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mm: ignore MAP_EXECUTABLE in ksys_mmap_pgoff()

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Let's also remove masking off MAP_EXECUTABLE from ksys_mmap_pgoff(): the
last in-tree occurrence of MAP_EXECUTABLE is now in LEGACY_MAP_MASK, which
accepts the flag e.g., for MAP_SHARED_VALIDATE; however, the flag is
ignored throughout the kernel now.

Add a comment to LEGACY_MAP_MASK stating that MAP_EXECUTABLE is ignored.

Link: https://lkml.kernel.org/r/20210421093453.6904-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kevin Brodsky <Kevin.Brodsky@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2021-06-28 19:38:35 -07:00 committed by Linus Torvalds
parent a4eec6a3df
commit 3b8db39fad
3 changed files with 4 additions and 2 deletions
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2
include/linux/mman.h
View File

@ -31,6 +31,8 @@
/* /*
* The historical set of flags that all mmap implementations implicitly * The historical set of flags that all mmap implementations implicitly
* support when a ->mmap_validate() op is not provided in file_operations. * support when a ->mmap_validate() op is not provided in file_operations.
*
* MAP_EXECUTABLE is completely ignored throughout the kernel.
*/ */
#define LEGACY_MAP_MASK (MAP_SHARED \ #define LEGACY_MAP_MASK (MAP_SHARED \
| MAP_PRIVATE \ | MAP_PRIVATE \

2
mm/mmap.c
View File

@ -1633,7 +1633,7 @@ unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len,
return PTR_ERR(file); return PTR_ERR(file);
} }
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); flags &= ~MAP_DENYWRITE;
retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff); retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff);
out_fput: out_fput:

2
mm/nommu.c
View File

@ -1296,7 +1296,7 @@ unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len,
goto out; goto out;
} }
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); flags &= ~MAP_DENYWRITE;
retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff); retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff);