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clang defaulted to -fomit-frame-pointer when optimizing PowerPC code
for Linux and NetBSD. Now do it for all systems, including OpenBSD.
This affects both 32-bit and powerpc64 code.
ok kettenis@
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Add these options from gcc to clang:
-maix-struct-return # return all structs in memory
-msvr4-struct-return # return small structs in r3/r4
ok mortimer@ jca@ deraadt@
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For this architecture we use separate retguard prologue and epilogue code
for static or PIC code. In the PIC case we use some additional code before
the retguard epilogue to recover the function start address and the GOT
pointer in order to get the per-function random cookie. Much thanks to
visa@ for suggestions and advice making it all work.
ok deraadt@ visa@
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Tested in snaps and package builds
Tested on amd64 by naddy@
Tested on arm64 by patrick@
Tested on octeon by visa@
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Prepared with help from jsg@ and mortimer@
Tested on amd64 by bcallah@, krw@, naddy@
Tested on arm64 by patrick@
Tested on macppc by kettenis@
Tested on octeon by visa@
Tested on sparc64 by claudio@
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it will be there.
problem found by naddy@, "heck yeah" kettenis@
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enabled.
ok visa@
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stack protector. Fixes 'unused arguments' warning when this argument is
given.
Noticed by robert@, ok robert@
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are close to release, so punt the change till after-release
easier for everyoned and especially naddy
ok tedu
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optimization flags.
ok kettenis@ visa@
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ok millert@
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ok deraadt@
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- Target all four kinds of return bytes (c2, c3, ca, cb)
- Fix up instructions using both ModR/M and SIB bytes
- Force alignment before instructions with return bytes in immediates
- Force alignment before instructions that have return bytes in their encoding
- Add a command line switch to toggle the functionality.
ok deraadt@
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With fixes from mortimer@ (thanks!)
Tested by many, especially naddy@ (thanks!)
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ok deraadt@
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random cookies to protect access to function return instructions, with the
effect that the integrity of the return address is protected, and function
return instructions are harder to use in ROP gadgets.
On function entry the return address is combined with a per-function random
cookie and stored in the stack frame. The integrity of this value is verified
before function return, and if this check fails, the program aborts. In this way
RETGUARD is an improved stack protector, since the cookies are per-function. The
verification routine is constructed such that the binary space immediately
before each ret instruction is padded with int03 instructions, which makes these
return instructions difficult to use in ROP gadgets. In the kernel, this has the
effect of removing approximately 50% of total ROP gadgets, and 15% of unique
ROP gadgets compared to the 6.3 release kernel. Function epilogues are
essentially gadget free, leaving only the polymorphic gadgets that result from
jumping into the instruction stream partway through other instructions. Work to
remove these gadgets will continue through other mechanisms.
Remaining work includes adding this mechanism to assembly routines, which must
be done by hand. Many thanks to all those who helped test and provide feedback,
especially deaadt, tb, espie and naddy.
ok deraadt@
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patrick
gkoehler
mortimer
deraadt