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linux-user: Allocate thunk size dynamically

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We store all struct types in an array of static size without ever
checking whether we overrun it. Of course some day someone (like me
in another, ancient ALSA enabling patch set) will run into the limit
without realizing it.

So let's make the allocation dynamic. We already know the number of
structs that we want to allocate, so we only need to pass the variable
into the respective piece of code.

Also, to ensure we don't accidently overwrite random memory, add some
asserts to sanity check whether a thunk is actually part of our array.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Alexander Graf 2015-05-06 23:47:32 +02:00 • committed by Riku Voipio
parent 0a2df857a7
commit 8be656b87c
3 changed files with 18 additions and 5 deletions
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4
include/exec/user/thunk.h
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@ -74,7 +74,7 @@ const argtype *thunk_convert(void *dst, const void *src,
const argtype *type_ptr, int to_host);
#ifndef NO_THUNK_TYPE_SIZE
extern StructEntry struct_entries[];
extern StructEntry *struct_entries;
int thunk_type_size_array(const argtype *type_ptr, int is_host);
int thunk_type_align_array(const argtype *type_ptr, int is_host);
@ -186,4 +186,6 @@ unsigned int target_to_host_bitmask(unsigned int x86_mask,
unsigned int host_to_target_bitmask(unsigned int alpha_mask,
const bitmask_transtbl * trans_tbl);
void thunk_init(unsigned int max_structs);
#endif