From 4c184e70ad01289f89a9a780d154b00d6a86cccd Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Sat, 24 Sep 2022 13:45:00 +0200 Subject: linux-user/hppa: Allow PROT_GROWSUP and PROT_GROWSDOWN in mprotect() The hppa platform uses an upwards-growing stack and required in Linux kernels < 5.18 an executable stack for signal processing. For that some executables and libraries are marked to have an executable stack, for which glibc uses the mprotect() syscall to mark the stack like this: mprotect(xfa000000,4096,PROT_EXEC|PROT_READ|PROT_WRITE|PROT_GROWSUP). Currently qemu will return -TARGET_EINVAL for this syscall because of the checks in validate_prot_to_pageflags(), which doesn't allow the PROT_GROWSUP or PROT_GROWSDOWN flags and thus triggers this error in the guest: error while loading shared libraries: libc.so.6: cannot enable executable stack as shared object requires: Invalid argument Allow mprotect() to handle both flags and thus fix the guest. The glibc tst-execstack testcase can be used to reproduce the issue. Signed-off-by: Helge Deller Message-Id: <20220924114501.21767-7-deller@gmx.de> [lvivier: s/elif TARGET_HPPA/elif defined(TARGET_HPPA)/] Signed-off-by: Laurent Vivier --- linux-user/mmap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index e557f3626e..28f3bc85ed 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -106,6 +106,8 @@ static int validate_prot_to_pageflags(int *host_prot, int prot) page_flags |= PAGE_MTE; } } +#elif defined(TARGET_HPPA) + valid |= PROT_GROWSDOWN | PROT_GROWSUP; #endif return prot & ~valid ? 0 : page_flags; -- cgit v1.2.3-55-g7522