM_SIZE_DIRECTIVE(L(start_addresses)) .section ".text" diff --git a/sysdeps/powerpc/powerpc64/start.S b/sysdeps/powerpc/powerpc64/start.S index 612c846..71c0c67 100644 --- a/sysdeps/powerpc/powerpc64/start.S +++ b/sysdeps/powerpc/powerpc64/start.S @@ -53,8 +53,8 @@ L(start_addresses): .quad 0 /* was _SDA_BASE_ but not in 64-bit ABI*/ /* function descriptors so don't need JUMPTARGET */ .quad main - .quad __libc_csu_init - .quad __libc_csu_fini + .quad 0 /* Used to be init. */ + .quad 0 /* Used to be fini. */ ASM_SIZE_DIRECTIVE(L(start_addresses)) |