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Replace potentially unsafe strcpy() with bounds-checked memcpy()
and proper null termination in the _sysfs_get_dm_name() function.
This prevents buffer overflow vulnerabilities when copying device
mapper names from sysfs.
Also replace another strcpy() with _dm_strncpy() which also checks
whether copied string with into a given buffer in the function
_sysfs_get_kernel_name().
Changes:
- Replace strcpy(buf, temp_buf) with memcpy(buf, temp_buf, len) + buf[len] = '\0'
- Use stack-allocated buffers instead of malloc/dm_malloc for better performance
- Improve error handling logic for ENOENT vs other errors
- Add proper newline stripping with bounds checking
- Remove memory allocation failure paths and cleanup code
This addresses potential security issues identified by static analysis
tools while also improving performance by avoiding dynamic memory allocation.
While performing udev sync semaphore's inc/dec operation, we use the
result from GETVAL semctl just to print a debug message with current
value of that sempahore, nothing else.
If the GETVAL fails for whetever reason while the actual inc/dec
completes successfully, just log a warning message about the GETVAL
(and print the debug messages without the actual semaphore value)
and return success for the inc/dec operation as a whole.
Clean up udev sync semaphore on fail path during its creation, otherwise
the caller will have no handle returned to clean it up itself and the
semaphore will keep staying in the system. The only way to clean it up
would be to call `dmsetup udevcomplete_all` which would destroy all
udev sync semaphores, not just the failed one, which we don't want.
The same message is printed while performing create/inc/dec operation and
the GETVAL semctl fails. Add a prefix so we know exactly in which of
these functions the issue actually happened.
Kernels <2.6.27 don't have /sys/dev dir - add code for looking
out device name via longre seach in /sys/block
This makes commands like 'dmsetup dep -o blkdevname' working.
The device-mapper directory now holds a copy of libdm source. At
the moment this code is identical to libdm. Over time code will
migrate out to appropriate places (see doc/refactoring.txt).
The libdm directory still exists, and contains the source for the
libdevmapper shared library, which we will continue to ship (though
not neccessarily update).
All code using libdm should now use the version in device-mapper.
