diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2021-04-06 10:40:20 -0700 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2021-04-12 11:06:24 +0100 |
| commit | eb42297a59e103500bdd2c352c5b52f54b1c33cd (patch) | |
| tree | af7603fdfa104013fc2ef405f69533c996c55df5 /accel/tcg | |
| parent | 017a913af4dff47ac5e62be613b9f8b88fc8fa96 (diff) | |
accel/tcg: Preserve PAGE_ANON when changing page permissions
Using mprotect() to change PROT_* does not change the MAP_ANON
previously set with mmap(). Our linux-user version of MTE only
works with MAP_ANON pages, so losing PAGE_ANON caused MTE to
stop working.
Reported-by: Stephen Long <steplong@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'accel/tcg')
| -rw-r--r-- | accel/tcg/translate-all.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index f32df8b240..ba6ab09790 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -2714,6 +2714,8 @@ void page_set_flags(target_ulong start, target_ulong end, int flags) a missing call to h2g_valid. */ assert(end - 1 <= GUEST_ADDR_MAX); assert(start < end); + /* Only set PAGE_ANON with new mappings. */ + assert(!(flags & PAGE_ANON) || (flags & PAGE_RESET)); assert_memory_lock(); start = start & TARGET_PAGE_MASK; @@ -2737,11 +2739,14 @@ void page_set_flags(target_ulong start, target_ulong end, int flags) p->first_tb) { tb_invalidate_phys_page(addr, 0); } - if (reset_target_data && p->target_data) { + if (reset_target_data) { g_free(p->target_data); p->target_data = NULL; + p->flags = flags; + } else { + /* Using mprotect on a page does not change MAP_ANON. */ + p->flags = (p->flags & PAGE_ANON) | flags; } - p->flags = flags; } } |