diff options
Diffstat (limited to 'qga')
| -rw-r--r-- | qga/commands.c | 9 | ||||
| -rw-r--r-- | qga/qapi-schema.json | 6 |
2 files changed, 12 insertions, 3 deletions
diff --git a/qga/commands.c b/qga/commands.c index 5611117372..efc8b90281 100644 --- a/qga/commands.c +++ b/qga/commands.c @@ -11,6 +11,7 @@ */ #include "qemu/osdep.h" +#include "qemu/units.h" #include "guest-agent-core.h" #include "qga-qapi-commands.h" #include "qapi/error.h" @@ -24,6 +25,12 @@ #define GUEST_EXEC_MAX_OUTPUT (16*1024*1024) /* Allocation and I/O buffer for reading guest-exec out_data/err_data - 4KB */ #define GUEST_EXEC_IO_SIZE (4*1024) +/* + * Maximum file size to read - 48MB + * + * (48MB + Base64 3:4 overhead = JSON parser 64 MB limit) + */ +#define GUEST_FILE_READ_COUNT_MAX (48 * MiB) /* Note: in some situations, like with the fsfreeze, logging may be * temporarilly disabled. if it is necessary that a command be able @@ -560,7 +567,7 @@ GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count, } if (!has_count) { count = QGA_READ_COUNT_DEFAULT; - } else if (count < 0 || count >= UINT32_MAX) { + } else if (count < 0 || count > GUEST_FILE_READ_COUNT_MAX) { error_setg(errp, "value '%" PRId64 "' is invalid for argument count", count); return NULL; diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json index f6fcb59f34..4be9aad48e 100644 --- a/qga/qapi-schema.json +++ b/qga/qapi-schema.json @@ -266,11 +266,13 @@ ## # @guest-file-read: # -# Read from an open file in the guest. Data will be base64-encoded +# Read from an open file in the guest. Data will be base64-encoded. +# As this command is just for limited, ad-hoc debugging, such as log +# file access, the number of bytes to read is limited to 48 MB. # # @handle: filehandle returned by guest-file-open # -# @count: maximum number of bytes to read (default is 4KB) +# @count: maximum number of bytes to read (default is 4KB, maximum is 48MB) # # Returns: @GuestFileRead on success. # |