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[PULL,13/13] linux-user: assert that target_mprotect cannot fail

Message ID 86abac06c142d20772b3f2e04c9bf02b7936a0b3.1443790691.git.riku.voipio@linaro.org
State New
Headers show

Commit Message

Riku Voipio Oct. 2, 2015, 1:01 p.m. UTC 
From: Paolo Bonzini <pbonzini@redhat.com>

All error conditions that target_mprotect checks are also checked
by target_mmap.  EACCESS cannot happen because we are just removing
PROT_WRITE.  ENOMEM should not happen because we are modifying a
whole VMA (and we have bigger problems anyway if it happens).

Fixes a Coverity false positive, where Coverity complains about
target_mprotect's return value being passed to tb_invalidate_phys_range.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
---
 linux-user/mmap.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
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Patch

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index b2126c7..5606bcd 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -514,10 +514,7 @@  abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
                 goto fail;
             if (!(prot & PROT_WRITE)) {
                 ret = target_mprotect(start, len, prot);
-                if (ret != 0) {
-                    start = ret;
-                    goto the_end;
-                }
+                assert(ret == 0);
             }
             goto the_end;
         }