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wasi: avoid user-triggerable 0-sized allocations (#4452)

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might fix https://github.com/bytecodealliance/wasm-micro-runtime/issues/4451
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YAMAMOTO Takashi 2025-07-08 10:25:50 +09:00 committed by GitHub
parent 7d05dbc988
commit 0eceed2ba9
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1 changed files with 12 additions and 0 deletions
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12
core/iwasm/libraries/libc-wasi/libc_wasi_wrapper.c
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@ -375,6 +375,9 @@ wasi_fd_pread(wasm_exec_env_t exec_env, wasi_fd_t fd, iovec_app_t *iovec_app,
return (wasi_errno_t)-1;
total_size = sizeof(wasi_iovec_t) * (uint64)iovs_len;
if (total_size == 0) {
total_size = 1; /* avoid user-triggered 0-sized allocation */
}
if (total_size >= UINT32_MAX
|| !(iovec_begin = wasm_runtime_malloc((uint32)total_size)))
return (wasi_errno_t)-1;
@ -430,6 +433,9 @@ wasi_fd_pwrite(wasm_exec_env_t exec_env, wasi_fd_t fd,
return (wasi_errno_t)-1;
total_size = sizeof(wasi_ciovec_t) * (uint64)iovs_len;
if (total_size == 0) {
total_size = 1; /* avoid user-triggered 0-sized allocation */
}
if (total_size >= UINT32_MAX
|| !(ciovec_begin = wasm_runtime_malloc((uint32)total_size)))
return (wasi_errno_t)-1;
@ -484,6 +490,9 @@ wasi_fd_read(wasm_exec_env_t exec_env, wasi_fd_t fd,
return (wasi_errno_t)-1;
total_size = sizeof(wasi_iovec_t) * (uint64)iovs_len;
if (total_size == 0) {
total_size = 1; /* avoid user-triggered 0-sized allocation */
}
if (total_size >= UINT32_MAX
|| !(iovec_begin = wasm_runtime_malloc((uint32)total_size)))
return (wasi_errno_t)-1;
@ -654,6 +663,9 @@ wasi_fd_write(wasm_exec_env_t exec_env, wasi_fd_t fd,
return (wasi_errno_t)-1;
total_size = sizeof(wasi_ciovec_t) * (uint64)iovs_len;
if (total_size == 0) {
total_size = 1; /* avoid user-triggered 0-sized allocation */
}
if (total_size >= UINT32_MAX
|| !(ciovec_begin = wasm_runtime_malloc((uint32)total_size)))
return (wasi_errno_t)-1;