Date: Wed, 10 Jul 2019 08:19:33 +0000 (UTC) From: Tijl Coosemans <tijl@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r349880 - head/sys/compat/linux Message-ID: <201907100819.x6A8JXHe020462@repo.freebsd.org>
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Author: tijl Date: Wed Jul 10 08:19:33 2019 New Revision: 349880 URL: https://svnweb.freebsd.org/changeset/base/349880 Log: Let linuxulator mprotect mask unsupported bits before calling kern_mprotect. After r349240 kern_mprotect returns EINVAL for unsupported bits in the prot argument. Linux rtld uses PROT_GROWSDOWN and PROT_GROWS_UP when marking the stack executable. Mask these bits like kern_mprotect used to do. For other unsupported bits EINVAL is returned like Linux does. Reviewed by: trasz, brooks MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D20864 Modified: head/sys/compat/linux/linux_mmap.c head/sys/compat/linux/linux_mmap.h Modified: head/sys/compat/linux/linux_mmap.c ============================================================================== --- head/sys/compat/linux/linux_mmap.c Wed Jul 10 08:08:14 2019 (r349879) +++ head/sys/compat/linux/linux_mmap.c Wed Jul 10 08:19:33 2019 (r349880) @@ -228,6 +228,11 @@ int linux_mprotect_common(struct thread *td, uintptr_t addr, size_t len, int prot) { + /* XXX Ignore PROT_GROWSDOWN and PROT_GROWSUP for now. */ + prot &= ~(LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP); + if ((prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0) + return (EINVAL); + #if defined(__amd64__) linux_fixup_prot(td, &prot); #endif Modified: head/sys/compat/linux/linux_mmap.h ============================================================================== --- head/sys/compat/linux/linux_mmap.h Wed Jul 10 08:08:14 2019 (r349879) +++ head/sys/compat/linux/linux_mmap.h Wed Jul 10 08:19:33 2019 (r349880) @@ -41,6 +41,8 @@ #define LINUX_MAP_ANON 0x0020 #define LINUX_MAP_GROWSDOWN 0x0100 +#define LINUX_PROT_GROWSDOWN 0x01000000 +#define LINUX_PROT_GROWSUP 0x02000000 int linux_mmap_common(struct thread *, uintptr_t, size_t, int, int, int, off_t);
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