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mdbx: add paranoid assertions for off_t args of fcntl().

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Леонид Юрьев (Leonid Yuriev) 2022-04-18 20:01:52 +03:00
parent bb8f431817
commit 4628ac6863
1 changed files with 18 additions and 4 deletions
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22
src/lck-posix.c
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@ -175,14 +175,28 @@ __cold static void choice_fcntl() {
#ifndef OFF_T_MAX #ifndef OFF_T_MAX
#define OFF_T_MAX \ #define OFF_T_MAX \
((sizeof(off_t) > 4 ? INT64_MAX : INT32_MAX) & ~(size_t)0xffff) (((sizeof(off_t) > 4) ? INT64_MAX : INT32_MAX) & ~(size_t)0xffff)
#endif #endif
static int lck_op(mdbx_filehandle_t fd, int cmd, int lck, off_t offset, static int lck_op(const mdbx_filehandle_t fd, int cmd, const int lck,
off_t len) { const off_t offset, off_t len) {
mdbx_jitter4testing(true); mdbx_jitter4testing(true);
assert(offset >= 0 && len > 0);
assert((uint64_t)offset < (uint64_t)INT64_MAX &&
(uint64_t)len < (uint64_t)INT64_MAX &&
(uint64_t)(offset + len) > (uint64_t)offset);
assert((uint64_t)offset < (uint64_t)OFF_T_MAX &&
(uint64_t)len <= (uint64_t)OFF_T_MAX &&
(uint64_t)(offset + len) <= (uint64_t)OFF_T_MAX);
assert((uint64_t)((off_t)((uint64_t)offset + (uint64_t)len)) ==
((uint64_t)offset + (uint64_t)len));
for (;;) { for (;;) {
struct flock lock_op; struct flock lock_op;
STATIC_ASSERT(sizeof(off_t) <= sizeof(lock_op.l_start) &&
sizeof(off_t) <= sizeof(lock_op.l_len) &&
OFF_T_MAX == (off_t)OFF_T_MAX);
memset(&lock_op, 0, sizeof(lock_op)); memset(&lock_op, 0, sizeof(lock_op));
lock_op.l_type = lck; lock_op.l_type = lck;
lock_op.l_whence = SEEK_SET; lock_op.l_whence = SEEK_SET;
@ -218,7 +232,7 @@ static int lck_op(mdbx_filehandle_t fd, int cmd, int lck, off_t offset,
} }
#endif /* MDBX_USE_OFDLOCKS */ #endif /* MDBX_USE_OFDLOCKS */
if (rc != EINTR || cmd == op_setlkw) { if (rc != EINTR || cmd == op_setlkw) {
mdbx_assert(nullptr, MDBX_IS_ERROR(rc)); assert(MDBX_IS_ERROR(rc));
return rc; return rc;
} }
} }