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Fix __minimal_malloc segfaults in __mmap due to stack-protector

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Starting with commit b05fae4d8e
"elf: Use the minimal malloc on tunables_strdup",
I get lots of segfaults in static tests on s390x when also using, e.g.:
export GLIBC_TUNABLES="glibc.elision.enable=1"

tunables_strdup callls __minimal_malloc which tries to call __mmap
due to insufficient space left. __mmap itself first setups a new
stack frame and segfaults when copying the stack-protector canary
from thread-pointer. The latter one is not yet setup.

Thus this patch also turns off stack-protection for mmap.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Stefan Liebler 2021-12-16 12:47:11 +01:00
parent ae23fa3e5f
commit ff3cb03f38
1 changed files with 4 additions and 0 deletions
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4
misc/Makefile
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@ -149,6 +149,10 @@ CFLAGS-sbrk.o = $(no-stack-protector)
CFLAGS-sbrk.op = $(no-stack-protector)
CFLAGS-brk.o = $(no-stack-protector)
CFLAGS-brk.op = $(no-stack-protector)
CFLAGS-mmap.o = $(no-stack-protector)
CFLAGS-mmap.op = $(no-stack-protector)
CFLAGS-mmap64.o = $(no-stack-protector)
CFLAGS-mmap64.op = $(no-stack-protector)
include ../Rules