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Rewrite Linux pledge() code so it can be a payload

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It's now possible to build our pledge() polyfill as a dynamic shared
object that can be injected into a glibc executable using LD_PRELOAD
This commit is contained in:
Justine Tunney 2022-08-08 11:41:08 -07:00
parent 7bd4179b9b
commit 0277d7d6e9
37 changed files with 1980 additions and 1600 deletions
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11
libc/calls/calls.mk
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@ -188,11 +188,20 @@ o/$(MODE)/libc/calls/_timespec_frommicros.o: \
OVERRIDE_CFLAGS += \
-O2
o/$(MODE)/libc/calls/pledge.o \
o/$(MODE)/libc/calls/pledge-linux.o \
o/$(MODE)/libc/calls/unveil.o: \
OVERRIDE_CFLAGS += \
-DSTACK_FRAME_UNLIMITED
# we want -Os because:
# it makes a big difference
# we need pic because:
# so it can be an LD_PRELOAD payload
o/$(MODE)/libc/calls/pledge-linux.o: \
OVERRIDE_CFLAGS += \
-Os \
-fPIC
LIBC_CALLS_LIBS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)))
LIBC_CALLS_SRCS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_SRCS))
LIBC_CALLS_HDRS = $(foreach x,$(LIBC_CALLS_ARTIFACTS),$($(x)_HDRS))