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Prevent Valgrind Memcheck errors around px_acquire_system_randomness().

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This function uses uninitialized stack and heap buffers as supplementary
entropy sources.  Mark them so Memcheck will not complain.  Back-patch
to 9.4, where Valgrind Memcheck cooperation first appeared.

Marko Tiikkaja
This commit is contained in:
Noah Misch 2015-02-02 10:00:45 -05:00
parent 8b59672d8d
commit 59b919822a
1 changed files with 4 additions and 1 deletions
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5
contrib/pgcrypto/random.c
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@ -32,6 +32,7 @@
#include "postgres.h"
#include "px.h"
#include "utils/memdebug.h"
/* how many bytes to ask from system random provider */
#define RND_BYTES 32
@ -195,7 +196,7 @@ try_unix_std(uint8 *dst)
memcpy(dst, (uint8 *) &x, sizeof(x));
dst += sizeof(x);
/* let's be desperate */
/* hash of uninitialized stack and heap allocations */
res = px_find_digest("sha1", &md);
if (res >= 0)
{
@ -203,8 +204,10 @@ try_unix_std(uint8 *dst)
uint8 stack[8192];
int alloc = 32 * 1024;
VALGRIND_MAKE_MEM_DEFINED(stack, sizeof(stack));
px_md_update(md, stack, sizeof(stack));
ptr = px_alloc(alloc);
VALGRIND_MAKE_MEM_DEFINED(ptr, alloc);
px_md_update(md, ptr, alloc);
px_free(ptr);