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| author | Richard Henderson <richard.henderson@linaro.org> | 2020-05-19 11:56:45 -0700 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2020-08-23 16:57:58 +0200 |
| commit | 4eaa960dbcd3fbd51047eacbbc20a9882a0eca63 (patch) | |
| tree | c8acf9cb9083e51ded70b3e106a98acd94f18c57 /linux-user/mmap.c | |
| parent | 9dba3ca5af80a7d4b5269685ceaa27ca04199cf4 (diff) | |
| download | focaccia-qemu-4eaa960dbcd3fbd51047eacbbc20a9882a0eca63.tar.gz focaccia-qemu-4eaa960dbcd3fbd51047eacbbc20a9882a0eca63.zip | |
linux-user: Adjust guest page protection for the host
Executable guest pages are never directly executed by the host, but do need to be readable for translation. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-Id: <20200519185645.3915-3-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user/mmap.c')
| -rw-r--r-- | linux-user/mmap.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 46c7eeba9b..f261563420 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -76,8 +76,12 @@ static int validate_prot_to_pageflags(int *host_prot, int prot) * don't bother transforming guest bit to host bit. Any other * target-specific prot bits will not be understood by the host * and will need to be encoded into page_flags for qemu emulation. + * + * Pages that are executable by the guest will never be executed + * by the host, but the host will need to be able to read them. */ - *host_prot = prot & (PROT_READ | PROT_WRITE | PROT_EXEC); + *host_prot = (prot & (PROT_READ | PROT_WRITE)) + | (prot & PROT_EXEC ? PROT_READ : 0); return prot & ~valid ? 0 : page_flags; } |